GEOTAIL observation of upstream ULF waves associated with lunar wake
-
- Nakagawa Tomoko
- Tohoku Institute of Technology
-
- Takahashi Yoshinori
- Tohoku Institute of Technology
-
- Iizima Masahide
- Tohoku University
この論文をさがす
抄録
Left-handed, circular polarized ULF waves with frequency of 0.3-1.1 Hz were detected by GEOTAIL at 27 lunar radii upstream of the moon when the spacecraft was magnetically connected with the lunar wake. The wave was detected twice at 16: 45-17: 00 and 18: 55-19: 02 on October 25, 1994, when the spacecraft and the moon were on the dawn side of the Earth's magnetosphere. The ULF wave was propagating in a direction nearly parallel to the background magnetic field. The observed frequency and polarization are explained by reversal of polarization of right-handed, sunward-propagating electron whistler waves with frequencies above 1.4 Hz in the solar wind frame of reference, which were excited through the interaction with electron beams flowing in anti-sunward direction downstream of the lunar wake. The downstream flow of electron beam is explained by filtering effect of the potential drop at the boundary of the lunar wake. Low-energy components of electrons are reflected back by the potential drop, and the rest components, with energies higher than that of the electric potential penetrate through the wake. The velocity distribution of downstream electrons would be modified to have some bump or shoulder in energy range to form a beam, which is likely to excite whistler mode wave through cyclotron resonance. The lowest energy of the resonant electrons was calculated to be 0.96-2.5 (keV) from the lower boundary of the detected frequency. The variation in the lowest frequency suggests that there are some regions of the lunar wake where potential drop is reduced.
収録刊行物
-
- Earth, Planets and Space
-
Earth, Planets and Space 55 (9), 569-580, 2003
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会
- Tweet
キーワード
詳細情報 詳細情報について
-
- CRID
- 1390001206513659776
-
- NII論文ID
- 10012534893
- 130003780978
-
- NII書誌ID
- AA11211921
-
- ISSN
- 18805981
- 13438832
-
- NDL書誌ID
- 6743261
-
- 本文言語コード
- en
-
- データソース種別
-
- JaLC
- NDL
- Crossref
- CiNii Articles
-
- 抄録ライセンスフラグ
- 使用不可