Solar and geomagnetic activity effects on nocturnal zonal velocities of ionospheric plasma depletions.

Details Solar and geomagnetic activity effects on nocturnal zonal velocities of ionospheric plasma depletions. Solar and geomagnetic activity effects on nocturnal zonal velocities of ionospheric plasma depletions.

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999adspr..24.1507s&link_type=abstract

Advances in Space Research, Vol. 24, No. 11, p. 1507 - 1510

Physics

12

Earth Ionosphere: Solar Activity

Scientific paper

The understanding of postsunset zonal drifts of ionospheric plasma depletions in the equatorial and subequatorial regions are of importance to the knowledge of the electrodynamics of the nocturnal ionosphere. Drifts occurring over the low latitude station Cachoeira Paulista-CP during the October and March time frames are analyzed for the period 1980 - 1992. That analysis is based upon about 650 days of zonal scanning photometer measurements of the nocturnal O I 630 nm airglow. The zonal motions of valleys of the O I 630 nm intensity are used to infer the eastward plasma velocity variations with local time. In this way, the velocity variations with solar activity and magnetic activity are studied. The mean trend in the velocity local time variation is a decrease from early evening to postmidnight hours, as expected in view of the F-region vertical electric fields, naturally decreasing magnitudes after sunset due to recombination. The zonal velocity decay between 21 LT and 02 LT is faster during the period of maximum solar activity than during the solar minimum period.

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