MHD ballooning instability in the plasma sheet
Based on the ideal MHD model the stability of ballooning modes is investigated by employing realistic 3D magnetospheric equilibria for the substorm growth phase. Our results show that without making compressibility approximations the ballooning modes are unstable for the entire plasma sheet where th...
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| Veröffentlicht in: | Geophysical research letters 2004-03, Vol.31 (6), p.L06809.1-n/a |
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| creator | Cheng, C. Z. Zaharia, S. |
| description | Based on the ideal MHD model the stability of ballooning modes is investigated by employing realistic 3D magnetospheric equilibria for the substorm growth phase. Our results show that without making compressibility approximations the ballooning modes are unstable for the entire plasma sheet where the equatorial βeq ≥ 1, and the most unstable modes are located in the strong cross‐tail current sheet region in the near‐Earth plasma sheet, which maps to the initial brightening location of the breakup arc in the ionosphere. However, the MHD βeq threshold is too low in comparison with observations by AMPTE/CCE, which show that prior to substorm onset a low frequency instability is excited only when βeq > 50. The difficulty can be mitigated by including kinetic effects, which greatly increase the stabilizing effects of field line tension and can enhance the βeq threshold to limit the unstable region to the cross‐tail current sheet region. |
| doi_str_mv | 10.1029/2003GL018823 |
| format | Article |
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The difficulty can be mitigated by including kinetic effects, which greatly increase the stabilizing effects of field line tension and can enhance the βeq threshold to limit the unstable region to the cross‐tail current sheet region.</description><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><issn>0094-8276</issn><issn>1944-8007</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2004</creationdate><recordtype>article</recordtype><recordid>eNqFkDFPwzAQhS0EEqWw8QOywETKnZ048QiFtkilSAgEm-UYGwxuUuIg6L_HVREwwXRv-N67d0fIPsIAgYpjCsDGU8CypGyD9FBkWVoCFJukByCipgXfJjshPEMkgWGPDC4nZ0mlvG-a2tWPiatDpyrnXbeMOumeTLLwKsxVEp6M6XbJllU-mL2v2Se3o_Ob4SSdXo0vhifTVOdIMeWm0rlFFFWuH5gtUPDcQBU7Ztao3HLBKqpsWeqMa6ZBx3aMV6gy8WCBWdYnh-vcRdu8vpnQybkL2nivatO8BUnjhRmI4l8QS2CCcxbBozWo2yaE1li5aN1ctUuJIFffk7-_F_GDr1wVtPK2VbV24ceTFxlSvtpP19y782b5Z6YcX0-xKBCjKV2bXOjMx7dJtS8yRha5vJuN5Wh2ep-z0bUU7BMb0Ipz</recordid><startdate>200403</startdate><enddate>200403</enddate><creator>Cheng, C. 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Z.</creatorcontrib><creatorcontrib>Zaharia, S.</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Geophysical research letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Cheng, C. Z.</au><au>Zaharia, S.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>MHD ballooning instability in the plasma sheet</atitle><jtitle>Geophysical research letters</jtitle><addtitle>Geophys. Res. Lett</addtitle><date>2004-03</date><risdate>2004</risdate><volume>31</volume><issue>6</issue><spage>L06809.1</spage><epage>n/a</epage><pages>L06809.1-n/a</pages><issn>0094-8276</issn><eissn>1944-8007</eissn><coden>GPRLAJ</coden><abstract>Based on the ideal MHD model the stability of ballooning modes is investigated by employing realistic 3D magnetospheric equilibria for the substorm growth phase. Our results show that without making compressibility approximations the ballooning modes are unstable for the entire plasma sheet where the equatorial βeq ≥ 1, and the most unstable modes are located in the strong cross‐tail current sheet region in the near‐Earth plasma sheet, which maps to the initial brightening location of the breakup arc in the ionosphere. However, the MHD βeq threshold is too low in comparison with observations by AMPTE/CCE, which show that prior to substorm onset a low frequency instability is excited only when βeq > 50. The difficulty can be mitigated by including kinetic effects, which greatly increase the stabilizing effects of field line tension and can enhance the βeq threshold to limit the unstable region to the cross‐tail current sheet region.</abstract><cop>Washington, DC</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2003GL018823</doi><tpages>4</tpages><oa>free_for_read</oa></addata></record> |
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| source | Wiley Online Library Journals Frontfile Complete; Wiley Free Content; Wiley-Blackwell AGU Digital Library; EZB-FREE-00999 freely available EZB journals |
| subjects | Earth, ocean, space Exact sciences and technology |
| title | MHD ballooning instability in the plasma sheet |
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