Physics
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jastp..63..599r&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 63, Issue 6, p. 599-604.
Physics
2
Scientific paper
The solar flare effects (sfe) in the horizontal /(H), vertical /(Z) and eastward /(Y) geomagnetic fields at the equatorial electrojet stations around the world operating during International Geophysical Year and International Geophysical Cooperation Year (IGY-IGC, /1957-/59) period have been examined. The amplitude of sfe/(H) at any station was maximum around midday hours. The amplitude of sfe/(Z) showed an abnormally large positive value at Trivandrum in spite of it being only /0.3° south of the magnetic equator. The ratio of /ΔZ/ΔH exceeded 1.0 in most of the cases, the mean value being 1.34. During counter electrojet period both /ΔH and /ΔZ were negative maintaining similar high /ΔZ/ΔH values. These abnormal values of /ΔZ at Trivandrum are due to induction of electrojet current in the conducting graben in Palk Strait, between India and Sri Lanka. The latitudinal extent of induction effects in sfe/(Z) in India depends on the sharpness of the temporal growth of the flare.
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