Boundary layer plasma flows from high‐latitude reconnection in the summer hemisphere for northward IMF: THEMIS multi‐point observations
Identifieur interne : 007F17 ( Main/Exploration ); précédent : 007F16; suivant : 007F18Boundary layer plasma flows from high‐latitude reconnection in the summer hemisphere for northward IMF: THEMIS multi‐point observations
Auteurs : H. Hasegawa [Japon] ; J. P. Mcfadden [États-Unis] ; O. D. Constantinescu [Allemagne] ; Y. V. Bogdanova [Australie] ; J. Wang [République populaire de Chine] ; M. W. Dunlop [Royaume-Uni] ; V. Angelopoulos [États-Unis] ; H. U. Frey [États-Unis] ; T. Takada [Japon] ; B. Lavraud [France] ; Q. Zhang [Royaume-Uni] ; Z. Y. Pu [République populaire de Chine] ; A. N. Fazakerley [Royaume-Uni] ; E. V. Panov [Autriche] ; M. Volwerk [Autriche] ; C. Shen [République populaire de Chine] ; J. K. Shi [République populaire de Chine]Source :
- Geophysical Research Letters [ 0094-8276 ] ; 2009-08-16.
Descripteurs français
- Wicri :
- topic : Simulation.
English descriptors
- KwdEn :
- Cdpl, Clock angle, Dayside, Dayside llbl, Dayside magnetopause, Dipole tilt, Field lines, Geophys, Global simulation, Hasegawa, Ieroset, Inner llbl, Lavraud, Llbl, Magnetopause, Magnetosheath, Magnetosheath electrons, Magnetosheath ions, Northern cusp, Northern reconnection, Outer llbl, Phan, Plasma transport, Reconnection, Simulation, Solar wind, Space sciences, Summer hemisphere, Themis, Themis observations, Themis spacecraft.
- Teeft :
- Cdpl, Clock angle, Dayside, Dayside llbl, Dayside magnetopause, Dipole tilt, Field lines, Geophys, Global simulation, Hasegawa, Ieroset, Inner llbl, Lavraud, Llbl, Magnetopause, Magnetosheath, Magnetosheath electrons, Magnetosheath ions, Northern cusp, Northern reconnection, Outer llbl, Phan, Plasma transport, Reconnection, Simulation, Solar wind, Space sciences, Summer hemisphere, Themis, Themis observations, Themis spacecraft.
Abstract
On 2008‐07‐11, the THEMIS spacecraft, separated both longitudinally and radially, traversed the dayside low‐latitude boundary layer (LLBL) under extended northward IMF. They detected southward flows of magnetosheath plasma from magnetopause reconnection poleward of the northern cusp, which were cold‐dense, and had southward velocity ∼100 km/s and longitudinal extent >3 RE. These features all agree with a global MHD simulation of the magnetosphere for similar conditions, in which under large geomagnetic dipole tilt, an LLBL forms via poleward‐of‐the‐cusp reconnection first in the summer hemisphere and later in the other. Contrary to the simulation, however, the observed LLBL was mostly magnetically closed, characterized by balanced field‐aligned and anti‐field‐aligned electron fluxes, and was less thick (≤0.5 RE). The former suggests comparable reconnection rate in both hemispheres, while the latter suggests the actual reconnection rate being lower, and/or the plasma transport toward the magnetotail being faster, than in the simulation.
Url:
DOI: 10.1029/2009GL039410
Affiliations:
- Allemagne, Australie, Autriche, France, Japon, Royaume-Uni, République populaire de Chine, États-Unis
- Angleterre, Californie, Grand Londres, Midi-Pyrénées, Occitanie (région administrative)
- Berkeley (Californie), Londres, Los Angeles, Pékin, Toulouse
- University College de Londres, Université de Pékin
Links toward previous steps (curation, corpus...)
