Successive substorm expansions during a period of prolonged northward interplanetary magnetic field

Y. Miyashita; Y. Kamide; K. LiouC.‐C. WuA. IedaN. NishitaniS. MachidaY. SaitoT. Mukai

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Successive substorm expansions during a period of prolonged northward interplanetary magnetic field

机译：在一段连续的亚暴扩张长期向北行星际磁场

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We have studied successive substorm expansions that occurred in spite of a period of prolonged northward interplanetary magnetic field (IMF). After the northward IMF persisted for almost ～19 h, a series of 11 very weak to moderate substorm expansions occurred during the following 6‐h interval of northward IMF on 19 January 1998, separated from each other by a few tens of minutes. Most of these substorm expansions did not accompany significant changes of the solar wind and the IMF. As for typical substorms that occur under southward IMF conditions, spacecraft and ground‐based instruments observed auroral breakups and enhancements of the westward auroral electrojet and large‐scale convection in the ionosphere, together with plasmoids and dipolarizations in the magnetotail, in association with the substorm expansion onsets. These signatures suggest that the mechanism of substorm expansion onsets is the same as for typical substorms, even under prolonged northward IMF conditions. We suggest that the large IMF ∣B_y∣ affects large‐scale convection and energy accumulation in the magnetotail and that the enhanced convection due to the large IMF ∣B_y∣ effect and substorm expansions can be an important factor for the promotion of succeeding substorm expansion onsets.

机译：我们研究了连续亚暴扩张尽管一段时间的延长发生向北行星际磁场(IMF)。IMF向北后持续几乎~ 19h,一系列11很弱到中度的亚暴地理扩张发生在以下6 h间隔1998年1月19日国际货币基金组织(IMF)向北,由几十彼此分离分钟。不伴随太阳能的显著变化风和IMF。发生在南国际货币基金组织的条件下,飞船基于地理和地面仪器观察极光向西分手和增强的极光电喷流和大型规模的对流电离层等离子粒团和在一起在磁尾dipolarizations,协会与亚暴扩张发作。这些特征表明,机制亚暴扩张发作是一样的典型的亚暴的,即使在长期向北国际货币基金组织的条件。∣的话∣影响大尺度对流和能量在磁尾,积累增强对流的话由于大型国际货币基金组织(IMF)∣∣效果和亚暴是一个扩展成功的重要促进因素亚暴扩张发作。

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《Journal of Geophysical Research, A. Space Physics: JGR》 |2011年第9期|A09221:1-A09221:13|共13页
作者
Y. Miyashita; Y. Kamide; K. LiouC.‐C. WuA. IedaN. NishitaniS. MachidaY. SaitoT. Mukai;
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作者单位

Department of Geophysics, Kyoto University, Kyoto, Japan;

Solar‐Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan;

Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, JapanJohns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USASpace Science Division, Naval Research Laboratory, Washington, D. C., USA;

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正文语种英语
中图分类空间物理;
关键词
Magnetic force; Expansion; substormsPLASMOIDSINTERPLANETARY MAGNETIC FIELDS;

机译：磁力;扩展;亚风暴等离子体行星际磁场;

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Successive substorm expansions during a period of prolonged northward interplanetary magnetic field

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