Interhemispheric asymmetries in the occurrence of magnetically conjugate sub-auroral polarisation streams
Identifieur interne : 000583 ( Hal/Corpus ); précédent : 000582; suivant : 000584Interhemispheric asymmetries in the occurrence of magnetically conjugate sub-auroral polarisation streams
Auteurs : M. L. Parkinson ; M. Pinnock ; J. A. Wild ; M. Lester ; T. K. Yeoman ; S. E. Milan ; H. Ye ; J. C. Devlin ; H. U. Frey ; T. KikuchiSource :
- Annales Geophysicae [ 0992-7689 ] ; 2005-06-03.
Abstract
Earthward injections of energetic ions and electrons mark the onset of magnetospheric substorms. In the inner magnetosphere (L4), the energetic ions drift westward and the electrons eastward, thereby enhancing the equatorial ring current. Wave-particle interactions can accelerate these particles to radiation belt energies. The ions are injected slightly closer to Earth in the pre-midnight sector, leading to the formation of a radial polarisation field in the inner magnetosphere. This maps to a poleward electric field just equatorward of the auroral oval in the ionosphere. The poleward electric field is subsequently amplified by ionospheric feedback, thereby producing auroral westward flow channels (AWFCs). In terms of electric field strength, AWFCs are the strongest manifestation of substorms in the ionosphere. Because geomagnetic flux tubes are essentially equi-potentials, similar AWFC signatures should be observed simultaneously in the Northern and Southern Hemispheres. Here we present magnetically conjugate SuperDARN radar observations of AWFC activity observed in the pre-midnight sector during two substorm intervals including multiple onsets during the evening of 30 November 2002. The Northern Hemisphere observations were made with the Japanese radar located at King Salmon, Alaska (57, and the Southern Hemisphere observations with the Tasman International Geospace Environment Radar (TIGER) located at Bruny Island, Tasmania (55. LANL geosynchronous satellite observations of energetic ion and electron fluxes monitored the effects of substorms in the inner magnetosphere (L6). The radar-observed AWFC activity was coincident with activity observed at geosynchronous orbit, as well as westward current surges in the ionosphere observed using ground-based magnetometers. The location of AWFCs with respect to the auroral oval was inferred from FUV auroral images recorded on board the IMAGE spacecraft. DMSP SSIES ion drift measurements confirmed the presence of AWFCs equatorward of the auroral oval. Systematic asymmetries in the interhemispheric signatures of the AWFCs probably arose because the magnetic flux tubes were distorted at L shells passing close to the substorm dipolarisation region. Transient asymmetries were attributed to the development of nearby field-aligned potential drops and currents.
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<front><div type="abstract" xml:lang="en">Earthward injections of energetic ions and electrons mark the onset of magnetospheric substorms. In the inner magnetosphere (L4), the energetic ions drift westward and the electrons eastward, thereby enhancing the equatorial ring current. Wave-particle interactions can accelerate these particles to radiation belt energies. The ions are injected slightly closer to Earth in the pre-midnight sector, leading to the formation of a radial polarisation field in the inner magnetosphere. This maps to a poleward electric field just equatorward of the auroral oval in the ionosphere. The poleward electric field is subsequently amplified by ionospheric feedback, thereby producing auroral westward flow channels (AWFCs). In terms of electric field strength, AWFCs are the strongest manifestation of substorms in the ionosphere. Because geomagnetic flux tubes are essentially equi-potentials, similar AWFC signatures should be observed simultaneously in the Northern and Southern Hemispheres. Here we present magnetically conjugate SuperDARN radar observations of AWFC activity observed in the pre-midnight sector during two substorm intervals including multiple onsets during the evening of 30 November 2002. The Northern Hemisphere observations were made with the Japanese radar located at King Salmon, Alaska (57, and the Southern Hemisphere observations with the Tasman International Geospace Environment Radar (TIGER) located at Bruny Island, Tasmania (55. LANL geosynchronous satellite observations of energetic ion and electron fluxes monitored the effects of substorms in the inner magnetosphere (L6). The radar-observed AWFC activity was coincident with activity observed at geosynchronous orbit, as well as westward current surges in the ionosphere observed using ground-based magnetometers. The location of AWFCs with respect to the auroral oval was inferred from FUV auroral images recorded on board the IMAGE spacecraft. DMSP SSIES ion drift measurements confirmed the presence of AWFCs equatorward of the auroral oval. Systematic asymmetries in the interhemispheric signatures of the AWFCs probably arose because the magnetic flux tubes were distorted at L shells passing close to the substorm dipolarisation region. Transient asymmetries were attributed to the development of nearby field-aligned potential drops and currents.</div>
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<date type="whenProduced">2005-06-03</date>
<date type="whenEndEmbargoed">2005-06-03</date>
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<surname>EGU</surname>
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<idno type="halId">hal-00317737</idno>
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<idno type="halBibtex">parkinson:hal-00317737</idno>
<idno type="halRefHtml">Annales Geophysicae, European Geosciences Union, 2005, 23 (4), pp.1371-1390</idno>
<idno type="halRef">Annales Geophysicae, European Geosciences Union, 2005, 23 (4), pp.1371-1390</idno>
</publicationStmt>
<seriesStmt> <idno type="stamp" n="EGU">European Geosciences Union</idno>
