Coordinated Cluster, ground-based instrumentation and low-altitude satellite observations of transient poleward-moving events in the ionosphere and in the tail lobe
During the interval between 8:00–9:30 on 14 January 2001, the four Cluster spacecraft were moving from the central magnetospheric lobe, through the dusk sector mantle, on their way towards intersecting the magnetopause near 15:00 MLT and 15:00 UT. Throughout this interval, the EISCAT Svalbard Radar...
Published in: | Annales Geophysicae |
---|---|
Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2001
|
Subjects: | |
Online Access: | https://doi.org/10.5194/angeo-19-1589-2001 https://doaj.org/article/06db559b9466449298ef4ba5467e7f15 |
id |
ftdoajarticles:oai:doaj.org/article:06db559b9466449298ef4ba5467e7f15 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:06db559b9466449298ef4ba5467e7f15 2023-05-15T16:04:40+02:00 Coordinated Cluster, ground-based instrumentation and low-altitude satellite observations of transient poleward-moving events in the ionosphere and in the tail lobe M. Lockwood H. Opgenoorth A. P. van Eyken A. Fazakerley J.-M. Bosqued W. Denig J. A. Wild C. Cully R. Greenwald G. Lu O. Amm H. Frey A. Strømme P. Prikryl M. A. Hapgood M. N. Wild R. Stamper M. Taylor I. McCrea K. Kauristie T. Pulkkinen F. Pitout A. Balogh M. Dunlop H. Rème R. Behlke T. Hansen G. Provan P. Eglitis S. K. Morley D. Alcaydé P.-L. Blelly J. Moen E. Donovan M. Engebretson M. Lester J. Watermann M. F. Marcucci 2001-09-01T00:00:00Z https://doi.org/10.5194/angeo-19-1589-2001 https://doaj.org/article/06db559b9466449298ef4ba5467e7f15 EN eng Copernicus Publications https://www.ann-geophys.net/19/1589/2001/angeo-19-1589-2001.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-19-1589-2001 0992-7689 1432-0576 https://doaj.org/article/06db559b9466449298ef4ba5467e7f15 Annales Geophysicae, Vol 19, Pp 1589-1612 (2001) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2001 ftdoajarticles https://doi.org/10.5194/angeo-19-1589-2001 2022-12-31T05:42:59Z During the interval between 8:00–9:30 on 14 January 2001, the four Cluster spacecraft were moving from the central magnetospheric lobe, through the dusk sector mantle, on their way towards intersecting the magnetopause near 15:00 MLT and 15:00 UT. Throughout this interval, the EISCAT Svalbard Radar (ESR) at Longyearbyen observed a series of poleward-moving transient events of enhanced F-region plasma concentration ("polar cap patches"), with a repetition period of the order of 10 min. Allowing for the estimated solar wind propagation delay of 75 ( ± 5) min, the interplanetary magnetic field (IMF) had a southward component during most of the interval. The magnetic footprint of the Cluster spacecraft, mapped to the ionosphere using the Tsyganenko T96 model (with input conditions prevailing during this event), was to the east of the ESR beams. Around 09:05 UT, the DMSP-F12 satellite flew over the ESR and showed a sawtooth cusp ion dispersion signature that also extended into the electrons on the equatorward edge of the cusp, revealing a pulsed magnetopause reconnection. The consequent enhanced ionospheric flow events were imaged by the SuperDARN HF backscatter radars. The average convection patterns (derived using the AMIE technique on data from the magnetometers, the EISCAT and SuperDARN radars, and the DMSP satellites) show that the associated poleward-moving events also convected over the predicted footprint of the Cluster spacecraft. Cluster observed enhancements in the fluxes of both electrons and ions. These events were found to be essentially identical at all four spacecraft, indicating that they had a much larger spatial scale than the satellite separation of the order of 600 km. Some of the events show a correspondence between the lowest energy magnetosheath electrons detected by the PEACE instrument on Cluster (10–20 eV) and the topside ionospheric enhancements seen by the ESR (at 400–700 km). We suggest that a potential barrier at the magnetopause, which prevents the lowest energy electrons from entering ... Article in Journal/Newspaper EISCAT Longyearbyen Svalbard Directory of Open Access Journals: DOAJ Articles Svalbard Longyearbyen Annales Geophysicae 19 10/12 1589 1612 |
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 M. Lockwood H. Opgenoorth A. P. van Eyken A. Fazakerley J.-M. Bosqued W. Denig J. A. Wild C. Cully R. Greenwald G. Lu O. Amm H. Frey A. Strømme P. Prikryl M. A. Hapgood M. N. Wild R. Stamper M. Taylor I. McCrea K. Kauristie T. Pulkkinen F. Pitout A. Balogh M. Dunlop H. Rème R. Behlke T. Hansen G. Provan P. Eglitis S. K. Morley D. Alcaydé P.-L. Blelly J. Moen E. Donovan M. Engebretson M. Lester J. Watermann M. F. Marcucci Coordinated Cluster, ground-based instrumentation and low-altitude satellite observations of transient poleward-moving events in the ionosphere and in the tail lobe |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
