2014 Fiscal Year Final Research Report
Observational study of atmospheric change in the polar mesosphere due to energetic particle precipitation during the solar maximum
| Project/Area Number |
23340145
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Space and upper atmospheric physics
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| Research Institution | Nagoya University |
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Principal Investigator |
MIZUNO AKIRA 名古屋大学, 太陽地球環境研究所, 教授 (80212231)
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| Co-Investigator(Kenkyū-buntansha) |
NAGAHAMA Tomoo 名古屋大学, 太陽地球環境研究所, 准教授 (70377779)
MAEZAWA Hiroyuki 大阪府立大学, 理学系研究科, 准教授 (00377780)
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| Co-Investigator(Renkei-kenkyūsha) |
NAKAMURA Takuji 国立極地研究所, 研究教育系, 教授 (40217857)
TSUTSUMI Masaki 国立極地研究所, 太研究教育系, 准教授 (80280535)
NAKAJIMA Taku 名古屋大学, 太陽地球環境研究所, 助教 (90570359)
OYAMA Hirofumi 名古屋大学, 太陽地球環境研究所, 研究員 (50600962)
ISONO Yasuko 国立極地研究所, 研究戦略企画室, URA
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| Research Collaborator |
KOJIMA Yasusuke 名古屋大学, 全学技術センター, 技術職員
KUWAHARA Toshihisa 名古屋大学, 理学研究科
KONDOU Syusaku 名古屋大学, 理学研究科
IINO Takahiro 名古屋大学, 理学研究科
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| Project Period (FY) |
2011-04-01 – 2015-03-31
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| Keywords | 中間圏大気 / 極域 / リモートセンシング / 太陽活動 / 環境変動 |
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| Outline of Final Research Achievements |
Temporal variation of nitric oxide (NO) in the mesosphere and the lower-thermosphere related to solar activities has been studied by using a superconducting millimeter-wave spectrometer at Syowa Station. Two types of time variations are identified; one is short-term variation lasting for several days and the other is seasonal variation occurring for about four months around the polar-night period. We revealed that the short-term variations are caused mainly by the energetic electrons precipitation from the radiation belt after the geomagnetic storm rather than solar proton events based on the comparison with the proton- and electron-flux data obtained by POSE satellite. On the other hand, the seasonal variations are related to both photochemistry and energetic electron precipitation; the time variation pattern is determined by the UV photo-dissociation of NO, and the amplitude of the variation is determined by the total flux of energetic electrons.
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| Free Research Field |
大気科学、電波天文学
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