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Validation of electron density and temperature observed by DEMETER

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Title: Validation of electron density and temperature observed by DEMETER
Authors: Kakinami, Yoshihiro Browse this author
Kamogawa, Masashi Browse this author
Onishi, Tatsuo Browse this author
Mochizuki, Kaori Browse this author
Lebreton, Jean-Pierre Browse this author
Watanabe, Shigeto Browse this author →KAKEN DB
Yamamoto, Masa-Yuki Browse this author
Mogi, Toru Browse this author →KAKEN DB
Keywords: Electron density and temperature in the upper ionosphere
DEMETER satellite
Langmuir probe
Contamination of probe
Electron temperature in deep solar minimum solar cycle 23/24
Issue Date: 1-Oct-2013
Publisher: Elsevier sci ltd
Journal Title: Advances in space research
Volume: 52
Issue: 7
Start Page: 1267
End Page: 1273
Publisher DOI: 10.1016/j.asr.2013.07.003
Abstract: Measuring electron density (Ne) and temperature (Te) using a DC Langmuir probe in the ionosphere is very often degraded by the electrode contamination. In order to examine the accuracy of DEMETER observations, we compared DEMETER Ne and Te with several other satellites observations and IRI2012 as reference data. DEMETER Ne and Te show well-known dependencies on the solar irradiance except for the range of F10.7 > 100. However, DEMETER Ne are about 70% lower than those of IRI in day time data and its solar irradiance dependency is consistent with the reference data in night time data. It was confirmed that the negative slope appears in deep solar minimum solar cycle 23/24. DEMETER Te are higher than IRI data by 500-1500 K in day time and by 800 K in night time. The relation between Ne and Te is well defined by a negative slope both in DEMETER and IRI during day time, while such a similarity is not recognized in night time data. DEMETER Te is 700 K higher than IRI Te for the same value of Ne. When Ne is less than 10(4) cm(-3) in night time, significant reductions in DEMETER Te are observed, which is close to expected values. Such discrepancies from the reference data and some peculiar behaviors of DEMETER Te and Ne data necessitate a careful attention in using them in consideration of their data alterations. However, their relative variations and averaged behavior in time contain useful information for scientific studies such as dependencies on solar irradiance and wave-4 longitudinal structure under certain conditions (Ne > 10(4) cm(-3) and F10.7 < 100). (C) 2013 COSPAR. Published by Elsevier Ltd. All rights reserved.
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 茂木 透

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