Electron acceleration signatures in the magnetotail associated with substorms
We present Cluster multisatellite observations of accelerated electrons in the near‐Earth magnetotail associated with substorms. We found that the hardest electron energy spectra appear in the earliest stage of substorm expansion in the near‐Earth tail region and that they gradually become softer du...
Gespeichert in:
Veröffentlicht in: | Journal of Geophysical Research: Space Physics 2010-05, Vol.115 (A5), p.n/a |
---|---|
Hauptverfasser: | , , , , , , , , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
container_end_page | n/a |
---|---|
container_issue | A5 |
container_start_page | |
container_title | Journal of Geophysical Research: Space Physics |
container_volume | 115 |
creator | Asano, Y. Shinohara, I. Retinò, A. Daly, P. W. Kronberg, E. A. Takada, T. Nakamura, R. Khotyaintsev, Y. V. Vaivads, A. Nagai, T. Baumjohann, W. Fazakerley, A. N. Owen, C. J. Miyashita, Y. Lucek, E. A. Rème, H. |
description | We present Cluster multisatellite observations of accelerated electrons in the near‐Earth magnetotail associated with substorms. We found that the hardest electron energy spectra appear in the earliest stage of substorm expansion in the near‐Earth tail region and that they gradually become softer during the events. Enhancement of the high‐energy electron flux occurs generally associated with the bulk acceleration of ions (fast flow) and electrons. It is also shown that the high‐energy electrons sometimes show preferential perpendicular acceleration associated with the temporal enhancement of the normal component of the magnetic field, and then the anisotropic distribution quickly becomes isotropic. During the dipolarization interval, in which no convection signature is observed, perpendicular flux drops to less than the initial value, and the parallel flux is more than the perpendicular flux. The results suggest that the electron acceleration mechanism is mostly consistent with adiabatic betatron acceleration, while Fermi acceleration is not clear in the high‐energy part. The effect of the pitch angle scattering is also important. The dispersive signature of the high‐energy electron flux indicates fast dawnward drift loss, namely, the three‐dimensional effect of the limited plasma acceleration region. |
doi_str_mv | 10.1029/2009JA014587 |
format | Article |
fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_journals_860602187</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>2313418771</sourcerecordid><originalsourceid>FETCH-LOGICAL-c5319-9f0f515f1c7fe1c873f697b2df106080aca61a72432fa6be9491b1c5c2237c8e3</originalsourceid><addsrcrecordid>eNp9kE9LAzEQxYMoWKo3P8AieHM1md0km2ORuipVQRTBS5jGRKPbXU1S1G9vpEU8OZf5w3u_gUfIHqNHjII6BkrVxYSymjdyg4yAcVECUNgko3xsSgogt8lujC80V81FTdmIXE47a1IY-gKNsZ0NmHxeon_qMS2DjYXvi_RsiwU-9TYNCX1XYIyD8ZjsY_Hh03MRl_OYhrCIO2TLYRft7rqPyd3p9PbkrJxdt-cnk1lpeMVUqRx1nHHHjHSWmUZWTig5h0fHqKANRYOCoYS6AodiblWt2JwZbgAqaRpbjcn-ivsWhveljUm_DMvQ55e6ERkBLDPH5HAlMmGIMVin34JfYPjSjOqfyPTfyLL8YM3EaLBzAXvj468HQMlaQJN11Ur34Tv79S9TX7Q3E8izyq5y5fIx2c9fF4ZXLWQlub6_avXDjLW8vpS6rb4ByCyIkw</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>860602187</pqid></control><display><type>article</type><title>Electron acceleration signatures in the magnetotail associated with substorms</title><source>Wiley Journals</source><source>Wiley Free Content</source><source>Wiley-Blackwell AGU Digital Library</source><source>Alma/SFX Local Collection</source><creator>Asano, Y. ; Shinohara, I. ; Retinò, A. ; Daly, P. W. ; Kronberg, E. A. ; Takada, T. ; Nakamura, R. ; Khotyaintsev, Y. V. ; Vaivads, A. ; Nagai, T. ; Baumjohann, W. ; Fazakerley, A. N. ; Owen, C. J. ; Miyashita, Y. ; Lucek, E. A. ; Rème, H.</creator><creatorcontrib>Asano, Y. ; Shinohara, I. ; Retinò, A. ; Daly, P. W. ; Kronberg, E. A. ; Takada, T. ; Nakamura, R. ; Khotyaintsev, Y. V. ; Vaivads, A. ; Nagai, T. ; Baumjohann, W. ; Fazakerley, A. N. ; Owen, C. J. ; Miyashita, Y. ; Lucek, E. A. ; Rème, H.