First simultaneous observations of flux transfer events at the high-latitude magnetopause by the Cluster spacecraft and pulsed radar signatures in the conjugate ionosphere by the CUTLASS and EISCAT radars

Cluster magnetic field data are studied during an outbound pass through the post-noon high-latitude magnetopause region on 14 February 2001. The onset of several minute perturbations in the magnetospheric field was observed in conjunction with a southward turn of the interplanetary magnetic field ob...

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Published in:Annales Geophysicae
Main Authors: J. A. Wild, S. W. H. Cowley, J. A. Davies, H. Khan, M. Lester, S. E. Milan, G. Provan, T. K. Yeoman, A. Balogh, M. W. Dunlop, K.-H. Fornaçon, E. Georgescu
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2001
Subjects:
Q
Online Access:https://doi.org/10.5194/angeo-19-1491-2001
https://doaj.org/article/f3538bce697f4ade9b44967463d7bac1
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spelling ftdoajarticles:oai:doaj.org/article:f3538bce697f4ade9b44967463d7bac1 2023-05-15T16:04:41+02:00 First simultaneous observations of flux transfer events at the high-latitude magnetopause by the Cluster spacecraft and pulsed radar signatures in the conjugate ionosphere by the CUTLASS and EISCAT radars J. A. Wild S. W. H. Cowley J. A. Davies H. Khan M. Lester S. E. Milan G. Provan T. K. Yeoman A. Balogh M. W. Dunlop K.-H. Fornaçon E. Georgescu 2001-09-01T00:00:00Z https://doi.org/10.5194/angeo-19-1491-2001 https://doaj.org/article/f3538bce697f4ade9b44967463d7bac1 EN eng Copernicus Publications https://www.ann-geophys.net/19/1491/2001/angeo-19-1491-2001.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-19-1491-2001 0992-7689 1432-0576 https://doaj.org/article/f3538bce697f4ade9b44967463d7bac1 Annales Geophysicae, Vol 19, Pp 1491-1508 (2001) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2001 ftdoajarticles https://doi.org/10.5194/angeo-19-1491-2001 2022-12-31T13:35:15Z Cluster magnetic field data are studied during an outbound pass through the post-noon high-latitude magnetopause region on 14 February 2001. The onset of several minute perturbations in the magnetospheric field was observed in conjunction with a southward turn of the interplanetary magnetic field observed upstream by the ACE spacecraft and lagged to the subsolar magnetopause. These perturbations culminated in the observation of four clear magnetospheric flux transfer events (FTEs) adjacent to the magnetopause, together with a highly-structured magnetopause boundary layer containing related field features. Furthermore, clear FTEs were observed later in the magnetosheath. The magnetospheric FTEs were of essentially the same form as the original "flux erosion events" observed in HEOS-2 data at a similar location and under similar interplanetary conditions by Haerendel et al. (1978). We show that the nature of the magnetic perturbations in these events is consistent with the formation of open flux tubes connected to the northern polar ionosphere via pulsed reconnection in the dusk sector magnetopause. The magnetic footprint of the Cluster spacecraft during the boundary passage is shown to map centrally within the fields-of-view of the CUTLASS SuperDARN radars, and to pass across the field-aligned beam of the EISCAT Svalbard radar (ESR) system. It is shown that both the ionospheric flow and the backscatter power in the CUTLASS data pulse are in synchrony with the magnetospheric FTEs and boundary layer structures at the latitude of the Cluster footprint. These flow and power features are subsequently found to propagate poleward, forming classic "pulsed ionospheric flow" and "poleward-moving radar auroral form" structures at higher latitudes. The combined Cluster-CUTLASS observations thus represent a direct demonstration of the coupling of momentum and energy into the magnetosphere-ionosphere system via pulsed magnetopause reconnection. The ESR observations also reveal the nature of the structured and variable polar ... Article in Journal/Newspaper EISCAT Svalbard Directory of Open Access Journals: DOAJ Articles Svalbard Annales Geophysicae 19 10/12 1491 1508
institution Open Polar
collection Directory of Open Access Journals: DOAJ Articles
op_collection_id ftdoajarticles
language English
topic Science
Q
Physics
QC1-999
Geophysics. Cosmic physics
QC801-809
spellingShingle Science
Q
Physics
QC1-999
Geophysics. Cosmic physics
QC801-809
J. A. Wild
S. W. H. Cowley
J. A. Davies
H. Khan
M. Lester
S. E. Milan
G. Provan
T. K. Yeoman
A. Balogh
M. W. Dunlop
K.-H. Fornaçon
E. Georgescu
