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http://ir.lib.ncu.edu.tw/handle/987654321/27503
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| 題名: | Recipe for predicting the IMF B-z polarity's change of direction following solar disturbances and at the onset of geomagnetic storms |
| 作者: | Wu,CC;Dryer,M;Smith,Z;Wu,ST;Lyu,LH |
| 貢獻者: | 太空科學研究所 |
| 關鍵詞: | INTERPLANETARY MAGNETIC-FIELD;MAGNETOSPHERE;WIND |
| 日期: | 1996 |
| 上傳時間: | 2010-06-29 18:39:51 (UTC+8) |
| 出版者: | 中央大學 |
| 摘要: | A three-dimensional, time-dependent, MHD model of solar-disturbance-caused storms (Wu, 1993; Wu et al., 1996a) is used to predict the turning direction of the interplanetary magnetic field (IMF) at Earth. More explicitly, we examine the polarity of B-z caused by solar disturbances on the Sun. Three manifestations of solar disturbances, as studied by previous workers, are examined. Firstly, twenty-nine kilometric Type II events, associated (Cane, 1985) with geomagnetic storms, are studied within the context of our three-dimensional model. Then, an additional. eleven long-duration X-ray events (LDEs) with radio fluxes greater than 100 solar flux units were examined; these events were not associated with interplanetary Type II events but were also associated (Cane, 1985) with geomagnetic storms. Finally, in situ interplanetary phenomena that caused ten large (Dst < -100 nT, the intensification of the storm) geomagnetic storm episodes (Tsurutani et al., 1988) near solar maximum are also studied via the B-z predictions of our 3D MHD model. The accuracy of these B-z turning-direction-predictions is found to be as follows: (1) for the kilometric Type II events, the model's prediction was successful for 26 of the 29 events studied; (2) 10/11 for the LDE events; and (3) 7/9 for the major geomagnetic storm events. The overall prediction accuracy of these three independent data sets is 43/49. Thus, consideration of these three independent data sets strongly suggests that the recipe proposed by the basic 3D MHD model may be valid for a zero-th order prediction scheme. Copyright (C) 1996 Elsevier Science Ltd |
| 關聯: | JOURNAL OF ATMOSPHERIC AND TERRESTRIAL PHYSICS |
| 顯示於類別: | [太空科學研究所 ] 期刊論文
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