The response of high‐latitude convection to a sudden southward IMF turning
書誌事項
- 公開日
- 1998-08
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1029/98gl02212
- 公開者
- American Geophysical Union (AGU)
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説明
<jats:p>We describe the response of the high‐latitude convection to a sudden southward turning of the IMF. In this event B<jats:sub>Z</jats:sub> recorded at the WIND satellite switched from +6 nT to −6 nT in 2½ minutes and effects in the ionosphere were observed by the SuperDARN HF radars. In the vicinity of noon MLT, the convection switched suddenly (∼2 min) from sunward to antisunward with the velocity change reaching magnitudes as great as 1500 m/s in about 6 minutes. Surprisingly, the responses at the other MLTs distributed from noon to midnight began at virtually the same time. Meridional flows near 22 MLT were observed to reverse direction in about 4 minutes with the velocity change reaching magnitudes as great as 750 m/s in about 8 minutes. This example shows that the convection can respond to a sudden IMF change practically simultaneously (∼2 min) over the entire high‐latitude zone and reconfigure from a pattern characteristic of B<jats:sub>Z</jats:sub><jats:sup>+</jats:sup> to one characteristic of B<jats:sub>Z</jats:sub><jats:sup>−</jats:sup> in a very short (2–4 min) time.</jats:p>
収録刊行物
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- Geophysical Research Letters
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Geophysical Research Letters 25 (15), 2913-2916, 1998-08
American Geophysical Union (AGU)
