Observations of the cusp region under northward IMF
We present a comparative study of the cusp region using the EISCAT Svalbard Radars (ESR) and the Cluster spacecraft. We focus in this paper on 2 February 2001, over the time period from 07:30 UT to 12:00 UT when the oblique ESR antenna pointing northward at a low elevation recorded latitudin...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2001-09-01
|
| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/19/1641/2001/angeo-19-1641-2001.pdf |
| _version_ | 1811308614139248640 |
|---|---|
| author | F. Pitout F. Pitout J.-M. Bosqued D. Alcaydé W. F. Denig H. Rème |
| author_facet | F. Pitout F. Pitout J.-M. Bosqued D. Alcaydé W. F. Denig H. Rème |
| author_sort | F. Pitout |
| collection | DOAJ |
| description | We present a comparative
study of the cusp region using the EISCAT Svalbard Radars (ESR) and the Cluster
spacecraft. We focus in this paper on 2 February 2001, over the time period
from 07:30 UT to 12:00 UT when the oblique ESR antenna pointing northward at a
low elevation recorded latitudinal motions of the cusp region in response to
the IMF. Meanwhile, the Cluster satellites were flying over the EISCAT Svalbard
Radar field-of-view around local magnetic noon. The spacecraft first flew near
ESR, northeast of Svalbard and then passed over the field-of-view of the
antenna at about 11:30 UT. From 08:00 UT to 09:00 UT, the IMF remains primarily
southward yet several variations in the <i>Z</i>-component are seen to move the
cusp. Around 09:00 UT, an abrupt northward turning of the IMF moves the cusp
region to higher latitudes. As a result, the Cluster satellites ended up in the
northernmost boundary of the high-altitude cusp region where the CIS instrument
recorded highly structured plasma due to ion injections in the lobe of the
magnetosphere. After 09:00 UT, the IMF remains northward for more than two
hours. Over this period, the ESR records sunward plasma flow in the cusp region
due to lobe reconnection, while Cluster spacecraft remain in the high-altitude
cusp.<br><br><b>Key words. </b>Magnetospheric physics
(magnetopause, cusp, and boundary layers; plasma convection) Ionosphere (polar
ionosphere) |
| first_indexed | 2024-04-13T09:26:19Z |
| format | Article |
| id | doaj.art-23b32f4ad1014a3ebdb63cd137529557 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-04-13T09:26:19Z |
| publishDate | 2001-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-23b32f4ad1014a3ebdb63cd1375295572022-12-22T02:52:26ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762001-09-01191641165310.5194/angeo-19-1641-2001Observations of the cusp region under northward IMFF. Pitout0F. Pitout1J.-M. Bosqued2D. Alcaydé3W. F. Denig4H. Rème5Centre d’Etude Spatiale des Rayonnements, 9 avenue du Colonel Roche, F-31028 Toulouse Cedex 4, FranceSwedish Institute of Space Physics, Box 537, 751 21 Uppsala, SwedenCentre d’Etude Spatiale des Rayonnements, 9 avenue du Colonel Roche, F-31028 Toulouse Cedex 4, FranceCentre d’Etude Spatiale des Rayonnements, 9 avenue du Colonel Roche, F-31028 Toulouse Cedex 4, FranceAir Force Research Laboratory, Space Vehicles Directorate, Hanscom AFB, Massachusetts, USACentre d’Etude Spatiale des Rayonnements, 9 avenue du Colonel Roche, F-31028 Toulouse Cedex 4, FranceWe present a comparative study of the cusp region using the EISCAT Svalbard Radars (ESR) and the Cluster spacecraft. We focus in this paper on 2 February 2001, over the time period from 07:30 UT to 12:00 UT when the oblique ESR antenna pointing northward at a low elevation recorded latitudinal motions of the cusp region in response to the IMF. Meanwhile, the Cluster satellites were flying over the EISCAT Svalbard Radar field-of-view around local magnetic noon. The spacecraft first flew near ESR, northeast of Svalbard and then passed over the field-of-view of the antenna at about 11:30 UT. From 08:00 UT to 09:00 UT, the IMF remains primarily southward yet several variations in the <i>Z</i>-component are seen to move the cusp. Around 09:00 UT, an abrupt northward turning of the IMF moves the cusp region to higher latitudes. As a result, the Cluster satellites ended up in the northernmost boundary of the high-altitude cusp region where the CIS instrument recorded highly structured plasma due to ion injections in the lobe of the magnetosphere. After 09:00 UT, the IMF remains northward for more than two hours. Over this period, the ESR records sunward plasma flow in the cusp region due to lobe reconnection, while Cluster spacecraft remain in the high-altitude cusp.<br><br><b>Key words. </b>Magnetospheric physics (magnetopause, cusp, and boundary layers; plasma convection) Ionosphere (polar ionosphere)https://www.ann-geophys.net/19/1641/2001/angeo-19-1641-2001.pdf |
| spellingShingle | F. Pitout F. Pitout J.-M. Bosqued D. Alcaydé W. F. Denig H. Rème Observations of the cusp region under northward IMF Annales Geophysicae |
| title | Observations of the cusp region under northward IMF |
| title_full | Observations of the cusp region under northward IMF |
| title_fullStr | Observations of the cusp region under northward IMF |
| title_full_unstemmed | Observations of the cusp region under northward IMF |
| title_short | Observations of the cusp region under northward IMF |
| title_sort | observations of the cusp region under northward imf |
| url | https://www.ann-geophys.net/19/1641/2001/angeo-19-1641-2001.pdf |
| work_keys_str_mv | AT fpitout observationsofthecuspregionundernorthwardimf AT fpitout observationsofthecuspregionundernorthwardimf AT jmbosqued observationsofthecuspregionundernorthwardimf AT dalcayde observationsofthecuspregionundernorthwardimf AT wfdenig observationsofthecuspregionundernorthwardimf AT hreme observationsofthecuspregionundernorthwardimf |