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Ann. Geophys., 26, 533-541, 2008
www.ann-geophys.net/26/533/2008/
© European Geosciences Union 2008
Electron temperature in nighttime sporadic E layer at mid-latitude
K.-I. Oyama1, T. Abe2, H. Mori3, and J. Y. Liu1
1Institute of Space Science, National Central University, Jhongda Rd., Jhongli, Taiwan
2Institute of Space and Astronautical Science/Japan Space Exploration Agency, 3-1-1, Yoshinodai, Sagamihara, Japan
3National Institute of Information and Communications Technology, 4-2-1, Nukui-kitamachi, Koganei, Tokyo, Japan
Abstract. Electron temperature in the sporadic E layer was measured with a
glass-sealed Langmuir probe at a mid-latitude station in Japan in the framework of the SEEK
(Sporadic E Experiment over Kyushu)-2 campaign which was
conducted in August 2002. Important findings are two fold: (1) electron
temperature and electron density vary in the opposite sense in the height
range of 100–108 km, and electron temperature in the Es layer is lower than
that of ambient plasma, (2) electron temperature in these height ranges is
higher than the possible range of neutral temperature.
These findings strongly suggest that the heat source that elevates electron
temperature much higher than possible neutral temperature exists at around
100 km, and/or that the physical parameter values, which are used in the
present theory to calculate electron temperature, are not proper.
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