Professional Appointments:
- Visiting Scientist, M.L. Sultan Technikon, Durban, S. Africa and Univ. of Durban-Westville, Durban, S. Africa(Sept. 9, 2001-Oct. 4, 2001).
- Visiting Scientist, University of Natal, Durban, South Africa and Univ. of Durban-Westville, Durban, South Africa (May 12, 2002-June 8, 2002).
- Visiting Scientist, Bulgarian Academy of Sciences, Sofia, Bulgaria (Sept. 21 – Oct. 16, 2005 and Sept. 10 – Oct. 7, 2006).
- Visiting Scientist, University of Witwatersrand, Johannesburg, South Africa and University of Kwazulu-Natal, Durban, South Africa (March 2 – May 14, 2007).
- Visiting Scientist, University of the Western Cape, Bellville, South Africa (May 7 – June 7, 2008, July 2- August 11, 2009, May 5- June 27, 2010, April 16- June 10, 2011, Feb. 13- March 23, 2012, August 17- September 17, 2012 and April 13- June 8, 2013).
- Visiting Associate Professor, RISH, Kyoto University, Kyoto, Japan (August 1, 2013-January 31, 2014).
- Visiting Scientist, University of the Western Cape, Bellville and Hermanus Magnetic Observatory, Hermanus, South Africa (September 1- October 1, 2014).
- Visiting Scientist, University of the Western Cape, Bellville and Hermanus Magnetic Observatory, Hermanus, South Africa (September 22- October 21, 2015).
- Visiting Scientist, RISH, Kyoto University, Kyoto, Japan (February 15-March 14, 2016) under Indo-Japan Project “Comprehensive study of particle acceleration processes in Earth’s magnetosphere during extreme space weather events”.
- Visiting Professor, RISH, Kyoto University, Kyoto, Japan (April 1-June 30, 2019).