Global Distributions of Ion Temperature Observed by ROCSAT-1 Satellite in the Evening Sector

Details Global Distributions of Ion Temperature Observed by ROCSAT-1 Satellite in the Evening Sector Global Distributions of Ion Temperature Observed by ROCSAT-1 Satellite in the Evening Sector

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa33a0263c&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA33A-0263

Physics

2415 Equatorial Ionosphere, 2443 Midlatitude Ionosphere, 2467 Plasma Temperature And Density, 2481 Topside Ionosphere

Scientific paper

The ion temperature has been measured with the Ionospheric Plasma and Electrodynamics Instrument (IPEI) onboard the first satellite of Republic of China, ROCSAT-1, orbiting at 600 km altitude with a 35° inclination. Global ion temperature distributions in the evening sector for different seasons are investigated during the solar maximum year of 2000 and are found similarly to the past study [Venkatraman and Heelis, 1999]. At solstices, temperature crests and troughs are located in the winter hemisphere and near the dip equator (close to summer hemisphere), respectively. Both the maximum in the temperature crests and the minimum in the temperature troughs are located in a longitudinal region of negative magnetic declination during the June solstice and in the longitudinal region of positive magnetic declination during the December solstice. Such variations are attributed to the field-aligned ion pattern, which can be identified through the ROCSAT measurement and SAMI2 model. Meanwhile, the temperature crests disappear after 21 LT but the temperature troughs last for all night due to the lower O+-H+ transition height at low and middle latitudes but the higher one at the dip equator. These phenomena will also be compared with the results from the SAMI2 model.

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