Janardhan Padmanabhan, FNA                                                                              
INSA Senior Scientist
Physical Research Laboratory
Ahmedabad - 380 009
INDIA

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<aurora>

A display of the "Northern Lights" or Aurora Borealis.

























<Thaltej-Dipole-Array>

A view of the 20,000 m2 dipole array at Thaltej, Ahmedabad, that was operated by PRL and used for IPS observations of the solar wind at 103 MHz.

Click on the picture for a full size image of the array.
 
 

<elec-button>  Research Publications (1989  − Present):



    1989−1990:



  1. Quasar Enhanced.
    Alurkar, S.K., Sharma, A.K., Janardhan, P ., and Bhonsle, R.V. (1989). Nature, 338, 211−212.

  2. Three-Site Solar Wind Observatory.
    Alurkar, S.K.,Bobra, A.D., Nirman, N.S., Venat, P., and Janardhan, P. (1989). Ind. Jou. Pure and Appl. Phys., 27, 322−330.

  3. Interplanetary Scintillation Network for 3-Dimensional Space Exploration in India.
    Bhonsle, R.V., Alurkar, S.K., Bobra, A.D., Lali, K.S., Nirman, N.S., Venat, P., Sharma, A.K. and Janardhan, P. (1990). Acta Astronautica, 21, No. 3, 189−196.



    1991 - 1995:



  4. Estimation of electron density in the ion-tail of comet Halley using 103 MHz IPS observations.
    Sharma, A. K., Alurkar, S. K. and Janardhan, P. (1991). Bull. Astr. Soc. India, 19, 82.

  5. Enhanced scintillation of radio source 2204+29 by comet Austin (1989c1) at 103 MHz.
    Janardhan, P., Alurkar, S. K., Bobra, A. D., Slee, O. B. (1991). Bull. Astr. Soc. India, 19, 204.

  6. Enhanced Radio Source Scintillation Due to Comet Austin(1989 c1).
    Janardhan, P., Alurkar, S.K.,Bobra, A.D. and Slee, O.B. (1991). Aus. Jou. Phys., 44, 565−571.

  7. Power Spectral Analysis of Enhanced Scintillation of Quasar 3C459 Due to Comet Halley.
    Janardhan, P., Alurkar, S.K.,Bobra, A.D., Slee, O.B. and Waldron, D. (1992). Aust. J. of Phys., 45, No. 1, 115.

  8. Possible Contribution of a Solar Transient to Enhanced Scintillation Due to a Quasar.
    Janardhan, P. and Alurkar, S.K. (1992). Earth, Moon, and Planets, 58, 31−38.

  9. Comparison of Single-Site Interplanetary Scintillation Solar Wind Speed Structure With Coronal Features.
    Alurkar, S.K., Janardhan, P. and Vats, H.O. (1993). Sol. Phys., 144, No.2, 385−397.

  10. Angular Source Size Measurements and Interstellar Scattering at 103 MHz Using Interplanetary Scintillation.
    Janardhan, P. and Alurkar, S.K. (1993). Astronomy & Astrophys ., 269, 119−127.

  11. Measurements of Compact Radio Source Size and Structure of Cometary Ion Tails Using Interplanetary Scintillation at 103 MHz.
    Janardhan, P. (1993). Bull. Astr. Soc. India, 21, 381.

  12. IPS Survey at 327 MHz for Detection of Compact Radio Sources.
    Balasubramanian, V., Janardhan, P ., Ananthakrishnan, S., and Manoharan, P.K. (1993). Bull. Astr. Soc. India, 21, 469−471.

  13. Observations of PSR 0950+08 at 103 MHz.
    Deshpande, M.R., Vats, H.O., Janardhan, P ., and Bobra, A.D. (1993). Bull. Astr. Soc. India, 21, 613−614.

  14. Terrestrial Effects of PSR 0950+08.
    Vats, H.O., Deshpande, M.R., Janardhan, P ., Harish, C., and Vyas, G.D. (1993). Bull. Astr. Soc. India , 21, 615−617.

  15. Radio and X-ray burst from PSR 0950+08.
    Deshpande, M.R., Vats, H.O., Chandra Harish, Janardhan, P., Bobra, A.D. and, Vyas, G.D. (1994). Astrophys. Space Sci., 218, No.2, 249−265.

  16. Latitudinal Variation of Solar Wind Velocity.
    Ananthakrishnan, S., Balasubramanian, V., and Janardhan, P. (1995). Space Sci. Rev ., 72, 229−232.

  17. A 327-MHZ Interplanetary Scintillation Survey Of Radio Sources Over 6-Steradian.
    Balasubramanian, V., Janardhan, P . and Ananthakrishnan, S. (1995). Jou. Astrophys. & Astron., 16, 298.

  18. Unique Observations of PSR 0950+08 and Possible Terrestrial Effects.
    M.R. Deshpande, H.O. Vats, P. Janardhan, A.D. Bobra, Harish Chandra, and G.D.Vyas. (1995). Jou. Astrophys. & Astron ., 16, 253.



