S. K. Mitra Centre for Study in Space Environment,
University College of Science & Technology,
Calcutta University,
Calcutta - 6.

Radio & Atmospheric Science Division,
National Physical Research Laboratory,
New Delhi - 12.

C-DAC,
Pune.

ATMOSPHERIC SCIENCE DEPARTMENT,
COCHIN UNIVERSITY OF SCIENCE & TECHNOLOGY,
COCHIN - 682022.

NIGERIAN METEOROLOGICAL AGENCY,
PMB 1215 OSHODI LAGOS,
Nigeria.