</creatorcontrib><description>We present Cluster multisatellite observations of accelerated electrons in the near‐Earth magnetotail associated with substorms. We found that the hardest electron energy spectra appear in the earliest stage of substorm expansion in the near‐Earth tail region and that they gradually become softer during the events. Enhancement of the high‐energy electron flux occurs generally associated with the bulk acceleration of ions (fast flow) and electrons. It is also shown that the high‐energy electrons sometimes show preferential perpendicular acceleration associated with the temporal enhancement of the normal component of the magnetic field, and then the anisotropic distribution quickly becomes isotropic. During the dipolarization interval, in which no convection signature is observed, perpendicular flux drops to less than the initial value, and the parallel flux is more than the perpendicular flux. The results suggest that the electron acceleration mechanism is mostly consistent with adiabatic betatron acceleration, while Fermi acceleration is not clear in the high‐energy part. The effect of the pitch angle scattering is also important. The dispersive signature of the high‐energy electron flux indicates fast dawnward drift loss, namely, the three‐dimensional effect of the limited plasma acceleration region.</description><identifier>ISSN: 0148-0227</identifier><identifier>ISSN: 2169-9380</identifier><identifier>EISSN: 2156-2202</identifier><identifier>EISSN: 2169-9402</identifier><identifier>DOI: 10.1029/2009JA014587</identifier><language>eng</language><publisher>Washington, DC: Blackwell Publishing Ltd</publisher><subject>acceleration ; Atmospheric sciences ; Earth sciences ; Earth, ocean, space ; electron ; Exact sciences and technology ; Fluctuations ; Magnetic fields ; Magnetism ; Plasma physics ; Space ; substorm</subject><ispartof>Journal of Geophysical Research: Space Physics, 2010-05, Vol.115 (A5), p.n/a</ispartof><rights>Copyright 2010 by the American Geophysical Union.</rights><rights>2015 INIST-CNRS</rights><rights>Copyright 2010 by American Geophysical Union</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c5319-9f0f515f1c7fe1c873f697b2df106080aca61a72432fa6be9491b1c5c2237c8e3</citedby><cites>FETCH-LOGICAL-c5319-9f0f515f1c7fe1c873f697b2df106080aca61a72432fa6be9491b1c5c2237c8e3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1029%2F2009JA014587$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1029%2F2009JA014587$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,1433,11514,27924,27925,45574,45575,46409,46468,46833,46892</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=22974628$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Asano, Y.</creatorcontrib><creatorcontrib>Shinohara, I.</creatorcontrib><creatorcontrib>Retinò, A.</creatorcontrib><creatorcontrib>Daly, P. W.</creatorcontrib><creatorcontrib>Kronberg, E. A.</creatorcontrib><creatorcontrib>Takada, T.</creatorcontrib><creatorcontrib>Nakamura, R.</creatorcontrib><creatorcontrib>Khotyaintsev, Y. V.</creatorcontrib><creatorcontrib>Vaivads, A.</creatorcontrib><creatorcontrib>Nagai, T.</creatorcontrib><creatorcontrib>Baumjohann, W.</creatorcontrib><creatorcontrib>Fazakerley, A. N.</creatorcontrib><creatorcontrib>Owen, C. J.</creatorcontrib><creatorcontrib>Miyashita, Y.</creatorcontrib><creatorcontrib>Lucek, E. A.</creatorcontrib><creatorcontrib>Rème, H.</creatorcontrib><title>Electron acceleration signatures in the magnetotail associated with substorms</title><title>Journal of Geophysical Research: Space Physics</title><addtitle>J. Geophys. Res</addtitle><description>We present Cluster multisatellite observations of accelerated electrons in the near‐Earth magnetotail associated with substorms. We found that the hardest electron energy spectra appear in the earliest stage of substorm expansion in the near‐Earth tail region and that they gradually become softer during the events. Enhancement of the high‐energy electron flux occurs generally associated with the bulk acceleration of ions (fast flow) and electrons. It is also shown that the high‐energy electrons sometimes show preferential perpendicular acceleration associated with the temporal enhancement of the normal component of the magnetic field, and then the anisotropic distribution quickly becomes isotropic. During the dipolarization interval, in which no convection signature is observed, perpendicular flux drops to less than the initial value, and the parallel flux is more than the perpendicular flux. The results suggest that the electron acceleration mechanism is mostly consistent with adiabatic betatron acceleration, while Fermi acceleration is not clear in the high‐energy part. The effect of the pitch angle scattering is also important. The dispersive signature of the high‐energy electron flux indicates fast dawnward drift loss, namely, the three‐dimensional effect of the limited plasma acceleration region.