    1996 - 2000:



  19. Simultaneous Observations of Large Enhancement In the Flux of PSR 0950+08 Over a 200 KM Baseline at 103 MHz.
    Bobra, A. D., Chandra, H., Vats, H. O., Janardhan, P., Vyas, G. D., Deshpande, M. R., (1996). Proc. of the 160th IAU Colloquium− ASP Conf. Series.,  pp. 477−448.
    Eds.  S. Johnston, M.A. Walker and M. Bailes.

  20. On the Nature of Compact Components of Radio Sources at 327 MHz.
    Balasubramanian, V., Janardhan, P., Ananthakrishnan, S. and Srivatsan, R. (1996). Bull. Astr. Soc. India, 24, 829.

  21. IPS Observations of the Solar Wind at 327 MHz - A Comparison with Ulysses Observations.
    Janardhan, P ., Balasubramanian, V., Ananthakrishnan, S. and Srivatsan, R. (1996). Bull. Astr. Soc. India , 24, 645.

  22. Travelling Interplanetary Disturbances Detected Using Interplanetary Scintillation at 327 MHz.
    Janardhan, P., Balasubramanian, V., Ananthakrishnan, S., Dryer, M., Bhatnagar, A. and McIntosh, P.S. (1996). Sol. Phys., 166, 379−401.

  23. Tracking Interplanetary Disturbances Using Interplanetary Scintillation.
    Janardhan, P., Balasubramanian, V. and Ananthakrishnan, S. (1997). Proc. 31st. ESLAB Symp., ESA SP−415 , pp. 177−181.

  24. Radio Detection of Ammonia in Comet Hale−Bopp.
    Bird, M. K., Huchtmeier, W., Gensheimer, P., Wilson, T. L., Janardhan, P. and Lemme, C. (1997). A&A Lett., 325, L5−L8.

  25. Ammonia in Comet Hale-Bopp.
    Wilson, T. L., Huchtmeier, W. K., Bird, M. K., Janardhan, P., Gensheimer, P. and Lemme, C., (1997). Bulletin of the American Astronomical Soc., 29, 1259.

  26. Detection and Tracking of IPS Disturbances Using Interplanetary Scintillation.
    Balasubramanian, V., Srivatsan, R., Janardhan, P., and Ananthakrishnan, S. (1998). Bull. Astr. Soc. India, 26, 225−229.

  27. Radio Observations of Transient Solar Wind Flows.
    Balasubramanian, V., Janardhan, P., Srivatsan, R. and Ananthakrishnan, S. (1998). Proc. of the 3rd. SOLTIP Symposium, pp. 319.
    Eds.  Feng, X.S., Wei, F.S., and Dryer, M.

  28. Coronal Velocity Measurements with Ulysses: Multi−link Correlation Studies During two Superior Conjunctions.
    Janardhan, P., Bird, M K., Edenhofer, P, Plettemeier, D., Wohlmuth, R., Asmar, S W., Patzölt, M. and Karl, J. (1999). Sol. Phys., 184, 157−172.

  29. K−Band Detection of Ammonia and (Possibly) Water in Comet Hale−Bopp.
    Bird, M. K., Janardhan, P., Wilson, T. L., Huchtmeier, W., Gensheimer, P., and Lemme, C. (1997). Earth Moon and Planets, 78, 21−28.

  30. Study of Solar Wind Transients Using IPS.
    Ananthakrishnan, S., Kojima, M., Tokumaru, M., Balasubramanian, V., Janardhan, P., Manoharan, P.K., and Dryer, M. (1999). Proc. of Solar Wind 9 Conference, AIP, New York. pp 321.
    Eds.  S. R. Habbal

  31. Anisotropic Structure of the Solar Wind in its Region of Acceleration.
    Efimov, A.I., Rudash, V.K., Bird, M.K., Janardhan, P., Patzölt, M., Karl, J., Edenhofer, P. and Wohlmuth, R. (2000). Advances in Space Res., 26, 785−788.

  32. Radio Detection of a Rapid Disturbance Launched by a Solar Flare.
    White, S.M., Janardhan, P. and Kundu, M.R. (2000). ApJ Lett., 533 , L167−L170.

  33. Observations of Interplanetary Scintillation During the 1998 Whole Sun Month: A Comparison between EISCAT, ORT and Nagoya Data.
    Moran, P.J., Breen, A.R., Canals, A., Markkanen, J., Janardhan, P., Tokumaru, M. and Williams, P.J.S. (2000). Annales Geophysica, 18, 1003.

  34. H−alpha Observations of Be Stars.
    Banerjee, D.P.K., Rawat, S.D. and Janardhan, P. (2000). A&A Suppl., 147, 229.



    2001 − 2005:



  35. Near Infra−red and Optical Spectroscopy of Delta Scorpii.
    Banerjee, D.P.K., Janardhan, P. and Ashok, N.M. (2001). A&A Lett., 380, L13.

  36. Flow Sources and Formation Laws of Solar Wind Streams.
    Lotova, N.A., Obridko, V.N., Vladimirskii, K.V., Bird, M.K. and Janardhan, P. (2002). Sol. Phys., 205, 149.

  37. Fine Structure of the Solar Wind Turbulence Inferred from Simultaneous Radio Occultation Observations at Widely−Spaced Ground Stations.
    Bird, M.K., Janardhan, P., Efimov, A.I., Samoznaev, L.N., Andreev, V.E., Chashei, I.V., Edenhofer, P., Plettemeier, D., and Wohlmuth, R. (2003). Solar Wind 10, AIP Conf. Proc. 679, 465−468. AIP Press, Melville, New York, USA.
    Eds.  M. Velli et al.

