Longitudinal and Seasonal Variations of the Electron Temperature and Density in the Low-Latitude Topside Ionosphere Observed by KOMPSAT-1

Details Longitudinal and Seasonal Variations of the Electron Temperature and Density in the Low-Latitude Topside Ionosphere Observed by KOMPSAT-1 Longitudinal and Seasonal Variations of the Electron Temperature and Density in the Low-Latitude Topside Ionosphere Observed by KOMPSAT-1

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jass...19..123k&link_type=abstract

Journal of Astronomy and Space Science, vol. 19, no. 2, p. 123-132

Computer Science

Sound

Ionospheric Structure, Ionospheric Soundings

Scientific paper

The electron density and temperature in the topside ionosphere are observed by the Ionosphere Measurement Sensor (IMS) onboard the KOMPSAT-1, which has the sun-synchronous orbit of the altitude of 685 km and the orbital inclination of 98deg with a descending node at 22:50LT. Observations have been analyzed to determine the seasonal variations of the electron density and temperature in the low-latitude region. Only the night-time (22:50LT) behavior on magnetically quiet days (Kp < 4) has been examined. Observations show a strong longitudinal and seasonal variation. Generally, in the dip equator the density increases and the temperature decreases. In equinox the latitudinal distributions of the electron density and temperature are quite symmetric about the dip equator. However, the local maximum of the density and the local minimum of the temperature shift toward the Northern hemisphere in summer solstice but the Southern hemisphere in winter solstice. Such variations are due to the influences of field-aligned plasma transport induced by F region neutral wind. Compared with the IRI95 model, the observed electron density and temperature show significant differences from those predicted by the IRI95 model.

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