<idno type="stamp" n="EGU-ANGEO" p="EGU">Annales Geophysicae</idno>
<idno type="stamp" n="INSU">INSU - Institut National des Sciences de l'Univers</idno>
<idno type="stamp" n="GIP-BE">GIP Bretagne Environnement</idno>
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<notesStmt> <note type="audience" n="2">International</note>
<note type="popular" n="0">No</note>
<note type="peer" n="1">Yes</note>
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<sourceDesc> <biblStruct> <analytic> <title xml:lang="en">Interhemispheric asymmetries in the occurrence of magnetically conjugate sub-auroral polarisation streams</title>
<author role="aut"> <persName> <forename type="first">M. L.</forename>
<surname>Parkinson</surname>
</persName>
<idno type="halauthorid">346164</idno>
<affiliation ref="#struct-71462"></affiliation>
</author>
<author role="aut"> <persName> <forename type="first">M.</forename>
<surname>Pinnock</surname>
</persName>
<idno type="halauthorid">345397</idno>
<affiliation ref="#struct-76974"></affiliation>
</author>
<author role="aut"> <persName> <forename type="first">J. A.</forename>
<surname>Wild</surname>
</persName>
<idno type="halauthorid">345805</idno>
<affiliation ref="#struct-71490"></affiliation>
</author>
<author role="aut"> <persName> <forename type="first">M.</forename>
<surname>Lester</surname>
</persName>
<idno type="halauthorid">189127</idno>
<affiliation ref="#struct-71490"></affiliation>
</author>
<author role="aut"> <persName> <forename type="first">T. K.</forename>
<surname>Yeoman</surname>
</persName>
<idno type="halauthorid">345170</idno>
<affiliation ref="#struct-71490"></affiliation>
</author>
<author role="aut"> <persName> <forename type="first">S. E.</forename>
<surname>Milan</surname>
</persName>
<idno type="halauthorid">345166</idno>
<affiliation ref="#struct-71490"></affiliation>
</author>
<author role="aut"> <persName> <forename type="first">H.</forename>
<surname>Ye</surname>
</persName>
<idno type="halauthorid">269073</idno>
<affiliation ref="#struct-71961"></affiliation>
</author>
<author role="aut"> <persName> <forename type="first">J. C.</forename>
<surname>Devlin</surname>
</persName>
<idno type="halauthorid">346454</idno>
<affiliation ref="#struct-71961"></affiliation>
</author>
<author role="aut"> <persName> <forename type="first">H. U.</forename>
<surname>Frey</surname>
</persName>
<idno type="halauthorid">64596</idno>
<affiliation ref="#struct-79127"></affiliation>
</author>
<author role="aut"> <persName> <forename type="first">T.</forename>
<surname>Kikuchi</surname>
</persName>
<idno type="halauthorid">34125</idno>
<affiliation ref="#struct-71251"></affiliation>
</author>
</analytic>
<monogr> <idno type="halJournalId" status="VALID">10459</idno>
<idno type="issn">0992-7689</idno>
<idno type="eissn">1432-0576</idno>
<title level="j">Annales Geophysicae</title>
<imprint> <publisher>European Geosciences Union</publisher>
<biblScope unit="volume">23</biblScope>
<biblScope unit="issue">4</biblScope>
<biblScope unit="pp">1371-1390</biblScope>
<date type="datePub">2005-06-03</date>
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<profileDesc> <langUsage> <language ident="en">English</language>
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<textClass> <classCode scheme="halDomain" n="sdu.ocean">Sciences of the Universe [physics]/Ocean, Atmosphere</classCode>
<classCode scheme="halDomain" n="sdu.stu">Sciences of the Universe [physics]/Earth Sciences</classCode>
<classCode scheme="halTypology" n="ART">Journal articles</classCode>
</textClass>
<abstract xml:lang="en">Earthward injections of energetic ions and electrons mark the onset of magnetospheric substorms. In the inner magnetosphere (L4), the energetic ions drift westward and the electrons eastward, thereby enhancing the equatorial ring current. Wave-particle interactions can accelerate these particles to radiation belt energies. The ions are injected slightly closer to Earth in the pre-midnight sector, leading to the formation of a radial polarisation field in the inner magnetosphere. This maps to a poleward electric field just equatorward of the auroral oval in the ionosphere. The poleward electric field is subsequently amplified by ionospheric feedback, thereby producing auroral westward flow channels (AWFCs). In terms of electric field strength, AWFCs are the strongest manifestation of substorms in the ionosphere. Because geomagnetic flux tubes are essentially equi-potentials, similar AWFC signatures should be observed simultaneously in the Northern and Southern Hemispheres. Here we present magnetically conjugate SuperDARN radar observations of AWFC activity observed in the pre-midnight sector during two substorm intervals including multiple onsets during the evening of 30 November 2002. The Northern Hemisphere observations were made with the Japanese radar located at King Salmon, Alaska (57, and the Southern Hemisphere observations with the Tasman International Geospace Environment Radar (TIGER) located at Bruny Island, Tasmania (55. LANL geosynchronous satellite observations of energetic ion and electron fluxes monitored the effects of substorms in the inner magnetosphere (L6). The radar-observed AWFC activity was coincident with activity observed at geosynchronous orbit, as well as westward current surges in the ionosphere observed using ground-based magnetometers. The location of AWFCs with respect to the auroral oval was inferred from FUV auroral images recorded on board the IMAGE spacecraft. DMSP SSIES ion drift measurements confirmed the presence of AWFCs equatorward of the auroral oval. Systematic asymmetries in the interhemispheric signatures of the AWFCs probably arose because the magnetic flux tubes were distorted at L shells passing close to the substorm dipolarisation region. Transient asymmetries were attributed to the development of nearby field-aligned potential drops and currents.</abstract>
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