  38. IPS Observations of the Solar Wind Disappearance Event of May 1999.
    Balasubramanian, V., Janardhan, P., Srinivasan, S., and Ananthakrishnan, S. (2003). Jou. Geophys. Res. 108, A3, 1121.

  39. Giant Meter Wave Radio telescope Observations of an M2.8 Flare: Insights into the Initiation of a Flare−Coronal Mass Ejection Event.
    Prasad Subramanian, Ananthakrishnan, S., Janardhan, P. , Kundu, M.R., White, S.M., Garaimov, V.I. (2003). Sol. Phys. 218, 247−259.

  40. The Solar Wind and Interplanetary Disturbances.
    Janardhan, P., (2003). Solar Terrestrial Environment  − Space Weather, Allied Publishers, New Delhi., pp. 42−56.
    Eds.     R.P.Singh, Rajesh Singh & Ashok Kumar, Banaras Hindu University, Varanasi, India.
    ISBN:  81−7764−494−7.

  41. Radio Observations of Rapid Acceleration in a Slow Filament Eruption/Fast CME Event.
    Kundu, M.R., Garaimov, V.I., White, S.M., Manoharan, P.K., Subramanian, S., Ananthakrishnan, S., and Janardhan, P. (2004). Ap J. 607, 530−539.

  42. Resolving the Enigmatic Solar Wind Disappearance Event of 11 May 1999.
    Janardhan, P. , Fujiki, K., Kojima, M., Tokumaru, M., and Hakamada, K. (2005). Jou. Geophys. Res.110, A08101.



    2006 − 2010:



  43. Combining visibilities from the Giant Meterwave Radio Telescope and the Nancay Radio Heliograph.
    Mercier, C., Prasad Subramanian, Kerdraon, A., Pick, M., Ananthakrishnan, S. and Janardhan, P. (2006). A&A. 447, 1189−1201.

  44. The Morphology of Decimetric Emission from Solar Flares: GMRT Observations.
    Kundu, M.R., White, S.M., Garaimov, V.I., Subramanian, S., Ananthakrishnan, S., and Janardhan, P. (2006). Sol. Phys. 236, 369−387.

  45. Enigmatic solar wind disappearance events: Do we understand them?.
    Janardhan, P., (2006). Jou. Astrophys. Astron. 27, 1−7.

  46. Locating the solar source of the extremely low−density, low−velocity solar wind flows of 11 May 1999.
    Janardhan, P., Fujiki, K., Kojima, M. and Tokumaru, M. (2007). Proc. of the ILWS Workshop 2006, p.132−138.
    Eds.    N. Gopalswamy and A. Bhattacharya
    ISBN:  81−87099−40−2

  47. Insights gained from Ground and Space Based Studies of Long Lasting Low Density Anomalies at 1 AU.
    Janardhan, P. , Ananthakrishnan, S., Balasubramanian, V., (2007). Asian Jou. Phys., 16, 209−232.
    Eds.   Janardhan, P., Vats, H.O., Iyer, K.N., & Anandarao, B.G.

  48. Prospects for GMRT to Observe Radio Waves from UHE Particles Interacting with the Moon.
    Sukanta P., Mohanty, S., Janardhan, P. , and Oscar, S., (2007). JCAP., 11, 022−038.

  49. The Source Regions of Solar Wind Disappearance Events.
    Janardhan, P. , Fujiki, K., Sawant, H.S., Kojima, M., Hakamada, K. and Krishnan, R., (2008). Jou. Geophys. Res. 113, A03102.

  50. The Solar Wind Disappearance Event of 11 May 1999: Source Region Evolution.
    Janardhan, P. , Tripathi, D., and Mason, H. (2008). A&A Lett.  488, L1−L4.

  51. Solar Polar Fields During Cycles 21 - 23: Correlation with Meridional Flows.
    Janardhan, P., Susanta Kumar Bisoi and Gosain, S., (2010).  Sol. Phys. 267, 267−277.

  52. Unique Observations of Geomagnetic SI+ - SI- pair and Solar Wind Fluctuations.
    Rastogi, R.G., Janardhan, P., Ahmed, K., Das, A.C. and Susanta Kumar Bisoi (2010).  Jou. Geophys. Res. 115, A12110, doi:10.1029/2010JA015708.




    2011 − 2015:



  53. The Prelude to the Deep Minimum between Solar Cycles 23 and 24: Interplanetary Scintillation Signatures in the Inner Heliosphere
    Janardhan, P., Susanta Kumar Bisoi, Ananthakrishnan, S., Tokumaru, M., Fujiki, K., (2011).  Geophys. Res. Lett., 38,  L20108, doi:10.1029/2011GL049227.

  54. Deep GMRT 150 MHz observations of the DEEP2 fields: Searching for High Red-shift Radio Galaxies Revisited
    Susanta Kumar Bisoi., Ishwara-Chandra, C.H., Sirothia, S.K., and Janardhan, P. (2011).  Jou. Astrophys. Astr. 32, 613−614.  DOI: 10.1007/s12036-011-9116-2.

