Study of the variation of the thermosphere by equatorial atmospheric energy

赤道大气能量对热层变化的研究

• 批准号: 13136201
• 负责人: OGAWA Tadahiko
• 金额: $ 62.59万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research on Priority Areas
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13136201/
• 关键词: mesosphere; thermosphere; ionosphere; plasma bubble; traveling ionospheric disturbances; ionospheric irregularities; airglow; GPS; 赤道大気・プラズマ環境; 赤道電離圏・熱圏・中間圏; 熱圏大気光; プラズマ・大気波動; CCDカメラ; GPS衛星; 国際情報交換; インドネシア

We have been conducted ground-based observations of the ionosphere and thermosphere in Indonesia, Japan, and Australia We paid special attention to 100-1000 km scale disturbances in the equatorial F-region ionosphere and thermosphere, i.e., medium-scale traveling ionospheric disturbances (MSTIDs) and plasma bubbles. MSTIDs detected with a 630-nm all-sky imager at Kototabang in Indonesia appear within and in the south of the equatorial F-region anomaly crest with a high occurrence in May and June, and have, on the average, a phase velocity of 300 m/s toward the south and a wavelength of 700 km. Plasma bubbles moving eastward at about 100 m/s have a scale of about 100 km with spacings of 200-250 km, and are embedded within plasma structures with an east-west scale of about 1000 km. MSTIDs and giant plasma bubbles can be simultaneously detected at lower midlatitudes in Japan and Australia that are connected by the geomagnetic field line, and are very identical in appearance in the both hemispheres. Equatorial ionospheric scintillations of GPS radio waves associated with plasma bubbles have been continuously monitored at Kototabang. They appear predominantly from sunset to midnight in equinoctial months, a characteristic of equatorial plasma bubble occurrences. To investigate possible dynamical coupling between the ionosphere/thermosphere and troposphere over the equator, we compare the scintillation activity and Earth's brightness temperature (Tbb) variation over the Indian Ocean. The results indicate the following: 1) the scintillation occurrence and Tbb variation are modulated by planetary waves with periods from a few days to several tens of days, and 2) the scintillation tend to be enhanced when high and low Tbb regions appear in the west of Kototabang, suggesting that plasma bubbles may be seeded by atmospheric gravity waves propagating upward from the troposphere.

我们在印度尼西亚、日本和澳大利亚进行了电离层和热层的地面观测。我们特别注意赤道F区电离层和热层中100-1000 km尺度的扰动，即，中尺度电离层扰动（MSTIDS）和等离子体气泡。在印度尼西亚Kototabang用630 nm全天空成像仪探测到的MSTID出现在赤道F区异常峰的内部和南部，5月和6月发生率较高，平均向南的相速度为300 m/s，波长为700 km。以约100 m/s向东移动的等离子体气泡具有约100 km的尺度，间距为200-250 km，并且嵌入在等离子体结构中，东西尺度约为1000 km。MSTID和巨大的等离子体泡可以在日本和澳大利亚的低中纬度地区同时检测到，这些地区由地磁场线连接，并且在两个半球的外观非常相同。在Kototabang对与等离子体气泡有关的全球定位系统无线电波的赤道电离层振荡进行了持续监测。它们主要出现在春分月的日落至午夜，这是赤道等离子体泡出现的一个特征。为了研究赤道上空电离层/热层和对流层之间可能的动力学耦合，我们比较了印度洋上空的闪烁活动和地球亮温（Tbb）的变化。结果表明：（1）闪烁的发生和Tbb的变化受周期为几天到几十天的行星波的调制;（2）当Kototabang以西出现高Tbb区和低Tbb区时，闪烁有增强的趋势，表明等离子体泡可能是由对流层向上传播的大气重力波播种的。

项目成果

日本上空を伝搬する電離圏全電子数変動のGPS受信機網による観測

使用 GPS 接收器网络观测日本上空传播的电离层总电子数波动

• 发表时间: 2006
• 作者: Gurubaran;S.;Rajaram;R.;Nakamura;T.;Tsuda;T;Sasaki S;齊藤昭則
• 通讯作者: 齊藤昭則

Relation between plasma bubble generation and gravity waes in the troposphere

对流层等离子体气泡产生与重力场的关系

• 发表时间: 2006
• 作者: Ogawa T.;Y. Otsuka;K. Shiokawa;T. Nakamura;T. Tsuda
• 通讯作者: T. Tsuda

Propagation characteristics of nighttime mesospheric and thermospheric waves observed by optical mesosphere thermosphere imagers at middle and low latitudes

• DOI: 10.1186/bf03353165
• 发表时间: 2009-05
• 期刊: Earth, Planets and Space
• 作者: K. Shiokawa;Y. Otsuka;T. Ogawa

Ionospheric total electron content variations after the Sumatra earthquake of December 26, 2004

2004年12月26日苏门答腊岛地震后电离层总电子含量变化

• 发表时间: 2005
• 作者: Otsuka;Y.;N. Kotake;T. Tsugawa;K. Shiokawa;T. Ogawa;Effendy;T. Saito;M. Kawamura;T. Maruyama;N. Hemmakorn;T. Komolmis
• 通讯作者: T. Komolmis

Shiokawa, K.: "Ground and satellite observations of nighttime medium-scale traveling ionospheric disturbance at midlatitude"J.Geophys.Res.. 108(A1). 1052,2002JA009491 (2003)

Shiokawa, K.：“中纬度地区夜间中尺度移动电离层扰动的地面和卫星观测”J.Geophys.Res.108(A1)。