HR: 1340h
AN: SA33B-1335    [Abstracts]
TI: Distributions of Pre-sunrise Plasma Heating in the Low- and Mid-latitude Topside Ionosphere
AU: * Chao, C
EM: ckchao@jupiter.ss.ncu.edu.tw
AF: Institute of Space Science, National Central University, No.300, Jhongda Rd., Chung-Li, 320, Taiwan
AU: Su, S
EM: sysu@jupiter.ss.ncu.edu.tw
AF: Institute of Space Science, National Central University, No.300, Jhongda Rd., Chung-Li, 320, Taiwan
AU: Oyama, K
EM: oyama@jupiter.ss.ncu.edu.tw
AF: Institute of Space Science, National Central University, No.300, Jhongda Rd., Chung-Li, 320, Taiwan
AU: Yeh, H
EM: yeh@jupiter.ss.ncu.edu.tw
AF: Institute of Space Science, National Central University, No.300, Jhongda Rd., Chung-Li, 320, Taiwan
AB: Pre-sunrise ionospheric heating above F layer peak was first observed by Carlson (1966) with incoherent backscatter radar at Arecibo Ionospheric Observatory during winter season. Photoelectrons streaming from sunlit magnetic conjugate ionosphere were concluded to produce the observed ionosphere heating. Recently global distributions of ion temperature were available from Ionospheric Plasma and Electrodynamics Instrument (IPEI) onboard the first satellite of Republic of China, ROCSAT-1, to study the pre-sunrise ion heating (Chao et al., 2003). The results showed that the most enhanced pre-sunrise heating was located in the longitude sector between 165° E and 195°E in the southern hemisphere (South Pacific region) during June solstice and between 75° W and 15° W in the northern hemisphere (North Atlantic region) during December solstice. In this study, we have compared with electron temperature distributions observed two decades ago by Hinotori satellite. The two distributions match very well in the 0400-0500 LT sector. We will also verify the distributions with results from SAMI2 model for more details.
DE: 2415 Equatorial ionosphere
DE: 2443 Midlatitude ionosphere
DE: 2467 Plasma temperature and density
DE: 2481 Topside ionosphere
SC: SPA-Aeronomy [SA]
MN: 2007 Fall Meeting