1. First Indo-US workshop on Solar Physics, June 12-16, 1979, USO, Udaipur

 

2. Second Indo-US Workshop on Interplanetary Scintillations and Solar activity”, February 1-2, 1988, at USO, Udaipur and February 3-5, 1988 at PRL, Ahmedabad (Proceeding published by PRL, Eds. RV Bhonsle, A. Bhatnagar, M. Dryer, S.K. Alurkar, A. Ambastha, and H.O. Vats)

 

3. Indo-US tutorial workshop on helioseismology, PRL, Ahmedabad, January 1993

 

4. International Symposium on “Windows on the Solar Interior”, TIFR, Mumbai, October 1995. (Proceedings of the meeting are published in Bull. Astron. Soc. India, 1996)

 

5. PRL Golden Jubilee Workshop on “Solar physics in India during the next solar maximum and beyond”, October 7-10, 1996, USO, Udaipur (Proceedings published in Bull. Astron. Soc. India, vol 26, number 2, June 1998, Guest Editor: Ashok Ambastha)

 

6. USO Silver Jubilee Meeting on “Probing the Sun with high resolution”, October 16-19, 2001, USO, Udaipur (Proceedings published by Narosa Publishing House, Eds. S.C. Tripathy& P. Venkatakrishnan, July 2002)