Connection between high-latitude arcs and the low-latitude boundary layer during periods of northward IMF
International audience High-latitude auroral arcs are a typical feature of periods of northward IMF. They consist in thin and elongated optical emission similar to discrete auroral arcs but located in the polar ionosphere. Their formation mechanism and the magnetospheric regions to which they are co...
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ftuniparissaclay:oai:HAL:hal-02861683v1 2024-09-15T18:32:20+00:00 Connection between high-latitude arcs and the low-latitude boundary layer during periods of northward IMF Maggiolo, R. Fontaine, Dominique Hosokawa, K. Maes, Lukas Zhang, Y. Fear, R. C. Cumnock, J. A. Kozlovsky, A. Kullen, A. Milan, S. E. Shiokawa, K. Echim, M. Laboratoire de Physique des Plasmas (LPP) Université Paris-Sud - Paris 11 (UP11)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École polytechnique (X) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Sorbonne Université (SU)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) San Francisco, California, United States 2014-12-15 https://hal.science/hal-02861683 en eng HAL CCSD hal-02861683 https://hal.science/hal-02861683 American Geophysical Union, Fall Meeting https://hal.science/hal-02861683 American Geophysical Union, Fall Meeting, Dec 2014, San Francisco, California, United States. 13, pp.SM13F-4229, 2014 [PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] info:eu-repo/semantics/conferenceObject Conference poster 2014 ftuniparissaclay 2024-08-01T23:49:22Z International audience High-latitude auroral arcs are a typical feature of periods of northward IMF. They consist in thin and elongated optical emission similar to discrete auroral arcs but located in the polar ionosphere. Their formation mechanism and the magnetospheric regions to which they are connected are still not well understood. On November 10, 2005, high-latitude arcs were detected by an all-sky camera at Resolute Bay in Canada and by the TIMED/GUVI and DMSP/SUSIE space-based imagers. These observations indicate that they were detaching from the duskside auroral oval and then drifting poleward while pointing in the cusp direction. The same day, the Cluster spacecraft were flying in the dawn-dusk direction from the lobe region at altitudes ~5 RE to the magnetospheric equatorial plane at geocentric distances ~19 RE. Cluster observations reveal the presence of field-aligned acceleration regions above the polar ionosphere associated with the high-latitude arcs detected by the imagers. We analyze Cluster particle observations from the lobe region to the duskside magnetopause. In the high-latitude arcs region, Cluster detects upgoing ions and precipitating electrons accelerated by a quasi-static electric field. These accelerated particles coexist with plasmasheet-like plasma embedded in the lobe region. A comparison between the 4 Cluster spacecraft electron measurements for the most poleward arc reveals that the plasmasheet-like electron population is vanishing on a time scale of a few minutes while the plasmasheet-like ion population doesn't display any temporal evolution. The most equatorward arc is separated from the auroral oval by a "transition" region where weak fluxes of ions with plasmasheet like temperatures are detected. Then the Cluster spacecraft cross the plasmasheet until they reach the low-latitude boundary layer (LLBL) characterized by a mixture of plasmasheet and magnetosheath plasma. The "transition" region and the LLBL are magnetically connected. Using Cluster observations we show that ... Conference Object Resolute Bay Archives ouvertes de Paris-Saclay |
institution |
Open Polar |
collection |
Archives ouvertes de Paris-Saclay |
op_collection_id |
ftuniparissaclay |
language |
English |
topic |
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
spellingShingle |
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Maggiolo, R. Fontaine, Dominique Hosokawa, K. Maes, Lukas Zhang, Y. Fear, R. C. Cumnock, J. A. Kozlovsky, A. Kullen, A. Milan, S. E. Shiokawa, K. Echim, M. Connection between high-latitude arcs and the low-latitude boundary layer during periods of northward IMF |
topic_facet |
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
description |
International audience High-latitude auroral arcs are a typical feature of periods of northward IMF. They consist in thin and elongated optical emission similar to discrete auroral arcs but located in the polar ionosphere. Their formation mechanism and the magnetospheric regions to which they are connected are still not well understood. On November 10, 2005, high-latitude arcs were detected by an all-sky camera at Resolute Bay in Canada and by the TIMED/GUVI and DMSP/SUSIE space-based imagers. These observations indicate that they were detaching from the duskside auroral oval and then drifting poleward while pointing in the cusp direction. The same day, the Cluster spacecraft were flying in the dawn-dusk direction from the lobe region at altitudes ~5 RE to the magnetospheric equatorial plane at geocentric distances ~19 RE. Cluster observations reveal the presence of field-aligned acceleration regions above the polar ionosphere associated with the high-latitude arcs detected by the imagers. We analyze Cluster particle observations from the lobe region to the duskside magnetopause. In the high-latitude arcs region, Cluster detects upgoing ions and precipitating electrons accelerated by a quasi-static electric field. These accelerated particles coexist with plasmasheet-like plasma embedded in the lobe region. A comparison between the 4 Cluster spacecraft electron measurements for the most poleward arc reveals that the plasmasheet-like electron population is vanishing on a time scale of a few minutes while the plasmasheet-like ion population doesn't display any temporal evolution. The most equatorward arc is separated from the auroral oval by a "transition" region where weak fluxes of ions with plasmasheet like temperatures are detected. Then the Cluster spacecraft cross the plasmasheet until they reach the low-latitude boundary layer (LLBL) characterized by a mixture of plasmasheet and magnetosheath plasma. The "transition" region and the LLBL are magnetically connected. Using Cluster observations we show that ... |
author2 |
Laboratoire de Physique des Plasmas (LPP) Université Paris-Sud - Paris 11 (UP11)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École polytechnique (X) Institut Polytechnique de Paris (IP Paris)-Institut Polytechnique de Paris (IP Paris)-Sorbonne Université (SU)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
format |
Conference Object |
author |
Maggiolo, R. Fontaine, Dominique Hosokawa, K. Maes, Lukas Zhang, Y. Fear, R. C. Cumnock, J. A. Kozlovsky, A. Kullen, A. Milan, S. E. Shiokawa, K. Echim, M. |
author_facet |
Maggiolo, R. Fontaine, Dominique Hosokawa, K. Maes, Lukas Zhang, Y. Fear, R. C. Cumnock, J. A. Kozlovsky, A. Kullen, A. Milan, S. E. Shiokawa, K. Echim, M. |
author_sort |
Maggiolo, R. |
title |
Connection between high-latitude arcs and the low-latitude boundary layer during periods of northward IMF |
title_short |
Connection between high-latitude arcs and the low-latitude boundary layer during periods of northward IMF |
title_full |
Connection between high-latitude arcs and the low-latitude boundary layer during periods of northward IMF |
title_fullStr |
Connection between high-latitude arcs and the low-latitude boundary layer during periods of northward IMF |
title_full_unstemmed |
Connection between high-latitude arcs and the low-latitude boundary layer during periods of northward IMF |
title_sort |
connection between high-latitude arcs and the low-latitude boundary layer during periods of northward imf |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.science/hal-02861683 |
op_coverage |
San Francisco, California, United States |
genre |
Resolute Bay |
genre_facet |
Resolute Bay |
op_source |
American Geophysical Union, Fall Meeting https://hal.science/hal-02861683 American Geophysical Union, Fall Meeting, Dec 2014, San Francisco, California, United States. 13, pp.SM13F-4229, 2014 |
op_relation |
hal-02861683 https://hal.science/hal-02861683 |
_version_ |
1810474055413792768 |