  55. Near-Infrared Monitoring and Modelling of V1647 Ori in its On-going 2008-12 Outburst Phase
    Venkata Raman, V., Anandarao, B.G., Janardhan, P. and Pandey, R.  (2013).  Res. Astron. Astrophys. 13, No. 9, 1107−1117. 

  56. Peculiar behavior of solar polar fields during solar cycles 21-23: Correlation with meridional flow speed
    Susanta Kumar Bisoi, Janardhan,P., (2013).  Proc. IAU Symp. 294,  8, 81−82  (DOI) 10.1017/S1743921313002287.

  57. Asymmetry in the periodicities of solar photospheric fields: A probe to the unusual solar minimum prior to cycle 24
    Susanta Kumar Bisoi, Janardhan,P., (2013).  Proc. IAU Symp. 294,  8, 85−86  DOI: 10.1017/S1743921313002305.

  58. Interplanetary scintillation signatures in the inner heliosphere of the deepest solar minimum in the past 100 years
    Susanta Kumar Bisoi, Janardhan,P., (2013).  Proc. IAU Symp. 294,  8, 83−84  DOI: 10.1017/S1743921313002299.

  59. Observations of a geomagnetic SI+−SI- pair and associated solar wind fluctuations
    Susanta Kumar Bisoi, Janardhan,P., (2013).  Proc. IAU Symp. 294,  8, 543−544  DOI: 10.1017/S1743921313003141.

  60. Changes in quasi-periodic variations of solar photospheric fields: precursor to the deep solar minimum in the cycle 23?
    Susanta Kumar Bisoi, Janardhan,P., Chakrabarty, D., Ananthakrishnan, S. and Divekar,A. (2014).  Sol. Phys.  289, 41−61.  DOI:  10.1007/s11207-013-0335-3.

  61. Spread-F during the magnetic storm of 22 January 2004 at low latitudes: Effect of IMF-Bz in relation to local sunset time
    Rastogi,R.G., Chandra, H., Janardhan,P., Thai Lan Hoang, Louis Condori, Pant, T.K., Prasad, D.S.V.V.D. and Reinish, B.W. (2014).   Jou. Earth System Sci.  123, 1273−1285. 

  62. Determination of mass and orbital parameters of a low-mass star HD 213597B
    Priyanka Chaturvedi1, Rohit Deshpande, Vaibhav Dixit, Arpita Roy Abhijit Chakraborty, Suvrath Mahadevan, B.G. Anandarao, Leslie Hebb and P. Janardhan (2014). 
    MNRAS      442,3737−3744, DOI: 10.1093/mnras/stul127.

  63. A study of density modulation index in the inner solar wind during solar cycle 23
    Susanta Kumar Bisoi, P. Janardhan, M. Ingale and P. Subramanian, and S. Ananthakrishnan  (2014).  Atrophysical Journal  795, 69−76.

  64. Equatorial and mid-latitude ionospheric currents over the Indian region based on 40 years of data at Trivandrum and Alibag
    Rastogi,R.G., Chandra, H., Janardhan, P., and Rahul Shah  (2014).  IJRSP  43, 274−283.

  65. The Structure of Solar Radio Noise Storms.
    C. Mercier, Prasad Subramanian, G. Chambe, Janardhan, P., (2015).  A&A. 576, A136

  66. A Twenty Year Decline in Solar Photospheric Magnetic Fields: Inner-Heliospheric Signatures and Possible Implications?
    P. Janardhan, Susanta Kumar Bisoi, S. Ananthakrishnan, Tokumaru, M., and Fujiki, K., Jose, L., and Sridharan, R.  (2015).  Jou. Geophys. Res. 120, 5306--5317, doi:10.1002/2015JA021123.

  67. Solar and Interplanetary Signatures of a Maunder-like Grand Solar Minimum around the Corner - Implications to Near-Earth Space
    P. Janardhan, Susanta Kumar Bisoi, S. Ananthakrishnan, R. Sridharan and L. Jose  (2015).  Sun and Geosphere  10, No. 2, 147--156.



    2016 − 2020:



  68. A Prolonged Southward IMF-Bz Event of May 02 -- 04, 1998: Solar, Interplanetary Causes and Geomagnetic Consequences
    Susanta Kumar Bisoi, Chakrabarty,D., Janardhan, P., Rastogi, R.G., Yoshikawa, A., Fujiki, K., Tokumaru, M., and Yan, Y. (2016). Jou. Geophys. Res. 121, 3882 -- 3904, DOI:10.1002/2015JA022185.

  69. J1216+0709 : A Radio Galaxy with Three Episodes of AGN Jet Activity
    Veeresh Singh, Ishwara-Chandra, C.H., Preeti Kharb, Shweta Srivastava Janardhan, P., (2016). ApJ   826, 132--137, DOI:10.3847/0004-637X/826/2/132.

  70. Star formation activity in the neighbourhood of WR 1503-160L star in the mid-infrared bubble N46
    Dewangan, L.K., Baug, T., Ojha, D.K.,Janardhan,P. Ninan, J. P., Luna, A. and Zinchenko, I. (2016). ApJ   826, 27--55, DOI: 10.3847/0004-637X/826/1/27.