First simultaneous observations of flux transfer events at the high-latitude magnetopause by the Cluster spacecraft and pulsed radar signatures in the conjugate ionosphere by the CUTLASS and EISCAT radars
topic_facet Science
Q
Physics
QC1-999
Geophysics. Cosmic physics
QC801-809
description Cluster magnetic field data are studied during an outbound pass through the post-noon high-latitude magnetopause region on 14 February 2001. The onset of several minute perturbations in the magnetospheric field was observed in conjunction with a southward turn of the interplanetary magnetic field observed upstream by the ACE spacecraft and lagged to the subsolar magnetopause. These perturbations culminated in the observation of four clear magnetospheric flux transfer events (FTEs) adjacent to the magnetopause, together with a highly-structured magnetopause boundary layer containing related field features. Furthermore, clear FTEs were observed later in the magnetosheath. The magnetospheric FTEs were of essentially the same form as the original "flux erosion events" observed in HEOS-2 data at a similar location and under similar interplanetary conditions by Haerendel et al. (1978). We show that the nature of the magnetic perturbations in these events is consistent with the formation of open flux tubes connected to the northern polar ionosphere via pulsed reconnection in the dusk sector magnetopause. The magnetic footprint of the Cluster spacecraft during the boundary passage is shown to map centrally within the fields-of-view of the CUTLASS SuperDARN radars, and to pass across the field-aligned beam of the EISCAT Svalbard radar (ESR) system. It is shown that both the ionospheric flow and the backscatter power in the CUTLASS data pulse are in synchrony with the magnetospheric FTEs and boundary layer structures at the latitude of the Cluster footprint. These flow and power features are subsequently found to propagate poleward, forming classic "pulsed ionospheric flow" and "poleward-moving radar auroral form" structures at higher latitudes. The combined Cluster-CUTLASS observations thus represent a direct demonstration of the coupling of momentum and energy into the magnetosphere-ionosphere system via pulsed magnetopause reconnection. The ESR observations also reveal the nature of the structured and variable polar ...
format Article in Journal/Newspaper
author J. A. Wild
S. W. H. Cowley
J. A. Davies
H. Khan
M. Lester
S. E. Milan
G. Provan
T. K. Yeoman
A. Balogh
M. W. Dunlop
K.-H. Fornaçon
E. Georgescu
author_facet J. A. Wild
S. W. H. Cowley
J. A. Davies
H. Khan
M. Lester
S. E. Milan
G. Provan
T. K. Yeoman
A. Balogh
M. W. Dunlop
K.-H. Fornaçon
E. Georgescu
author_sort J. A. Wild
title First simultaneous observations of flux transfer events at the high-latitude magnetopause by the Cluster spacecraft and pulsed radar signatures in the conjugate ionosphere by the CUTLASS and EISCAT radars
title_short First simultaneous observations of flux transfer events at the high-latitude magnetopause by the Cluster spacecraft and pulsed radar signatures in the conjugate ionosphere by the CUTLASS and EISCAT radars
title_full First simultaneous observations of flux transfer events at the high-latitude magnetopause by the Cluster spacecraft and pulsed radar signatures in the conjugate ionosphere by the CUTLASS and EISCAT radars
title_fullStr First simultaneous observations of flux transfer events at the high-latitude magnetopause by the Cluster spacecraft and pulsed radar signatures in the conjugate ionosphere by the CUTLASS and EISCAT radars
title_full_unstemmed First simultaneous observations of flux transfer events at the high-latitude magnetopause by the Cluster spacecraft and pulsed radar signatures in the conjugate ionosphere by the CUTLASS and EISCAT radars
title_sort first simultaneous observations of flux transfer events at the high-latitude magnetopause by the cluster spacecraft and pulsed radar signatures in the conjugate ionosphere by the cutlass and eiscat radars
publisher Copernicus Publications
publishDate 2001
url https://doi.org/10.5194/angeo-19-1491-2001
https://doaj.org/article/f3538bce697f4ade9b44967463d7bac1
geographic Svalbard
geographic_facet Svalbard
genre EISCAT
Svalbard
genre_facet EISCAT
Svalbard
op_source Annales Geophysicae, Vol 19, Pp 1491-1508 (2001)
op_relation https://www.ann-geophys.net/19/1491/2001/angeo-19-1491-2001.pdf
https://doaj.org/toc/0992-7689
https://doaj.org/toc/1432-0576
doi:10.5194/angeo-19-1491-2001
0992-7689
1432-0576
https://doaj.org/article/f3538bce697f4ade9b44967463d7bac1
op_doi https://doi.org/10.5194/angeo-19-1491-2001
container_title Annales Geophysicae
container_volume 19
container_issue 10/12
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