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https://ir.lib.ncu.edu.tw/handle/987654321/102134
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| 題名: | Behaviour of the low-latitude ionosphere-plasmasphere system at long deep solar minimum |
| 作者: | 劉正彥;Balan, N;Chen, CY;Liu, J Y;Bailey, G J |
| 貢獻者: | 地球科學學院太空科學與工程學系 |
| 日期: | 2012-12-01 |
| 上傳時間: | 2026-04-23 11:03:21 (UTC+8) |
| 出版者: | Council of Scientific and Industrial Research |
| 摘要: | 摘要： The behaviour of the low-latitude ionosphere-plasmasphere system during the long deep solar minimum between solar cycles 23 and 24 is presented using the physics based model SUPIM and FORMOSAT-3/COSMIC satellite data. Using the vertical ion drift velocity measured by C/NOFS satellite, and neutral densities and wind velocities obtained from MSIS and HWM, SUPIM calculates the electron and ion (O super(+), H super(+), He super(+), N super(+) sub(2), O super(+) sub(2), and NO super(+)) densities and temperatures and plasma fluxes within plus or minus 40 degree magnetic latitudes and 150-2000 km heights for Indian longitudes at equinox (F10.7 = 68, Ap = 4). FORMOSAT-3 measures the corresponding electron density up to 600 km height. The data and model show the ionosphere contracting to a thin layer during the long deep solar minimum. During daytime, the ionosphere has a half-width of only about 250 km over the equator and 150 km at EIA crests with a peak density of about 10 super(6) cm super(-3) and O super(+)/H super(+) transition height at around 750 km. At night, the ionosphere reduces to a cold thin layer of half-width less than about 150 km at the crests with a peak density of about 10 super(5) cm super(-3), and transition height about 500 km where the ion densities reduce to about 10 super(4) cm super(-3). Plasma density in the plasmasphere (above transition height) remains nearly constant at about 10 super(4) cm super(-3) during both day and night, and decreases only very slowly with height. However, the temperatures increase rapidly at sunrise at all heights to reach about 2500 K (electron) and 2250 K (ion) at 0800 hrs LT at 2000 km height (at EIA crests), which decrease by a maximum of only 250 K until sunset. After sunset, both electrons and ions cool rapidly until about midnight and then decrease slowly to nearly constant temperatures at all heights to about 650 K prior to sunrise. SUPIM predictions and FORMOSAT-3 data agree also with C/NOFS and CHAMP satellite observations.
出版日期： 2012-04-01
出處： Indian journal of radio & space physics, 2012-04, Vol.41 (2), p.89-97
識別號： ISSN: 0367-8393 |
| 顯示於類別: | [太空科學與工程學系] 期刊論文
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