Physics
Scientific paper
Aug 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jastp..64.1445r&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 64, Issue 12-14, p. 1445-1453.
Physics
3
Scientific paper
Medium frequency (MF) radar spaced antenna observations at heights close to the location of the equatorial electrojet over Tirunelveli (/8.7°N, /77.8°E, geographic, /0.35°N magnetic dip) are used to examine the influence of the electrodynamical processes in the determination of neutral winds in the lower E-region. On many days, daytime wind and tidal characteristics change at heights above 94km, when analysis is performed on day-to-day basis. Under these conditions, the spaced antenna measurements need not represent neutral winds at all. On the other hand, on a few other days, the `drifts' at 98km are opposite to those expected from the electrodynamical considerations leading us to believe that we might be measuring neutral winds around this time. Selected days during the year 1995 bring out this complex nature of the spaced antenna measurements carried out over the magnetic equator. Ground-based geomagnetic field data provide information on the electrodynamical state of the equatorial ionospheric E-region.
Gurubaran S.
Rajaram Ramaswamy
Ramkumar T. K.
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