During the interval between 8:00–9:30 on 14 January 2001, the four Cluster spacecraft were moving from the central magnetospheric lobe, through the dusk sector mantle, on their way towards intersecting the magnetopause near 15:00 MLT and 15:00 UT. Throughout this interval, the EISCAT Svalbard Radar (ESR) at Longyearbyen observed a series of poleward-moving transient events of enhanced F-region plasma concentration ("polar cap patches"), with a repetition period of the order of 10 min. Allowing for the estimated solar wind propagation delay of 75 ( ± 5) min, the interplanetary magnetic field (IMF) had a southward component during most of the interval. The magnetic footprint of the Cluster spacecraft, mapped to the ionosphere using the Tsyganenko T96 model (with input conditions prevailing during this event), was to the east of the ESR beams. Around 09:05 UT, the DMSP-F12 satellite flew over the ESR and showed a sawtooth cusp ion dispersion signature that also extended into the electrons on the equatorward edge of the cusp, revealing a pulsed magnetopause reconnection. The consequent enhanced ionospheric flow events were imaged by the SuperDARN HF backscatter radars. The average convection patterns (derived using the AMIE technique on data from the magnetometers, the EISCAT and SuperDARN radars, and the DMSP satellites) show that the associated poleward-moving events also convected over the predicted footprint of the Cluster spacecraft. Cluster observed enhancements in the fluxes of both electrons and ions. These events were found to be essentially identical at all four spacecraft, indicating that they had a much larger spatial scale than the satellite separation of the order of 600 km. Some of the events show a correspondence between the lowest energy magnetosheath electrons detected by the PEACE instrument on Cluster (10–20 eV) and the topside ionospheric enhancements seen by the ESR (at 400–700 km). We suggest that a potential barrier at the magnetopause, which prevents the lowest energy electrons from entering ... |
format |
Article in Journal/Newspaper |
author |
M. Lockwood H. Opgenoorth A. P. van Eyken A. Fazakerley J.-M. Bosqued W. Denig J. A. Wild C. Cully R. Greenwald G. Lu O. Amm H. Frey A. Strømme P. Prikryl M. A. Hapgood M. N. Wild R. Stamper M. Taylor I. McCrea K. Kauristie T. Pulkkinen F. Pitout A. Balogh M. Dunlop H. Rème R. Behlke T. Hansen G. Provan P. Eglitis S. K. Morley D. Alcaydé P.-L. Blelly J. Moen E. Donovan M. Engebretson M. Lester J. Watermann M. F. Marcucci |
author_facet |
M. Lockwood H. Opgenoorth A. P. van Eyken A. Fazakerley J.-M. Bosqued W. Denig J. A. Wild C. Cully R. Greenwald G. Lu O. Amm H. Frey A. Strømme P. Prikryl M. A. Hapgood M. N. Wild R. Stamper M. Taylor I. McCrea K. Kauristie T. Pulkkinen F. Pitout A. Balogh M. Dunlop H. Rème R. Behlke T. Hansen G. Provan P. Eglitis S. K. Morley D. Alcaydé P.-L. Blelly J. Moen E. Donovan M. Engebretson M. Lester J. Watermann M. F. Marcucci |
author_sort |
M. Lockwood |
title |
Coordinated Cluster, ground-based instrumentation and low-altitude satellite observations of transient poleward-moving events in the ionosphere and in the tail lobe |
title_short |
Coordinated Cluster, ground-based instrumentation and low-altitude satellite observations of transient poleward-moving events in the ionosphere and in the tail lobe |
title_full |
Coordinated Cluster, ground-based instrumentation and low-altitude satellite observations of transient poleward-moving events in the ionosphere and in the tail lobe |
title_fullStr |
Coordinated Cluster, ground-based instrumentation and low-altitude satellite observations of transient poleward-moving events in the ionosphere and in the tail lobe |
title_full_unstemmed |
Coordinated Cluster, ground-based instrumentation and low-altitude satellite observations of transient poleward-moving events in the ionosphere and in the tail lobe |
title_sort |
coordinated cluster, ground-based instrumentation and low-altitude satellite observations of transient poleward-moving events in the ionosphere and in the tail lobe |
publisher |
Copernicus Publications |
publishDate |
2001 |
url |
https://doi.org/10.5194/angeo-19-1589-2001 https://doaj.org/article/06db559b9466449298ef4ba5467e7f15 |
geographic |
Svalbard Longyearbyen |
geographic_facet |
Svalbard Longyearbyen |
genre |
EISCAT Longyearbyen Svalbard |
genre_facet |
EISCAT Longyearbyen Svalbard |
op_source |
Annales Geophysicae, Vol 19, Pp 1589-1612 (2001) |
op_relation |
https://www.ann-geophys.net/19/1589/2001/angeo-19-1589-2001.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-19-1589-2001 0992-7689 1432-0576 https://doaj.org/article/06db559b9466449298ef4ba5467e7f15 |
op_doi |
https://doi.org/10.5194/angeo-19-1589-2001 |
container_title |
Annales Geophysicae |
container_volume |
19 |
container_issue |
10/12 |
container_start_page |
1589 |
op_container_end_page |
1612 |
_version_ |
1766400288531415040 |