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  1. F300 宇宙地球環境研究所
  2. F300b 紀要
  3. Proceedings of the Research Institute of Atmospherics, Nagoya University
  4. 36(2)

IONOSPHERIC INCOHERENT SCATTER MEASUREMENTS WITH THE MU RADAR: OBSERVATIONS DURING THE LARGE MAGNETIC STORM OF 6-8 FEBRUARY 1986

http://hdl.handle.net/2237/22055
http://hdl.handle.net/2237/22055
0f3a0c8f-a7d1-46ee-9dbe-0c3eb7fc0dc5
名前 / ファイル ライセンス アクション
proria_36_2_151.pdf proria_36_2_151.pdf (1.7 MB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2015-05-27
タイトル
タイトル IONOSPHERIC INCOHERENT SCATTER MEASUREMENTS WITH THE MU RADAR: OBSERVATIONS DURING THE LARGE MAGNETIC STORM OF 6-8 FEBRUARY 1986
言語 en
著者 Oliver, W. L.

× Oliver, W. L.

WEKO 53771

en Oliver, W. L.

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Fukao, S.

× Fukao, S.

WEKO 53772

en Fukao, S.

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Sato, T.

× Sato, T.

WEKO 53773

en Sato, T.

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Tsuda, T.

× Tsuda, T.

WEKO 53774

en Tsuda, T.

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Kato, S.

× Kato, S.

WEKO 53775

en Kato, S.

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Kimura, I.

× Kimura, I.

WEKO 53776

en Kimura, I.

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Ito, A.

× Ito, A.

WEKO 53777

en Ito, A.

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Saryou, T.

× Saryou, T.

WEKO 53778

en Saryou, T.

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Araki, T.

× Araki, T.

WEKO 53779

en Araki, T.

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アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
抄録
内容記述 The MU (Middle and Upper atmosphere) radar of Japan is a 46.5-MHz, pulse-modulated, monostatic, Doppler radar with an active phased-array antenna which consists of 475 crossed Yagis. This system has been used primarily, since its initial observations with a partial system in 1983, to observe the coherent backscatter from irregularities in the troposphere, stratosphere, and mesosphere (MST radar). However, this system was also designed to be able to observe the weak incoherent scatter (IS) from the free electrons of the ionosphere. We report here the MU radar IS observations made during the strong geomagnetic storm of 6- 8 February 1986. During this period the MU radar observed the echo power (an approximate measure of electron density) simultaneously in four antenna beam positions. Coincident with the rise in the Kp index from 3+ to 6- near 1.8 LT (9 UT) on 7 February the MU radar detected the beginning of several hours of wave activity having a period of 100 minutes. By correlating the density observations in the different beams and at different altitudes, we were able to compute the phase speed (410 m/s), direction of travel (19° west of south), and horizontal (2500 km) and vertical (290-490 km) wavelength of the wave. The F-layer peak density and height oscillated during this nighttime period, and we consider several mechanisms that might cause these effects. We find that the density oscillation was too large to be caused solely by wave dynamics. We suggest that an in-flux of ionization from the plasmasphere, and a wave-induced modulation of the assimilation of this plasma flux into the ambient density, may have been the cause of the observed density increases. During the following morning (8 February) the F-layer density was observed to become increasingly large while the layer peak height dropped, and we also consider the cause for this effect.
言語 en
内容記述タイプ Abstract
内容記述
内容記述 This special issue contains contributed papers presented at the symposium "Solar Terrestrial Events in February-March 1986" (January 19, 1989, Nagoya)
言語 en
内容記述タイプ Other
出版者
言語 en
出版者 The Research Institute of Atmospherics, Nagoya University
言語
言語 eng
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ departmental bulletin paper
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
ISSN(print)
収録物識別子タイプ PISSN
収録物識別子 0077-264X
書誌情報 en : Proceedings of the Research Institute of Atmospherics, Nagoya University

巻 36, 号 2, p. 151-167, 発行日 1989-11
著者版フラグ
値 publisher
URI
識別子 http://hdl.handle.net/2237/22055
識別子タイプ HDL
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