Equatorial Ionospheric Scintillations and Zonal Irregularity Drifts Observed with Closely-Spaced GPS Receivers in Indonesia
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- OTSUKA Yuichi
- Solar-Terrestrial Environment Laboratory, Nagoya University, Toyokawa
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- SHIOKAWA Kazuo
- Solar-Terrestrial Environment Laboratory, Nagoya University, Toyokawa
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- OGAWA Tadahiko
- Solar-Terrestrial Environment Laboratory, Nagoya University, Toyokawa
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To investigate drift velocities of a few hundred meter-scale irregularities associated with equatorial plasma bubbles, we used three single-frequency GPS receivers at the Equatorial Atmosphere Radar (EAR) site at Kototabang, Indonesia (0.20°S, 100.32°E; geomagnetic latitude 10.6°S), since January 2003. The GPS receivers sampled GPS signal intensity at a rate of 20 Hz. Distances between the receivers were 116, 127, and 152 m. An analysis of scintillation index (S4) in two years (2003-2004) revealed that the scintillations often occurred between 2000-0100 LT at equinoxes and that their occurrence rate was higher during March-April than during September-October. Drift velocities of irregularities were measured using cross-correlation analysis with the time series of the GPS signal intensity obtained from the three receivers. From a statistical analysis of the drift velocities, the eastward component of drift velocity just after sunset is found to be greater during March-April than during September-October. Based on these results, for the first time, we suggest that the east-west component of plasma drift velocity (or vertical electric field) may be related to the evolution of plasma irregularities causing scintillations throughout the mechanism causing the prereversal enhancement of the eastward electric fields. The equinoctial asymmetry of the drift velocity could be attributed to the equinoctial asymmetry of neutral winds in the thermosphere.
収録刊行物
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- 気象集誌. 第2輯
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気象集誌. 第2輯 84A 343-351, 2006
公益社団法人 日本気象学会
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詳細情報 詳細情報について
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- CRID
- 1390282681479844352
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- NII論文ID
- 110004804558
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- NII書誌ID
- AA00702524
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- ISSN
- 21869057
- 00261165
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- NDL書誌ID
- 7975110
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- NDL-Digital
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可