Characteristics of solar flare effect in the high-latitude ionosphere as observed by the SuperDARN radars
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- Hosokawa Keisuke
- Department of Geophysics, Graduate School of Science, Kyoto University
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- Iyemori Toshihiko
- Data Analysis Center for Geomagnetism Kyoto, Graduate School of Science, Kyoto University
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- Yukimatu Akira Sessai
- National Institute of Polar Reserch
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- Sato Natsuo
- National Institute of Polar Reserch
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抄録
Sudden perturbations of the ground magnetic fields at solar flares are called geomagnetic Solar Flare Effect (SFE). An SFE is the extra ionization produced by the X-ray emission from a solar flare. We analyzed 10 intense SFE events from 1996 to 1998 using SuperDARN HF radar network and other instruments located in the northern hemisphere. Two typical ionospheric signatures associated with the solar flares are revealed, one is a sudden fade-out of backscatter echoes, and the other is an appearance or variation of field-aligned irregularities. Sudden fade-out is observed only in the sunlit hemisphere, and the appearance or variation of irregularities are observed only near the terminator. In addition, we investigated one event out of ten in detail and found that there exists a discontinuity of the electric field or conductivity around the irregularity. This fact suggests that the variation of conductivity or electric field in the E region could affect the irregularity formation in the F region.
収録刊行物
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- Advances in polar upper atmosphere research
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Advances in polar upper atmosphere research 14 66-75, 2000-08
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詳細情報
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- CRID
- 1571417126783413120
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- NII論文ID
- 110000037518
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- NII書誌ID
- AA11397422
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- ISSN
- 13451065
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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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- CiNii Articles