GEOMAGNETIC-FIELD VARIATIONS AT LOW LATITUDES AND IONOSPHERIC ELECTRIC-FIELDS

Authors
Citation
Rg. Rastogi, GEOMAGNETIC-FIELD VARIATIONS AT LOW LATITUDES AND IONOSPHERIC ELECTRIC-FIELDS, Journal of atmospheric and terrestrial physics, 55(10), 1993, pp. 1375-1381
Citations number
23
Categorie Soggetti
Metereology & Atmospheric Sciences
ISSN journal
00219169
Volume
55
Issue
10
Year of publication
1993
Pages
1375 - 1381
Database
ISI
SICI code
0021-9169(1993)55:10<1375:GVALLA>2.0.ZU;2-4
Abstract
The solar cycle, seasonal and daily variations of the geomagnetic H fi eld at an equatorial station, Kodaikanal, and at a tropical latitude s tation, Alibag, are compared with corresponding variations of the E-re gion ionization densities. The solar cycle variation of the daily rang e of H at either of the stations is shown to be primarily contributed to by the corresponding variation of the electron density in the E-reg ion of the ionosphere. The seasonal variation of the DELTAH at equator ial stations, with maxima during equinoxes, is attributed primarily to the corresponding variation of the index of horizontal electric field in the E-region. The solar daily variation of DELTAH at the equatoria l station is attributed to the combined effects of the electron densit y with the maximum very close to noon and the index of electric field with the maximum around 1030 LT, the resulting current being maximum a t about 1110 LT. These results are consistent with the ionosphere E-re gion electron horizontal velocity measurements at the equatorial elect rojet station, Thumba in India.