  71. Multi-directional measurements of high energy particles from the Sun-Earth L1 point with STEPS.
    S.K. Goyal, M.Shanmugama, A. R. Patela, T. Ladiyaa, Neeraj K. Tiwaria, S. B. Banerjeea, S. V.Vadawalea, P. Janardhan, D. Chakrabartya,
    R. Srinivas, P. Shuklab, P. Kumara, K. P.Subramaniana, B. Bapat, and P. R. Adhyarua (2016)    . Proc. SPIE   9905, DOI: 10.1117/12.2232259.

  72. Amplitude of solar wind density turbulence from 10 Rs - 45 Rs
    K. Sasikumar Raja, Madhusudan Ingale, R. Ramesh, Prasad Subramanian, P. K., Manoharan and P. Janardhan. (2016). Jou. Geophys. Res 121, A10, DOI: 10.1002/2016JA023254.

  73. A 20 year decline in solar magnetic fields and solar wind micro-turbulence levels: Are we heading towards a Maunder-like minimum?
    Janardhan, P., Bisoi, S. K., and Ananthakrishnan, S. (2016). Proc. URSI-APRASC-2016 pp: 1079--1082.

  74. The physical environment around IRAS 17599-2148: Infrared dark cloud and bipolar nebula
    Dewangan, L.K., Ojha, D.K., Zinchenko, Janardhan, P., Ghosh, S.K. and Luna, A. (2016). ApJ   833, DOI: 10.3847/1538-4357/833/2/246.

  75. Multi-wavelength study of the star-formation in the S237 HII Region
    Dewangan, L.K., Ojha, D.K., Zinchenko, Janardhan,P. and Luna, A. (2017). ApJ 834, DOI: 10.3847/1538-4357/834/1/22.

  76. Solar wind flow angle and geo-effectiveness of corotating interaction regions: First results
    Diptiranjan Rout, Chakrabarty, D., Janardhan, P., Sekar, R., Vrunda Maniya and Kuldeep Pandey (2017).  Geophys. Res. Lett. 44, 4532-4539  DOI: 10.1002/2017GL073038.

  77. Probing the heliosphere using in-situ payloads on-board Aditya-L1
    Janardhan, P., Santosh Vadawale, Bhas Bapat, Subramanian, K. P., Chakrabarty D., Prashant Kumar, Aveek Sarkar, Nandita Srivastava, Satheesh Thampi R., Vipin K. Yadav,
    Dhanya M. B., Govind G. Nampoothiri, Abhishek J. K., Anil Bhardwaj and Subhalakshmi K. (2017).      Current Science 113,  No. 4, 620-624, DOI: 10.18520/cs/v113/i04/620-624 .

  78. An Infrared Photometric and Spectroscopic Study of Post-AGB Stars
    Venkata Raman, V., Anandarao, B. G., Janardhan, P., and Pandey, R. (2017).  MNRAS 470, 1593-1611.  DOI:10.1093/mnras/stx1237.

  79. Post sunset equatorial spread-F at Kwajalein and interplanetary magnetic field
    Rastogi, R.G., Chandra, H., Janardhan, P., Reinisch, B.W. and Susanta Kumar Bisoi (2017).  Jou. Adv. Space Res. 60, 1708-1715.

  80. The molecular cloud S242: Physical environment and star formation activities
    Dewangan, L.K., Baug, T., Ojha, D.K., Janardhan, P., Devraj, R., and Luna, A., (2017).  ApJ  845, 34-47.

  81. Effect of Solar Flare on the Equatorial Electrojet in the Eastern Brazil Region
    Rastogi, R.G., Janardhan, P., Chandra, H., Trivedi, N.B., and Vidal Erick, (2017).  JESS 126, 51. DOI:10.1007/s12040-017-0837-8 .

  82. Aditya Solarwind Particle EXperiment (ASPEX) onboard the Aditya-L1 Mission
    S. K. Goyal, P. Kumar Janardhan, P., S. V. Vadawale, A. Sarkar, M. Shanmugam, K. P. Subramanian, B. Bapat, D. Chakrabarty,P. R. Adhyaru, A. R. Patel, S. B. Banerjee,
    Manan S. Shah, Neeraj K. Tiwari, H. L. Adalja, T. Ladiya, M. B. Dadhania, A. Sarda, A. K. Hait, M. Chauhan and R. R. Bhavsar (2018).      Planetary Space Sci.  163,42-55.

  83. Decimetric emission 500" away from a flaring site: possible scenarios from GMRT solar radio observations
    Susanta Kumar Bisoi., Sawant, H.S., Janardhan, P., Yan, Y., Chen, L., Arun Kumar Awasthi., Shweta Srivastava and Gao, G. (2018). ApJ    862, 65-79.

  84. Solar Cycle 24: An Unusual Polar Field Reversal
    Janardhan, P., Fujiki, K., Ingale, M., Susanta Kumar Bisoi and Diptiranjan Rout (2018). A&A   618, A148.

  85. Long term trends in solar photospheric fields and solar wind turbulence levels: Implications to the near-Earth space
    Janardhan, P., Fujiki, K., Ingale, M., Susanta Kumar Bisoi and Diptiranjan Rout (2018). Proc. IAU Symp 340 , 121-124.,  DOI:10.1017/S1743921318001710
    D. Banerjee, J. Jiang, K. Kusano & S. Solanki, eds.    

