eprintid: 162631
rev_number: 44
eprint_status: archive
userid: 608
dir: disk0/00/16/26/31
datestamp: 2010-11-01 13:00:38
lastmod: 2021-10-10 22:43:11
status_changed: 2012-07-25 14:08:33
type: article
metadata_visibility: show
item_issues_count: 0
creators_name: Escoubet, CP
creators_name: Bosqued, JM
creators_name: Berchem, J
creators_name: Trattner, KJ
creators_name: Taylor, MGGT
creators_name: Pitout, F
creators_name: Laakso, H
creators_name: Masson, A
creators_name: Dunlop, M
creators_name: Reme, H
creators_name: Dandouras, I
creators_name: Fazakerley, A
title: Temporal evolution of a staircase ion signature observed by Cluster in the mid-altitude polar cusp
ispublished: pub
divisions: UCL
divisions: B04
divisions: C06
divisions: F63
keywords: Flux-transfer events, Interplanetary magnetic-field, Low-altitude observations, Magnetopause reconnection, Precipitation, Aurora, Edge
note: Copyright 2006 by the American Geophysical Union
abstract: We use the Cluster string of pearls configuration to investigate temporal variations of ion precipitation in the mid-altitude polar cusp. On 7 Aug. 2004, Cluster 4 was moving poleward through the Northern cusp, followed by Cluster 1, Cluster 2, and finally Cluster 3. The Wind spacecraft detected a Southward turning of the Interplanetary Magnetic Field ( IMF) at the beginning of the cusp crossings and IMF-Bz stayed negative throughout. Cluster 4 observed a high energy step in the ion dispersion around 1 keV on the equatorward side of the cusp. C1, entering the cusp around 1 minute later, did not observe the high energy step anymore but a partial dispersion with a low energy cut-off reaching 100 eV. About 9 min later, C3 entered the cusp and observed a full ion dispersion from a few keV down to around 50 eV. The open-closed boundary, identified by electron precipitation, was initially moving equatorward at a rate of -0.43 degrees ILAT/minute at the beginning of the event and then slowed down to -0.16 degrees ILAT/minute, suggesting the erosion of the dayside magnetosphere under IMF Southward. This event is explained by the onset of dayside reconnection when the IMF turned southward; the step being the first signature of the reconnection that would then evolve as a full dispersion as reconnection goes on. We observed 1-3 keV ions near the open-closed boundary on the three spacecraft crossings that suggests a continuous reconnection during about 9 minutes.
date: 2006-04-12
publisher: Amer Geophysical Union
official_url: http://dx.doi.org/10.1029/2005GL025598
vfaculties: VMPS
oa_status: green
language: eng
primo: open
primo_central: open_green
article_type_text: Article
verified: verified_manual
elements_source: Manually entered
elements_id: 124090
doi: 10.1029/2005GL025598
lyricists_name: Fazakerley, Andrew
lyricists_id: ANFAZ75
full_text_status: public
publication: Geophysical Research Letters
volume: 33
number: 7
article_number: L07108
issn: 0094-8276
citation:        Escoubet, CP;    Bosqued, JM;    Berchem, J;    Trattner, KJ;    Taylor, MGGT;    Pitout, F;    Laakso, H;                     ... Fazakerley, A; + view all <#>        Escoubet, CP;  Bosqued, JM;  Berchem, J;  Trattner, KJ;  Taylor, MGGT;  Pitout, F;  Laakso, H;  Masson, A;  Dunlop, M;  Reme, H;  Dandouras, I;  Fazakerley, A;   - view fewer <#>    (2006)    Temporal evolution of a staircase ion signature observed by Cluster in the mid-altitude polar cusp.                   Geophysical Research Letters , 33  (7)    , Article L07108.  10.1029/2005GL025598 <https://doi.org/10.1029/2005GL025598>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/162631/1/2005GL025598.pdf