Capture of magnetosheath plasma by the magnetosphere during northward IMF
We interpret combined auroral and simultaneous particle data from an overflight of the ground station at Svalbard by the F13 DMSP spacecraft in terms of pulsed “capture” of northward-directed magnetosheath flux tubes by the magnetosphere, due to sequential lobe reconnection in both the southern and...
Published in: | Geophysical Research Letters |
---|---|
Main Authors: | , , , , , , |
Format: | Text |
Language: | unknown |
Published: |
University of New Hampshire Scholars' Repository
1999
|
Subjects: | |
Online Access: | https://scholars.unh.edu/cmerg/292 https://doi.org/10.1029/1999GL900600 |
id |
ftuninhampshire:oai:scholars.unh.edu:cmerg-1291 |
---|---|
record_format |
openpolar |
spelling |
ftuninhampshire:oai:scholars.unh.edu:cmerg-1291 2023-05-15T18:29:49+02:00 Capture of magnetosheath plasma by the magnetosphere during northward IMF Sandholt, P. E. Farrugia, Charlie J. Cowley, S. W. H. Denig, W. F. Lester, M. Moen, J. Lybekk, B. 1999-09-15T07:00:00Z https://scholars.unh.edu/cmerg/292 https://doi.org/10.1029/1999GL900600 unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/cmerg/292 https://doi.org/10.1029/1999GL900600 Coronal Mass Ejection Research Group text 1999 ftuninhampshire https://doi.org/10.1029/1999GL900600 2023-01-30T22:05:23Z We interpret combined auroral and simultaneous particle data from an overflight of the ground station at Svalbard by the F13 DMSP spacecraft in terms of pulsed “capture” of northward-directed magnetosheath flux tubes by the magnetosphere, due to sequential lobe reconnection in both the southern and northern hemispheres. The event refers to a ∼40-min long interval characterized by strongly northward interplanetary magnetic field (IMF) (Bz=7 nT; clock angle ∼ 10°-15°). The meridan scanning photometer at the ground station records a long stepwise poleward retraction of the band of auroral emission in the cusp region. Each step is marked by an initial, brief poleward leap, followed by a ∼5 min period of relatively steady auroral latitude. In the one event where simultaneous particle data are available (at 1100 MLT), the spacecraft traverses a region of auroral precipitation where electrons and ions of magnetosheath origin are present, together with equatorward convection. With a large sunward IMF tilt (Bx=6-7 nT) in the winter hemisphere, we suppose that the process starts with reconnection poleward of the southern cusp followed by overdraped lobe flux which reconnects with magnetospheric field lines in the northern hemisphere. Text Svalbard University of New Hampshire: Scholars Repository Svalbard Geophysical Research Letters 26 18 2833 2836 |
institution |
Open Polar |
collection |
University of New Hampshire: Scholars Repository |
op_collection_id |
ftuninhampshire |
language |
unknown |
description |
We interpret combined auroral and simultaneous particle data from an overflight of the ground station at Svalbard by the F13 DMSP spacecraft in terms of pulsed “capture” of northward-directed magnetosheath flux tubes by the magnetosphere, due to sequential lobe reconnection in both the southern and northern hemispheres. The event refers to a ∼40-min long interval characterized by strongly northward interplanetary magnetic field (IMF) (Bz=7 nT; clock angle ∼ 10°-15°). The meridan scanning photometer at the ground station records a long stepwise poleward retraction of the band of auroral emission in the cusp region. Each step is marked by an initial, brief poleward leap, followed by a ∼5 min period of relatively steady auroral latitude. In the one event where simultaneous particle data are available (at 1100 MLT), the spacecraft traverses a region of auroral precipitation where electrons and ions of magnetosheath origin are present, together with equatorward convection. With a large sunward IMF tilt (Bx=6-7 nT) in the winter hemisphere, we suppose that the process starts with reconnection poleward of the southern cusp followed by overdraped lobe flux which reconnects with magnetospheric field lines in the northern hemisphere. |
format |
Text |
author |
Sandholt, P. E. Farrugia, Charlie J. Cowley, S. W. H. Denig, W. F. Lester, M. Moen, J. Lybekk, B. |
spellingShingle |
Sandholt, P. E. Farrugia, Charlie J. Cowley, S. W. H. Denig, W. F. Lester, M. Moen, J. Lybekk, B. Capture of magnetosheath plasma by the magnetosphere during northward IMF |
author_facet |
Sandholt, P. E. Farrugia, Charlie J. Cowley, S. W. H. Denig, W. F. Lester, M. Moen, J. Lybekk, B. |
author_sort |
Sandholt, P. E. |
title |
Capture of magnetosheath plasma by the magnetosphere during northward IMF |
title_short |
Capture of magnetosheath plasma by the magnetosphere during northward IMF |
title_full |
Capture of magnetosheath plasma by the magnetosphere during northward IMF |
title_fullStr |
Capture of magnetosheath plasma by the magnetosphere during northward IMF |
title_full_unstemmed |
Capture of magnetosheath plasma by the magnetosphere during northward IMF |
title_sort |
capture of magnetosheath plasma by the magnetosphere during northward imf |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
1999 |
url |
https://scholars.unh.edu/cmerg/292 https://doi.org/10.1029/1999GL900600 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Svalbard |
genre_facet |
Svalbard |
op_source |
Coronal Mass Ejection Research Group |
op_relation |
https://scholars.unh.edu/cmerg/292 https://doi.org/10.1029/1999GL900600 |
op_doi |
https://doi.org/10.1029/1999GL900600 |
container_title |
Geophysical Research Letters |
container_volume |
26 |
container_issue |
18 |
container_start_page |
2833 |
op_container_end_page |
2836 |
_version_ |
1766213209604227072 |