  86. Beyond the mini-solar maximum of solar cycle 24: Declining solar magnetic fields and the response of the terrestrial magnetosphere
    Ingale, M., Janardhan, P., and Susanta Kumar Bisoi. (2019). JGR, 124, DOI:10.1029/2019JA026616

  87. Global solar magnetic field and interplanetary scintillations during the past four solar cycles
    Sasikumar Raja., Janardhan, P., Susanta Kumar Bisoi, Ingale, M., Prasad Subramanian, Fujiki, K., and Maksimovic, M. (2019). Sol. Phys., 294, 123-136, DOI: 10.1007/s11207-019-1514-7

  88. Infrared attenuation due to phase change from amorphous to crystalline observed in astrochemical propargyl ether ices.
    Rahul, K.K., Meka,J.K., Pavithraa,S., Gorai, P., Das, A., Lo, J.-I., Rajasekhar, B.N., Cheng, B.-M., Janardhan, P., Bhardwaj, A., Mason, N.J., and Sivaraman, B. (2020). Spectrochemica Acta,224, DOI: 10.1016/j.saa.2019.117393

  89. Residue from vacuum ultraviolet irradiation of benzene ices: Insights into the physical structure of astrophysical dust
    Rahul, K.K., Shiva, K., Meka,J.K., Das, A., Vijayanand, C., Rajasekhar, B.N., Lo, J.-I., Cheng, B.-M., Janardhan, P., Bhardwaj, A., Mason, N.J., and Sivaraman, B. (2020). Spectrochemica Acta,   DOI:10.1016/j.saa.2019.117797.  
    Also appeared on the cover page of ASTROPAH Newsletter AstroPAH #65 downloadable here     “Picture of the Month”

  90. Another Mini Solar Maximum in the Offing: A Prediction for the Amplitude of Solar Cycle 25
    Susanta Kumar Bisoi., Janardhan, P. and Ananthakrishnan, S. (2019). JGR, 125,  DOI:2019JA027508.

  91. A New Tool for Predicting the Solar Cycle: Correlation between Flux Transport at the Equator and the Poles
    Susanta Kumar Bisoi., and Janardhan, P., (2020). Sol. Phys.  DOI:10.1007/s11207-020-01645-9

  92. Solar X-Ray Monitor on Board the Chandrayaan-2 Orbiter: In-Flight Performance and Science Prospects
    N.P.S. Mithun, Santosh V, Aveek Sarkar, M. Shanmugam, Arpit R. Patel, Biswajit Mondal, Bhuwan Joshi, P. Janardhan, Hiteshkumar L. Adalja,Shiv Kumar Goyal, Tinkal Ladiya, Neeraj Kumar Tiwari, Nishant Singh, Sushil Kumar, Manoj K. Tiwari, M.H. Modi, Anil Bhardwaj. (2020), Sol. Phys., 295, Issue 10, DOI:10.1007/s11207-020-01712-1



    2021 − Present:



  93. Ground Calibration of Solar X-ray Monitor On Board the Chandrayaan-2 Orbiter
    N. P. S. Mithun, Santosh V. Vadawale, M. Shanmugam , Arpit R. Patel, Neeraj Kumar, Tiwari, Hiteshkumar L. Adalja, Shiv Kumar Goyal, Tinkal Ladiya, Nishant Singh, Sushil, Kumar, Manoj K. Tiwari, M. H. Modi, Biswajit Mondal, Aveek Sarkar, Bhuwan Joshi, P. Janardhan, Anil Bhardwaj. (2021). Expt. Astronomy 51, 33-60,DOI:10.1007/s10686-020-09686-5.

  94. Observations of the Quiet Sun During the Deepest Solar Minimum of the Past Century with Chandrayaan-2 XSM - Elemental Abundances in the Quiescent Corona
    Santosh V., Biswajit Mondal, N. P. S. Mithun, Aveek Sarkar, Janardhan, P., Bhuwan Joshi , Anil Bhardwaj, M. Shanmugam, Arpit R. Patel, Hitesh Kumar L. Adalja, Shiv Kumar Goyal , Tinkal Ladiya, Neeraj Kumar Tiwari, Nishant Singh, and Sushil Kumar. (2021).   ApJ. Lett., 912., L12, DOI:10.3847/2041-8213/abf35d.

  95. Observations of the Quiet Sun During the Deepest Solar Minimum of the Past Century with Chandrayaan-2 XSM - Sub-A Class Microflares Outside Active Regions
    Santosh V., N. P. S. Mithun, Biswajit Mondal, Aveek Sarkar, Janardhan, P., Bhuwan Joshi, Anil Bhardwaj, M. Shanmugam, Arpit R. Patel, Hitesh Kumar L. Adalja, Shiv Kumar Goyal, Tinkal Ladiya, Neeraj Kumar Tiwari, Nishant Singh, and Sushil Kumar. (2021). ApJ. Lett., 912, L13, DOI:10.3847/2041-8213/abf0b0.

