| タイトル | Criteria of interplanetary parameters causing intense magnetic storms (Dst less than -100nT) |
| 本文（外部サイト） | http://hdl.handle.net/2060/19880006818 |
| 著者（英） | Gonzalez, Walter D.; Tsurutani, Bruce T. |
| 著者所属（英） | Instituto de Pesquisas Espaciais |
| 発行日 | 1987-08-01 |
| 言語 | eng |
| 内容記述 | Ten intense storms occurred during the 500 days of August 16, 1978 to December 28, 1979. From the analysis of ISEE-3 field and plasma data, it is found that the interplanetary cause of these storms are long-duration, large and negative IMF B sub Z events, associated with interplanetary duskward-electric fields greater than 5 mV/m. Because a one-to-one relationship was found between these interplanetary events and intense storms, it is suggested that these criteria can, in the future, be used as predictors of intense storms by an interplanetary monitor such as ISEE-3. These B sub Z events are found to occur in association with large amplitudes of the IMF magnitude within two days after the onset of either high-speed solar wind streams or of solar wind density enhancement events, giving important clues to their interplanetary origin. Some obvious possibilities will be discussed. The close proximity of B sub Z events and magnetic storms to the onset of high speed streams or density enhancement events is in sharp contrast to interplanetary Alfven waves and HILDCAA events previously reported, and thus the two interplanetary features corresponding geomagnetic responses can be thought of as being complementary in nature. An examination of opposite polarity B sub Z events with the same criteria show that their occurrence is similar both in number as well as in their relationship to interplanetary disturbances, and that they lead to low levels of geomagnetic activity. |
| NASA分類 | GEOPHYSICS |
| レポートNO | 88N16200
NASA-CR-182423
INPE-4306-PRE/1172
NAS 1.26:182423 |
| 権利 | No Copyright |
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