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- to stream Istex, to step Curation: 000A14
- to stream Istex, to step Checkpoint: 000F54
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Le document en format XML
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Hasegawa</name><affiliation wicri:level="1"><country wicri:rule="url">Japon</country></affiliation><affiliation wicri:level="1"><country xml:lang="fr">Japon</country><wicri:regionArea>Institute of Space and Astronautical Science, JAXA, Sagamihara</wicri:regionArea><wicri:noRegion>Sagamihara</wicri:noRegion></affiliation><affiliation wicri:level="1"><country wicri:rule="url">Japon</country></affiliation></author><author><name sortKey="Mcfadden, J P" sort="Mcfadden, J P" uniqKey="Mcfadden J" first="J. P." last="Mcfadden">J. P. Mcfadden</name><affiliation wicri:level="3"><country xml:lang="fr">États-Unis</country><wicri:regionArea>SSL, University of California, California, Berkeley</wicri:regionArea><placeName><settlement type="city">Berkeley (Californie)</settlement><region type="state">Californie</region></placeName></affiliation></author><author><name sortKey="Constantinescu, O D" sort="Constantinescu, O D" uniqKey="Constantinescu O" first="O. D." last="Constantinescu">O. D. 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Zhang</name><affiliation wicri:level="1"><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>Department of Space Sciences, Rutherford Appleton Laboratory, Didcot</wicri:regionArea><wicri:noRegion>Didcot</wicri:noRegion></affiliation></author><author><name sortKey="Pu, Z Y" sort="Pu, Z Y" uniqKey="Pu Z" first="Z. Y." last="Pu">Z. Y. Pu</name><affiliation wicri:level="4"><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>Institute of Space Physics and Applied Technology, School of Earth and Space Sciences, Peking University, Beijing</wicri:regionArea><placeName><settlement type="city">Pékin</settlement><settlement type="city">Pékin</settlement></placeName><orgName type="university">Université de Pékin</orgName></affiliation></author><author><name sortKey="Fazakerley, A N" sort="Fazakerley, A N" uniqKey="Fazakerley A" first="A. N." last="Fazakerley">A. N. 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Volwerk</name><affiliation wicri:level="1"><country xml:lang="fr">Autriche</country><wicri:regionArea>Space Research Institute, Austrian Academy of Sciences, Graz</wicri:regionArea><wicri:noRegion>Graz</wicri:noRegion></affiliation></author><author><name sortKey="Shen, C" sort="Shen, C" uniqKey="Shen C" first="C." last="Shen">C. Shen</name><affiliation wicri:level="3"><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>CSSAR, Chinese Academy of Sciences, Beijing</wicri:regionArea><placeName><settlement type="city">Pékin</settlement></placeName></affiliation></author><author><name sortKey="Shi, J K" sort="Shi, J K" uniqKey="Shi J" first="J. K." last="Shi">J. K. Shi</name><affiliation wicri:level="3"><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>CSSAR, Chinese Academy of Sciences, Beijing</wicri:regionArea><placeName><settlement type="city">Pékin</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Geophysical Research Letters</title><title level="j" type="alt">GEOPHYSICAL RESEARCH LETTERS</title><idno type="ISSN">0094-8276</idno><idno type="eISSN">1944-8007</idno><imprint><biblScope unit="vol">36</biblScope><biblScope unit="issue">15</biblScope><biblScope unit="page-count">5</biblScope><date type="published" when="2009-08-16">2009-08-16</date></imprint><idno type="ISSN">0094-8276</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0094-8276</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cdpl</term><term>Clock angle</term><term>Dayside</term><term>Dayside llbl</term><term>Dayside magnetopause</term><term>Dipole tilt</term><term>Field lines</term><term>Geophys</term><term>Global simulation</term><term>Hasegawa</term><term>Ieroset</term><term>Inner llbl</term><term>Lavraud</term><term>Llbl</term><term>Magnetopause</term><term>Magnetosheath</term><term>Magnetosheath electrons</term><term>Magnetosheath ions</term><term>Northern cusp</term><term>Northern reconnection</term><term>Outer llbl</term><term>Phan</term><term>Plasma transport</term><term>Reconnection</term><term>Simulation</term><term>Solar wind</term><term>Space sciences</term><term>Summer hemisphere</term><term>Themis</term><term>Themis observations</term><term>Themis spacecraft</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Cdpl</term><term>Clock angle</term><term>Dayside</term><term>Dayside llbl</term><term>Dayside magnetopause</term><term>Dipole tilt</term><term>Field lines</term><term>Geophys</term><term>Global simulation</term><term>Hasegawa</term><term>Ieroset</term><term>Inner llbl</term><term>Lavraud</term><term>Llbl</term><term>Magnetopause</term><term>Magnetosheath</term><term>Magnetosheath electrons</term><term>Magnetosheath ions</term><term>Northern cusp</term><term>Northern reconnection</term><term>Outer llbl</term><term>Phan</term><term>Plasma transport</term><term>Reconnection</term><term>Simulation</term><term>Solar wind</term><term>Space sciences</term><term>Summer hemisphere</term><term>Themis</term><term>Themis observations</term><term>Themis spacecraft</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Simulation</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract">On 2008‐07‐11, the THEMIS spacecraft, separated both longitudinally and radially, traversed the dayside low‐latitude boundary layer (LLBL) under extended northward IMF. They detected southward flows of magnetosheath plasma from magnetopause reconnection poleward of the northern cusp, which were cold‐dense, and had southward velocity ∼100 km/s and longitudinal extent >3 RE. These features all agree with a global MHD simulation of the magnetosphere for similar conditions, in which under large geomagnetic dipole tilt, an LLBL forms via poleward‐of‐the‐cusp reconnection first in the summer hemisphere and later in the other. Contrary to the simulation, however, the observed LLBL was mostly magnetically closed, characterized by balanced field‐aligned and anti‐field‐aligned electron fluxes, and was less thick (≤0.5 RE). The former suggests comparable reconnection rate in both hemispheres, while the latter suggests the actual reconnection rate being lower, and/or the plasma transport toward the magnetotail being faster, than in the simulation.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>Australie</li><li>Autriche</li><li>France</li><li>Japon</li><li>Royaume-Uni</li><li>République populaire de Chine</li><li>États-Unis</li></country><region><li>Angleterre</li><li>Californie</li><li>Grand Londres</li><li>Midi-Pyrénées</li><li>Occitanie (région administrative)</li></region><settlement><li>Berkeley (Californie)</li><li>Londres</li><li>Los Angeles</li><li>Pékin</li><li>Toulouse</li></settlement><orgName><li>University College de Londres</li><li>Université de Pékin</li></orgName></list><tree><country name="Japon"><noRegion><name sortKey="Hasegawa, H" sort="Hasegawa, H" uniqKey="Hasegawa H" first="H." last="Hasegawa">H. 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