</description><subject>acceleration</subject><subject>Atmospheric sciences</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>electron</subject><subject>Exact sciences and technology</subject><subject>Fluctuations</subject><subject>Magnetic fields</subject><subject>Magnetism</subject><subject>Plasma physics</subject><subject>Space</subject><subject>substorm</subject><issn>0148-0227</issn><issn>2169-9380</issn><issn>2156-2202</issn><issn>2169-9402</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNp9kE9LAzEQxYMoWKo3P8AieHM1md0km2ORuipVQRTBS5jGRKPbXU1S1G9vpEU8OZf5w3u_gUfIHqNHjII6BkrVxYSymjdyg4yAcVECUNgko3xsSgogt8lujC80V81FTdmIXE47a1IY-gKNsZ0NmHxeon_qMS2DjYXvi_RsiwU-9TYNCX1XYIyD8ZjsY_Hh03MRl_OYhrCIO2TLYRft7rqPyd3p9PbkrJxdt-cnk1lpeMVUqRx1nHHHjHSWmUZWTig5h0fHqKANRYOCoYS6AodiblWt2JwZbgAqaRpbjcn-ivsWhveljUm_DMvQ55e6ERkBLDPH5HAlMmGIMVin34JfYPjSjOqfyPTfyLL8YM3EaLBzAXvj468HQMlaQJN11Ur34Tv79S9TX7Q3E8izyq5y5fIx2c9fF4ZXLWQlub6_avXDjLW8vpS6rb4ByCyIkw</recordid><startdate>201005</startdate><enddate>201005</enddate><creator>Asano, Y.</creator><creator>Shinohara, I.</creator><creator>Retinò, A.</creator><creator>Daly, P. W.</creator><creator>Kronberg, E. A.</creator><creator>Takada, T.</creator><creator>Nakamura, R.</creator><creator>Khotyaintsev, Y. V.</creator><creator>Vaivads, A.</creator><creator>Nagai, T.</creator><creator>Baumjohann, W.</creator><creator>Fazakerley, A. N.</creator><creator>Owen, C. J.</creator><creator>Miyashita, Y.</creator><creator>Lucek, E. A.</creator><creator>Rème, H.</creator><general>Blackwell Publishing Ltd</general><general>American Geophysical Union</general><scope>BSCLL</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7TG</scope><scope>7XB</scope><scope>88I</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>GNUQQ</scope><scope>H8D</scope><scope>HCIFZ</scope><scope>KL.</scope><scope>L7M</scope><scope>M2P</scope><scope>P5Z</scope><scope>P62</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>Q9U</scope></search><sort><creationdate>201005</creationdate><title>Electron acceleration signatures in the magnetotail associated with substorms</title><author>Asano, Y. ; Shinohara, I. ; Retinò, A. ; Daly, P. W. ; Kronberg, E. A. ; Takada, T. ; Nakamura, R. ; Khotyaintsev, Y. V. ; Vaivads, A. ; Nagai, T. ; Baumjohann, W. ; Fazakerley, A. N. ; Owen, C. J. ; Miyashita, Y. ; Lucek, E. A. ; Rème, H.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c5319-9f0f515f1c7fe1c873f697b2df106080aca61a72432fa6be9491b1c5c2237c8e3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2010</creationdate><topic>acceleration</topic><topic>Atmospheric sciences</topic><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>electron</topic><topic>Exact sciences and technology</topic><topic>Fluctuations</topic><topic>Magnetic fields</topic><topic>Magnetism</topic><topic>Plasma physics</topic><topic>Space</topic><topic>substorm</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Asano, Y.</creatorcontrib><creatorcontrib>Shinohara, I.</creatorcontrib><creatorcontrib>Retinò, A.</creatorcontrib><creatorcontrib>Daly, P. W.</creatorcontrib><creatorcontrib>Kronberg, E. A.</creatorcontrib><creatorcontrib>Takada, T.</creatorcontrib><creatorcontrib>Nakamura, R.</creatorcontrib><creatorcontrib>Khotyaintsev, Y. V.</creatorcontrib><creatorcontrib>Vaivads, A.</creatorcontrib><creatorcontrib>Nagai, T.</creatorcontrib><creatorcontrib>Baumjohann, W.</creatorcontrib><creatorcontrib>Fazakerley, A. N.</creatorcontrib><creatorcontrib>Owen, C. J.</creatorcontrib><creatorcontrib>Miyashita, Y.</creatorcontrib><creatorcontrib>Lucek, E. A.</creatorcontrib><creatorcontrib>Rème, H.