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Multiple X line reconnection: 1. A criterion for the transition from a single X line to a multiple X line reconnection

Identifieur interne : 002631 ( Istex/Corpus ); précédent : 002630; suivant : 002632

Multiple X line reconnection: 1. A criterion for the transition from a single X line to a multiple X line reconnection

Auteurs : L. C. Lee ; Z. F. Fu

Source :

RBID : ISTEX:1F992218258B52E9C4DE8BCE0722FA7C11BFC89E

Abstract

In an earlier paper we suggested that the multiple X line reconnection process may occur at the dayside magnetopause and lead to the occurrence of flux transfer events. In a series of papers we shall examine in detail various aspects of the multiple X line reconnection processes. In the present paper, the first of the series, we attempt to obtain a criterion for the transition from the classical single X line reconnection to the multiple X line reconnection based on a two‐dimensional simulation model. It is found that the development of tearing instability in the diffusion region of the reconnection configuration may lead to the formation of magnetic islands and hence to the occurrence of multiple X line reconnection. The criterion for the tearing instability is found to be l/δ > 7 coth (8/S0.5), where S is the Lundquist number based on the width of the diffusion region, l is the half‐length, and δ the half‐width of the diffusion region. Furthermore, a formula is obtained for the dependence of the ratio l/δ on the system length Lz, the imposed reconnection rate R0, and the resistivity η. The ratio l/δ is found to increase with an increasing system length Lz, an increasing imposed reconnection rate R0, and a decreasing resistivity η. Therefore the multiple X line reconnection process tends to occur when the system length is long, the reconnection rate is high, or the resistivity is small.

Url:
DOI: 10.1029/JA091iA06p06807

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ISTEX:1F992218258B52E9C4DE8BCE0722FA7C11BFC89E

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<abstract>In an earlier paper we suggested that the multiple X line reconnection process may occur at the dayside magnetopause and lead to the occurrence of flux transfer events. In a series of papers we shall examine in detail various aspects of the multiple X line reconnection processes. In the present paper, the first of the series, we attempt to obtain a criterion for the transition from the classical single X line reconnection to the multiple X line reconnection based on a two‐dimensional simulation model. It is found that the development of tearing instability in the diffusion region of the reconnection configuration may lead to the formation of magnetic islands and hence to the occurrence of multiple X line reconnection. The criterion for the tearing instability is found to be l/δ > 7 coth (8/S0.5), where S is the Lundquist number based on the width of the diffusion region, l is the half‐length, and δ the half‐width of the diffusion region. Furthermore, a formula is obtained for the dependence of the ratio l/δ on the system length Lz, the imposed reconnection rate R0, and the resistivity η. The ratio l/δ is found to increase with an increasing system length Lz, an increasing imposed reconnection rate R0, and a decreasing resistivity η. Therefore the multiple X line reconnection process tends to occur when the system length is long, the reconnection rate is high, or the resistivity is small.</abstract>
<relatedItem type="host">
<titleInfo>
<title>Journal of Geophysical Research: Space Physics</title>
</titleInfo>
<titleInfo type="abbreviated">
<title>J. Geophys. Res.</title>
</titleInfo>
<genre type="journal">journal</genre>
<subject>
<genre>index-terms</genre>
<topic authorityURI="http://psi.agu.org/taxonomy5/2700">MAGNETOSPHERIC PHYSICS</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/2706">Cusp</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/2724">Magnetopause and boundary layers</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/2744">Magnetotail</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/2784">Solar wind/magnetosphere interactions</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/2723">Magnetic reconnection</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/7500">SOLAR PHYSICS, ASTROPHYSICS, AND ASTRONOMY</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/7526">Magnetic reconnection</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/7800">SPACE PLASMA PHYSICS</topic>
<topic authorityURI="http://psi.agu.org/taxonomy5/7835">Magnetic reconnection</topic>
</subject>
<identifier type="ISSN">0148-0227</identifier>
<identifier type="eISSN">2156-2202</identifier>
<identifier type="DOI">10.1002/(ISSN)2156-2202a</identifier>
<identifier type="CODEN">JGREA2</identifier>
<identifier type="PublisherID">JGRA</identifier>
<part>
<date>1986</date>
<detail type="volume">
<caption>vol.</caption>
<number>91</number>
</detail>
<detail type="issue">
<caption>no.</caption>
<number>A6</number>
</detail>
<extent unit="pages">
<start>6807</start>
<end>6815</end>
<total>9</total>
</extent>
</part>
</relatedItem>
<identifier type="istex">1F992218258B52E9C4DE8BCE0722FA7C11BFC89E</identifier>
<identifier type="DOI">10.1029/JA091iA06p06807</identifier>
<identifier type="ArticleID">5A8245</identifier>
<accessCondition type="use and reproduction" contentType="copyright">Copyright 1986 by the American Geophysical Union.</accessCondition>
<recordInfo>
<recordContentSource>WILEY</recordContentSource>
</recordInfo>
</mods>
</metadata>
<serie></serie>
</istex>
</record>

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   |texte=   Multiple X line reconnection: 1. A criterion for the transition from a single X line to a multiple X line reconnection
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