다목적 실용위성 1호로 측정한 저위도 상부 이온층의 전자 온도와 전자 밀도의 경도 및 계절별 변화

• Published in: Journal of astronomy and space sciences 2002, 19(2), , pp.123-132
• Main Authors: 김희준, 박선미, 이재진, 이은상, 민경욱, 한원용, 남욱원, 진호, Heejun Kim, Sun Mie Park, Jae-Jun Lee, Ensang Lee, Kyoung-Wook Min, Wonyong Han, Uk-Won Nam, Ho Jin
• Format: Article
• Language: Korean
• Subjects: 천문학
• ISSN: 2093-5587; 2093-1409

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. KCI Citation Count: 0