Night-time electron temperature troughs in the equatorial topside ionosphere revealed from RPA experiments on the ISS-b satellite

Details Night-time electron temperature troughs in the equatorial topside ionosphere revealed from RPA experiments on the ISS-b satellite Night-time electron temperature troughs in the equatorial topside ionosphere revealed from RPA experiments on the ISS-b satellite

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jatp...43.1165s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 43, Nov. 1981, p. 1165-1173.

Computer Science

Sound

2

Electron Energy, Ionospheric Electron Density, Ionospheric Sounding, Satellite-Borne Instruments, Upper Ionosphere, Field Aligned Currents, Ionospheric Ion Density, Night, Satellite Observation

Scientific paper

Night-time electron temperature (T sub e), electron density (N sub e) and the mean ion mass (M sub i) of the topside ionosphere at altitudes of about 1100 km have been obtained from the RPA experiments on ISS-b. Global maps of these quantities are derived by adopting the spherical surface harmonic functions fitted to the satellite data by means of a least-square method. The night-time map of T sub e shows a marked equatorial trough which is limited to a 100 deg longitudinal sector and a 20 deg latitudinal extent. The center of the trough is located a few degrees 'summerward' of the dip equator. The longitude of the trough is strongly controlled by the magnetic declination. This longitude changes rapidly around autumnal equinox from the region of maximum westward declination to that of eastward declination; the opposite change occurs around the time of vernal equinox. The maps of M sub i and N sub e in low latitudes have features apparently related to the T sub e trough. These features can be explained in terms of field-aligned interhemispheric plasma flow driven by the neutral air wind.

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