Stopping flow bursts and their role in the generation of the substorm current wedge
During two flow burst events, earthward propagating dipolarization/injection fronts (DF) fortuitously stopped at ~9Re within a unique, compact multispacecraft constellation for the duration of a 30 min long substorm current wedge‐related dipolarization. Observations inside and outside the halted flo...
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Veröffentlicht in: | Geophysical research letters 2014-02, Vol.41 (4), p.1106-1112 |
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creator | Sergeev, V. A. Chernyaev, I. A. Angelopoulos, V. Runov, A. V. Nakamura, R. |
description | During two flow burst events, earthward propagating dipolarization/injection fronts (DF) fortuitously stopped at ~9Re within a unique, compact multispacecraft constellation for the duration of a 30 min long substorm current wedge‐related dipolarization. Observations inside and outside the halted flow burst indicate that it retained properties (including a narrow DF, a localized compression region ahead of it, and its structured, low density, low entropy (pV5/3) content) when arrived at its stopping point, where the entropy of the ambient plasma was nearly equal to that of the flow burst. We show that even short‐duration flow bursts can significantly modify pressure and entropy distributions in the inner magnetosphere. The new distribution takes a long time to relax (a few tens of minutes, consistent with substorm recovery time scales). We argue that these pressure and entropy changes resulting from the incoming flow bursts can be responsible for the support/generation of a substorm current wedge.
Key Points
Flow burst stops where its entropy is nearly equal to entropy of ambient plasmaFlow burst modifies pressure and entropy distribution in the inner magnetosphereLong relaxation time after the FB subsided provides long‐duration SCW effects |
doi_str_mv | 10.1002/2014GL059309 |
format | Article |
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Key Points
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Key Points
Flow burst stops where its entropy is nearly equal to entropy of ambient plasmaFlow burst modifies pressure and entropy distribution in the inner magnetosphereLong relaxation time after the FB subsided provides long‐duration SCW effects</description><subject>Bursts</subject><subject>Compressing</subject><subject>Constellations</subject><subject>Density</subject><subject>dipolarization</subject><subject>Entropy</subject><subject>Flow</subject><subject>flow burst</subject><subject>Magnetism</subject><subject>magnetotail</subject><subject>Plugs</subject><subject>Stress concentration</subject><subject>substorm current wedge</subject><subject>Wedges</subject><issn>0094-8276</issn><issn>1944-8007</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNqF0UtP3DAQB3ALgdTlcesHsMSFQwMzfq6PFWoXxIo3LTfLSZwlkI23dqKFb09gUYU4wGk81u8_0mgI-Y6wjwDsgAGKyRSk4WDWyAiNENkYQK-TEYAZ3kyrb2QzpXsA4MBxRK6uurBY1O2MVk1Y0ryPqUvUtSXt7nwdaQyNp3X70tGZb310XR1aGqrXn9TnqQtxTos-Rt92dOnLmd8mG5Vrkt95q1vk5vev68OjbHo2OT78Oc0KgYBZYRhzyIoidzo33FQsLwUaqSUwJZz0Y20qrGTOSjE2UuUoUOpxKb1y2hjBt8jeau4ihn-9T52d16nwTeNaH_pkUWmUQik0X1PJjOHINB_o7gd6H_rYDosMAwUDqbVQg_qxUkUMKUVf2UWs5y4-WQT7cgz7_hgDZyu-rBv_9Km1k8upRG5wCGWrUJ06__g_5OKDVZpraf-eTuz57ekfcXIhrebPu9iXlg</recordid><startdate>20140228</startdate><enddate>20140228</enddate><creator>Sergeev, V. A.</creator><creator>Chernyaev, I. A.</creator><creator>Angelopoulos, V.</creator><creator>Runov, A. V.</creator><creator>Nakamura, R.</creator><general>Blackwell Publishing Ltd</general><general>John Wiley & Sons, Inc</general><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7TN</scope><scope>8FD</scope><scope>F1W</scope><scope>FR3</scope><scope>H8D</scope><scope>H96</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope><scope>L7M</scope></search><sort><creationdate>20140228</creationdate><title>Stopping flow bursts and their role in the generation of the substorm current wedge</title><author>Sergeev, V. A. ; Chernyaev, I. A. ; Angelopoulos, V. ; Runov, A. V. ; Nakamura, R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4101-c922a12ccba7b939f2bd4195750264a5e879f1f5b2d48956b141578d5e6a79943</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Bursts</topic><topic>Compressing</topic><topic>Constellations</topic><topic>Density</topic><topic>dipolarization</topic><topic>Entropy</topic><topic>Flow</topic><topic>flow burst</topic><topic>Magnetism</topic><topic>magnetotail</topic><topic>Plugs</topic><topic>Stress concentration</topic><topic>substorm current wedge</topic><topic>Wedges</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sergeev, V. A.</creatorcontrib><creatorcontrib>Chernyaev, I. A.</creatorcontrib><creatorcontrib>Angelopoulos, V.</creatorcontrib><creatorcontrib>Runov, A. V.</creatorcontrib><creatorcontrib>Nakamura, R.</creatorcontrib><collection>Istex</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Technology Research Database</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</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>Sergeev, V. A.</au><au>Chernyaev, I. A.</au><au>Angelopoulos, V.</au><au>Runov, A. V.</au><au>Nakamura, R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Stopping flow bursts and their role in the generation of the substorm current wedge</atitle><jtitle>Geophysical research letters</jtitle><addtitle>Geophys. Res. Lett</addtitle><date>2014-02-28</date><risdate>2014</risdate><volume>41</volume><issue>4</issue><spage>1106</spage><epage>1112</epage><pages>1106-1112</pages><issn>0094-8276</issn><eissn>1944-8007</eissn><abstract>During two flow burst events, earthward propagating dipolarization/injection fronts (DF) fortuitously stopped at ~9Re within a unique, compact multispacecraft constellation for the duration of a 30 min long substorm current wedge‐related dipolarization. Observations inside and outside the halted flow burst indicate that it retained properties (including a narrow DF, a localized compression region ahead of it, and its structured, low density, low entropy (pV5/3) content) when arrived at its stopping point, where the entropy of the ambient plasma was nearly equal to that of the flow burst. We show that even short‐duration flow bursts can significantly modify pressure and entropy distributions in the inner magnetosphere. The new distribution takes a long time to relax (a few tens of minutes, consistent with substorm recovery time scales). We argue that these pressure and entropy changes resulting from the incoming flow bursts can be responsible for the support/generation of a substorm current wedge.
Key Points
Flow burst stops where its entropy is nearly equal to entropy of ambient plasmaFlow burst modifies pressure and entropy distribution in the inner magnetosphereLong relaxation time after the FB subsided provides long‐duration SCW effects</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1002/2014GL059309</doi><tpages>7</tpages></addata></record> |
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source | Wiley Online Library Journals; Free E-Journal (出版社公開部分のみ); Wiley-Blackwell AGU Digital Archive; Wiley Open Access |
subjects | Bursts Compressing Constellations Density dipolarization Entropy Flow flow burst Magnetism magnetotail Plugs Stress concentration substorm current wedge Wedges |
title | Stopping flow bursts and their role in the generation of the substorm current wedge |
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