</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Science Database (Alumni Edition)</collection><collection>Technology Research Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>Advanced Technologies & Aerospace Collection</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>Natural Science Collection</collection><collection>Earth, Atmospheric & Aquatic Science Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>ProQuest Central Student</collection><collection>Aerospace Database</collection><collection>SciTech Premium Collection</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Science Database</collection><collection>Advanced Technologies & Aerospace Database</collection><collection>ProQuest Advanced Technologies & Aerospace Collection</collection><collection>Earth, Atmospheric & Aquatic Science Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central Basic</collection><jtitle>Journal of Geophysical Research: Space Physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Asano, Y.</au><au>Shinohara, I.</au><au>Retinò, A.</au><au>Daly, P. W.</au><au>Kronberg, E. A.</au><au>Takada, T.</au><au>Nakamura, R.</au><au>Khotyaintsev, Y. V.</au><au>Vaivads, A.</au><au>Nagai, T.</au><au>Baumjohann, W.</au><au>Fazakerley, A. N.</au><au>Owen, C. J.</au><au>Miyashita, Y.</au><au>Lucek, E. A.</au><au>Rème, H.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Electron acceleration signatures in the magnetotail associated with substorms</atitle><jtitle>Journal of Geophysical Research: Space Physics</jtitle><addtitle>J. Geophys. Res</addtitle><date>2010-05</date><risdate>2010</risdate><volume>115</volume><issue>A5</issue><epage>n/a</epage><issn>0148-0227</issn><issn>2169-9380</issn><eissn>2156-2202</eissn><eissn>2169-9402</eissn><abstract>We present Cluster multisatellite observations of accelerated electrons in the near‐Earth magnetotail associated with substorms. We found that the hardest electron energy spectra appear in the earliest stage of substorm expansion in the near‐Earth tail region and that they gradually become softer during the events. Enhancement of the high‐energy electron flux occurs generally associated with the bulk acceleration of ions (fast flow) and electrons. It is also shown that the high‐energy electrons sometimes show preferential perpendicular acceleration associated with the temporal enhancement of the normal component of the magnetic field, and then the anisotropic distribution quickly becomes isotropic. During the dipolarization interval, in which no convection signature is observed, perpendicular flux drops to less than the initial value, and the parallel flux is more than the perpendicular flux. The results suggest that the electron acceleration mechanism is mostly consistent with adiabatic betatron acceleration, while Fermi acceleration is not clear in the high‐energy part. The effect of the pitch angle scattering is also important. The dispersive signature of the high‐energy electron flux indicates fast dawnward drift loss, namely, the three‐dimensional effect of the limited plasma acceleration region.</abstract><cop>Washington, DC</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2009JA014587</doi><tpages>19</tpages><oa>free_for_read</oa></addata></record> |
fulltext | fulltext |
identifier | ISSN: 0148-0227 |
ispartof | Journal of Geophysical Research: Space Physics, 2010-05, Vol.115 (A5), p.n/a |
issn | 0148-0227 2169-9380 2156-2202 2169-9402 |
language | eng |
recordid | cdi_proquest_journals_860602187 |
source | Wiley Journals; Wiley Free Content; Wiley-Blackwell AGU Digital Library; Alma/SFX Local Collection |
subjects | acceleration Atmospheric sciences Earth sciences Earth, ocean, space electron Exact sciences and technology Fluctuations Magnetic fields Magnetism Plasma physics Space substorm |
title | Electron acceleration signatures in the magnetotail associated with substorms |
url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-04T13%3A10%3A22IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Electron%20acceleration%20signatures%20in%20the%20magnetotail%20associated%20with%20substorms&rft.jtitle=Journal%20of%20Geophysical%20Research:%20Space%20Physics&rft.au=Asano,%20Y.&rft.date=2010-05&rft.volume=115&rft.issue=A5&rft.epage=n/a&rft.issn=0148-0227&rft.eissn=2156-2202&rft_id=info:doi/10.1029/2009JA014587&rft_dat=%3Cproquest_cross%3E2313418771%3C/proquest_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=860602187&rft_id=info:pmid/&rfr_iscdi=true |