Key features of intense geospace storms - A comparative study of a solar maximum and a solar minimum storm

被引：9
|
作者：
Daglis, I. A. [1 ]
Tsurutani, B. T.
Gonzalez, W. D.
Kozyra, J. U.
Orsini, S.
Cladis, J.
Kamide, Y.
Henderson, M. G.
Vassiliadis, D.
机构：
[1] Natl Observ Athens, Inst Space Applicat & Remote Sensing, Athens 15236, Greece
[2] CALTECH, Jet Propuls Lab, Pasadena, CA 91109 USA
[3] Inst Pesquisas Espaciais, BR-12201970 Sao Paulo, Brazil
[4] Univ Michigan, Space Phys Res Lab, Ann Arbor, MI 48109 USA
[5] CNR, Ist Fis Spazio Interplanetario, I-00133 Rome, Italy
[6] Lockheed Martin Space Phys Lab, Palo Alto, CA USA
[7] Nagoya Univ, Solar Terr Environm Lab, Toyokawa, Japan
[8] Los Alamos Natl Lab, Los Alamos, NM USA
[9] NASA Goddard Space Flight Ctr, USRA, Greenbelt, MD 20771 USA
来源：
PLANETARY AND SPACE SCIENCE | 2007年 / 55卷 / 1-2期
基金：
美国国家科学基金会; 美国国家航空航天局;
关键词：
storms and substorms; solar wind-magnetosphere interactions; magnetosphere-ionosphere interactions; magnetospheric configuration and dynamics; energetic particles; trapped; current systems; particle acceleration;
D O I：
10.1016/j.pss.2006.04.007
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
This paper addresses the question of particular causes and dynamical characteristics of intense geospace storms through the comparative study of two specific examples: a solar maximum storm (4-6 June 1991) and a solar minimum storm (24-26 September 1998). We concentrate on issues pertaining to the origin, development, dynamical evolution and recovery of intense storms. The comparative study addresses the solar and interplanetary drivers, the ring current composition and its implications, the storm-substorm relationship, and the ring current decay. Our aim has been to identify features assumed common or repeatable and to elaborate on similarities or differences between two intense storms that are separated by 7 years and which occurred in different phases of the solar cycle. In view of planetary exploration, which is becoming the focus of space science both in the US and in Europe, classifying the drivers and parameters of solar-planetary connection is of particular interest. Solar system exploration will undoubtedly benefit from detailed knowledge of the conditions leading to intense geospace storms. The main conclusions of this paper can be listed as follows. More intense solar events do not necessarily result in more intense geospace storms. Storm development is driven by the appropriate interplanetary conditions; however, storm evolution is not defined by interplanetary conditions alone, but also by internal magnetospheric conditions - namely plasma sheet density and ion composition. Storm dynamics may also be modified by solar wind pressure. Magnetosphere-ionosphere coupling in the form of ionospheric outflow during storms presumably is the key to substorm, influence on storm dynamics; i.e., substorms influence storm development substantially, whenever they drive intense outflow of ionospheric-origin O+ ions into the magnetosphere. In particular, substorm-driven O+ outflow is one of the main features of intense storms. (c) 2006 Elsevier Ltd. All rights reserved.
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页码：32 / 52
页数：21
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