1. KSK Geomagnetic Research Laboratory; Indian Institute of Geomagnetism; Allahabad India
2. Department of Electrical Engineering; Stanford University; Stanford California USA
3. Indian Institute of Geomagnetism; Navi Mumbai India
4. School of Engineering and Physics; University of the South Pacific; Suva Fiji
5. Aryabhatta Research Institute of Observational Sciences; Nainital India
6. Physics Department; Banaras Hindu University; Varanasi India
7. Department of Electrical Engineering; Koc University; Istanbul Turkey