  96. Evolution of Elemental Abundances During B-Class Solar Flares: Soft X-ray Spectral Measurements with Chandrayaan-2 XSM
    Biswajit Mondal, Aveek Sarkar, Santosh V. Vadawale, N. P. S. Mithun, Janardhan, P ., Giulio Del Zanna, Helen E. Mason, Urmila Mitra-Kraev, and Shyama Narendranath K C (2021). ApJ., 920, 4, DOI:10.3847/1538-4357/ac14c1

  97. Multiwavelength Observations by XSM, Hinode, and SDO of an Active Region. Chemical Abundances and Temperatures
    G. Del Zanna, B. Mondal, Y. K. Rao, N. P. S. Mithun, S. V. Vadawale, K. K. Reeves, H. E. Mason, A. Sarkar, P. Janardhan , and A. Bhardwaj. (2022). ApJ, 934, 159, DOI:10.3847/1538-4357/ac7a9a

  98. Shock Induced Transformation of Non-Magnetic to Magnetic ISM Dust Analogue
    Arijit Roy, V. S. Surendra, J. K. Meka, R. Ramachandran, D. Sahu, A. Goutam, T. Vijay, V. Jayaram, P. Janardhan , B. N. Rajasekhar, Anil Bhardwaj, N. J. Mason, and B. Sivaraman. (2022). MNRAS, 517, 4845 – 4855, DOI:10.1093/mnras/stac2637

  99. Shock Processing of Amorphous Carbon Nanodust
    Arijit Roy, V.S. Surendra, M. Ambresh, D. Sahu, J.K. Meka, R. Ramachandran, P. Samarth, S. Pavithraa, V. Jayaram, H. Hill, J. Cami, B.N. Rajasekhar, P. Janardhan , Anil Bhardwaj, N.J. Mason, B. Sivaraman. (2022). JASR, 16047, DOI:10.1016/j.asr.2022.06.068

  100. Soft X-ray Spectral Diagnostics of Multi-thermal Plasma in Solar Flares with Chandrayaan-2 XSM
    N. P. S. Mithun, Santosh V. Vadawale, Giulio Del Zanna, Yamini K. Rao, Bhuwan Joshi, Aveek Sarkar, Biswajit Mondal, P. Janardhan , Anil Bhardwaj, and Helen E. Mason. (2022). ApJ ., 939, 112, DOI:10.3847/1538-4357/ac98b4

  101. N-Graphene Synthesized in Astrochemical Ices
    Shivaraman B, Rahul K K, Ambresh M, Sahu D, Meka J K, Chou S-L, Wu Y-J, Gupta D, Das A, Lo J-I, Cheng B-M, Raja Sekhar B N, Bhardwaj A, Hill H, Janardhan P , and, Mason N J (2023). European Physical Journal-D , 77,24, DOI:10.1140/epjd/s10053-023-00590-z

  102. The Origin of Extremely Non-radial Solarwind Outflows
    Diptiranjan Rout, Janardhan P ., Fujiki, K., Chakrabarty, D., and Bisoi, S. K. (2023). ApJ, 950, DOI: https://doi.org/10.3847/1538-4357/acd000

  103. Stability and Morphology of Cyanonaphthalene Icy mantles on ISM Cold Dust Analogues Ramachandrana, R., Rahul, K.K., Meka, J.K., Pavithra, S., Roy, A., Rajasekhar, B.N., Janardhan P., Anil Bhardwaja, Mason, N.J., and Sivaraman, B. (2023). Jou. Chem. Sci. , 135:77., DOI: https://doi.org/10.1007/s12039-023-02192-z

  104. Interstellar Carbonaceous Dust and Its Formation Pathways: From an Experimental Astrochemistry Perspective
    Arijit Roy, V. S. Surendra, R. Ramachandran, J. K. Meka, S. Gupta, P. Janardhan, B. N. Rajasekhar, H. Hill, Anil Bhardwaj, N. J. Mason, B. Sivaraman, (2023). Jou. Indian Inst. Sci. ., 1-20.

  105. Ultraviolet spectrum reveals the presence of ozone on Juipeter's moon Callisto
    R Ramachandran, J K Meka, K K Rahul, W Khan, J-I Lo, B-M Cheng, D V Mifsud, B N Rajasekhar, A Das, H Hill, Janardhan, P ., Anil Bhardwaj, N J Mason, B Sivaraman (2024). Icarus 410,   DOI: https://doi.org/10.1016/j.icarus.2023.115896

  106. Amorphous 1-Propanol Interstellar Ice Beyond its Melting Point
    Ramachandran, R., Hazarika, A., Gupta, S., Nag, S., Meka, J. K., Tejender S. Thakur, Yashonath, S., Vishwakarma, G., Chou, S. -L., Wu, Y. -J., Janardhan, P ., Rajasekhar, B. N., Anil Bhardwaj, Mason, N. J., Sivaraman, B., (2024).  MNRAS , 530(1),1027–1034.  DOI:,  https://doi.org/10.1093/mnras/stae759

  107. Prolonged and Extremely Non-radial Solar Wind Flows
    Bisoi,S.K., Rout, D.,Janardhan P., Ken’ichi Fujiki, Chakrabarty, D., and Sahu, K. (2024). Bull. Roy. Soc. Liege, 93(2), 1004--1017.  DOI: 10.25518/0037-9565.11946

