Dependence of Pi2 Occurrence Probability on Solar Wind Parameters.

• Aoki Takao

  Nagano Technical High School

書誌事項

タイトル別名

• Dependence of Pi2 Occurrence Probabilit

抄録

In order to clarify the properties of substorm occurrence, we statistically examine the conditions for the occurrence of Pit pulsations at Memambetsu (geomagnetic latitude 34.6°) using solar wind hourly value data for the period 1965-1990. The main results are: The Pit occurrence probability increases roughly linearly with decreasing Bz component of the interplanetary magnetic field (IMF) for the range Bz < 4 nT. It also increases with increasing solar wind velocity (V); the probability is approximately proportional to V3.15, and the exponent for V becomes larger as the dipole tilt angle (χ) approaches zero. The probability is higher for positive By of the IMF than for negative By when χ is negative, and vice versa when χ is positive. The solar wind density (D) increases the probability; the probability is approximately proportional to D^0.814 The solar wind parameter dependence of the Pi2 occurrence probability shows a close similarity to that of the AL and am indices, which are considered to represent the substorm intensity, except for the density dependence. In order to understand the cause of the similarity, we suggest that the substorm occurrence probability is controlled by the rate of solar wind energy input into the magnetosphere and is enhanced as the rate increases.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　ｇｅｏｍａｇｎｅｔｉｓｍ　ａｎｄ　ｇｅｏｅｌｅｃｔｒｉｃｉｔｙ

  Ｊｏｕｒｎａｌ　ｏｆ　ｇｅｏｍａｇｎｅｔｉｓｍ　ａｎｄ　ｇｅｏｅｌｅｃｔｒｉｃｉｔｙ 48 (4), 371-389, 1996

  地球電磁気・地球惑星圏学会

キーワード

• General Earth and Planetary Sciences
• General Environmental Science

詳細情報

• CRID: 1390001206511468416
• NII論文ID: 130003423129
• NII論文ID: 10002201801
• NII書誌ID: AA00698879
• DOI: 10.5636/jgg.48.371
• ISSN: 21855765
• ISSN: 00221392
• NDL書誌ID: 4060342
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4060342
• 本文言語コード: en
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