Geomagnetic conjugate observation of therinospheric waves at midlatitudes

中纬度地区热流层波的地磁共轭观测

• 批准号: 13573006
• 负责人: SHIOKAWA Kazuo
• 金额: $ 7.81万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13573006/
• 关键词: thermosphere; ionosphere; traveling ionospheric disturbance; plasma bubble; international network observation (U.S.A., Australia); 国際情報交換; アメリカ:オーストラリア; 国際情報交換(アメリカ,オーストラリア)

(1)We have investigated a nighttime medium-scale traveling ionospheric disturbance(MSTID) observed by an airglow imager at Shigaraki, Japan. The structure was identified in the airglow images of OI (630.0 nm and 777.4 nm) as NW-SE band structures moving southwestward with a velocity of 50 m/s. We found that an electric field oscillation of -1.2 mV/m was sufficient to reproduce the observed airglow amplitudes. This modeled electric field was comparable to that observed by the DMSP F15 satellite as it passed over Shigaraki during our observing period. The DMSP ion drift data show that the oscillation of the polarization electric field correlated with the MSTID structure in the airglow image.(2)We found a large-scale equatorial F-region airglow depletions extending to low-midlatitudes in both hemispheres. The observational sites were located at low-midlatitude geomagnetic conjugate points. Clear depletions of 630.0-nm airglow intensity due to equaterial plasma bubbles were simultaneously observed with two all-sky imagers at Sata, Japan (magnetic latitude 24° N), and its geomagnetic conjugate point, Darwin, Australia (magnetic latitude 22° S). These observations indicate that plasma depletions in the equatorial ionosphere elongate along the geomagnetic field lines.(3)We report for the first time simultaneous observations of MSTIDs at geomagnetic conjugate points in both hemispheres, using two all-sky airglow imagers at midlatitudes. A 630-nm all-sky imager at Sata, Japan, detected MSTIDs with a wave front elongated from NW to SE. MSTIDs with a wave front elongated from SW to NE were observed at the geomagnetic conjugate point, Darwin, Australia. The MSTID structures mapped from Darwin to its magnetic conjugate points along the geomagnetic field lines coincide closely with those in the Sata images. This result suggests that polarization electric field plays an important role in the generation of MSTIDs.

(1)We研究了日本Shigaraki的气辉成像仪观测到的夜间中等尺度行进电离层扰动（MSTID）。在OI（630.0 nm和777.4 nm）的气辉图像中，该结构被识别为以50 m/s的速度向西南方向移动的NW-SE带结构。我们发现，-1.2 mV/m的电场振荡足以再现所观察到的气辉振幅。该模拟电场与DMSP F15卫星在我们的观测期间经过Shigaraki时观测到的电场相当。DMSP离子漂移数据表明，极化电场的振荡与气辉图像中的MSTID结构相关。(2)We发现了一个大规模的赤道F区气辉耗尽延伸到低中纬度地区在两个半球。观测点位于低中纬度地磁共轭点。在日本佐田（磁纬24° N）和澳大利亚达尔文（磁纬22° S）的地磁共扼点，用两台全天空成像仪同时观测到了由于等离子体气泡引起的630.0 nm气辉强度的明显衰减。这些观测结果表明，赤道电离层中的等离子体耗尽沿地磁场线沿着伸长。(3)We 2009年，美国国家天文台利用两台中纬度全天空气辉成像仪，首次报告了在两个半球的地磁共扼点同时观测MSTID的情况。日本佐田的一台630纳米全天空成像仪探测到了MSTID，其波前从西北向东南延伸。在澳大利亚达尔文的地磁共扼点观测到波前由西南向东北方向延长的MSTID。从达尔文到其磁共轭点沿着磁力线的MSTID结构与Sata图像上的结构非常吻合。这一结果表明，极化电场在MSTID的产生中起着重要的作用。

项目成果

Geomagnetic conjugate observations of equatorial airglow depletions

• DOI: 10.1029/2002gl015347
• 发表时间: 2002-08
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Yuichi Otsuka;K. Shiokawa;T. Ogawa;P. Wilkinson

Geomagnetic conjugate observations of medium‐scale traveling ionospheric disturbances at midlatitude using all‐sky airglow imagers

• DOI: 10.1029/2004gl020262
• 发表时间: 2004-08
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Yuichi Otsuka;K. Shiokawa;T. Ogawa;P. Wilkinson

Otsuka, Y: "Geomagnetic conjugate observations of equatorial airglow depletions"Geophys. Res. Lett.. 29,15. 43.1-43.4 (2002)

Otsuka, Y：“赤道气辉消耗的地磁共轭观测”地球物理学。

Shiokawa, K.: "Statistical study of nighttime medium-scale traveling ionospheric disturbances using midlatitude airglow images"J. Geophys. Res.. (in press). (2002)

Shiokawa, K.：“利用中纬度气辉图像进行夜间中尺度移动电离层扰动的统计研究”J.

Geomagnetic conjugate observation of nighttime medium- and large-scale traveling ionospheric disturbances : FRONT3 campaign

夜间中大规模移动电离层扰动的地磁共轭观测：FRONT3 活动

• 发表时间: 2005
• 期刊: J.Geophys.Res. (印刷中)
• 作者: Shiokawa;K.;Y.Otsuka;T.Ogawa;M.Yamamoto他7名
• 通讯作者: M.Yamamoto他7名