Ionisation ledges and the counter-electrojets in the equatorial ionosphere

Details Ionisation ledges and the counter-electrojets in the equatorial ionosphere Ionisation ledges and the counter-electrojets in the equatorial ionosphere

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976cosp.meetr....r&link_type=abstract

COSPAR, Plenary Meeting, 19th, Philadelphia, Pa., June 8-19, 1976, Paper. 9 p. Research supported by the Department of Space of

Mathematics

Logic

Atmospheric Ionization, E Region, Equatorial Electrojet, Geomagnetism, Solar Activity Effects, Anomalies, Daytime, Diurnal Variations, Magnetic Variations, Night Sky, Satellite Observation

Scientific paper

Results are presented for a comparison concerning the occurrence of two phenomena in the equatorial ionosphere: (1) the ionization ledge in the topside ionosphere and (2) the counter-electrojet in the E-region. About 170 ionization-ledge observations on magnetically undisturbed days, when compared with the diurnal variation of the difference between increments from the nighttime base level in the horizontal components of earth's magnetic field at Trivandrum and Alibag, reveal that the counter-electrojet, either partial or full in the afternoon, occurred on 70 per cent of these days. The morphological features of both phenomena (more frequent occurrence during solar minima than solar maxima, identical lunar-age dependence) are in conformity with the conclusion that the production mechanism for both is the same. Since a neutral anomaly is now known to be the cause of ionization-ledge formation, it is suggested that the same anomaly might also be responsible for the counter-electrojet.

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