  108. Experimental and computational study of ethanolamine ices at astrochemical conditions
    R Ramachandran, Milan Sil, Prasanta Gorai, J K Meka, S Pavithraa, J -I Lo, -L Chou, Y -J Wu, P Janardhan, B -M Cheng, Anil Bhardwaj, V´ıctor M. Rivilla, N J Mason, B Sivaraman, and Ankan Das. (2024). ApJ, , 975 ,Number 2, 181–193.  DOI:,10.3847/1538-4357/ad77c5

  109. Aditya Solar wind Particle Experiment (ASPEX) onboard Aditya–L1: The Solarwind Ion Spectrometer (SWIS)
    Prashant Kumar, Bhas Bapat, Manan S. Shah, Hiteshkumar L. Adalja, Arpit R. Patel, Pranav R. Adhyaru, Shanmugam M., Dibyendu Chakrabarty, Swaroop B. Banerjee, K. P. Subramanian, Aveek Sarkar, Tinkal Ladiya, Jacob Sebastian, Abhishek Kumar, Sushil Kumar, Nishant Singh, M. B. Dadhania, Santosh V. Vadawale, Shiv Kumar Goyal, Neeraj Kumar Tiwari, P Janardhan, Anil Bhardwaj (2025). Sol. Phys., 300,37.  DOI:,  https://doi.org/10.1007/s11207-025-02443-x

  110. Aditya Solar wind Particle Experiment (ASPEX) onboard Aditya–L1: The Supra-Thermal and Energetic Particle Spectrometer (STEPS)
    Shiv Kumar Goyal, Neeraj Kumar Tiwari, Arpit R. Patel, Shanmugam M., Santosh V. Vadawale, Dibyendu Chakrabarty, Jacob Sebastian, Bijoy Dalal, Piyush Sharma, Aveek Sarkar, Aaditya Sarda, Tinkal Ladiya, Abhishek J. Verma, Nishant Singh, Sushil Kumar, Deepak Kumar Painkra, Prashant Kumar, Manan S. Shah, Pranav R. Adhyaru, Hiteshkumar L. Adalja, Swaroop B. Banerjee, K. P. Subramanian, Bhas Bapat, M. B. Dadhania, Abhishek Kumar, P Janardhan, Anil Bhardwaj (2025). Sol. Phys., 300, ,35.  DOI:,  https://doi.org/10.1007/s11207-025-02441-z

  111. Infrared spectroscopy reveals ethylene glycol is an anti crystallizer in water-mixed astrochemical ices
    Wafikul Khan, R Ramachandran, S Gupta, J K Meka, V Venkataraman, H Hill, B N Rajasekhar,     P Janardhan,     Anil Bhardwaj, N J Mason, and, B Sivaraman (2025) LSSR, ,.  DOI:,  https://doi.org/10.1016/j.lssr.2025.01.006  [In Press]

  112. Instantaneous formation of interstellar minerals and mineral quantum dots
    Arijit Roy, Surendra V. Singh, R. Ramachandrana, J. K. Meka, M. Ambresh, T. Vijay     P Janardhan,     V. Jayaram, V. Venkatraman, A. Das, H. Hill, Anil Bhardwaj, N. J. Mason, and, B. Sivaraman (2025) RSC Advances, , , .  DOI:,  https://doi.org/10.1039/  [In Press]

  113. Energetic (< 2 MeV) Ion Environment of the Magnetosphere: Insights into External and Internal Drivers from ASPEX-STEPS Data onboard Aditya-L1
    Dibyendu Chakrabarty, Bijoy Dalal, Santosh Vadawale, Aveek Sarkar, Shiv Kumar Goyal, Jacob Sebastian, Anil Bhardwaj, P. Janardhan, M. Shanmugam, Neeraj Kumar Tiwari, Aaditya Sarda, Piyush Sharma, Aakash Gupta, Prashant Kumar, Bhas Bapat, Pranav R Adhyaru, Arpit R. Patel, Hitesh Kumar Adalja, Abhishek Kumar, Tinkal Ladiya, Sushil Kumar, Nishant Singh, Deepak Kumar Painkra, Abhishek J. Verma, Swaroop Banerjee, K. P. Subramanian, and M. B. Dadhania (2025). ApJL,  [Submitted]

  114. Metric Tyep II Radio Emission Associated with Coronal Mass Ejections of Large Angular Widths: Some New Insights
    Mayank Rajput, Susanta Kumar Bisoi, and P. Janardhan, (2025). A&A Lett,  [Submitted]

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   IAU Telegrams :

  1. PSR 0950+08.
    Janardhan, P., Deshpande, M. R., Bobra, A. D., Venat, P., Nirman, N. S. and Lali, K. S. (1992). IAU Circular No. 5575.

  2. Jupiter and Comet Shoemaker−Levy.
    O. P. N. Calla, V. Sukumaran, B. M. Darji, M. R. Deshpande, H. O. Vats, Janardhan, P., and N. M. Vadher., (1994). IAU Circular No. 6088.

  3. Comet C/1995 O1 (Hale−Bopp).
    Bird, M. K., Janardhan, P., Gensheimer, P., Huchtmeier, W. and Wilson, T. L., (1997). IAU Circular No. 6607.


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