Observations of plasma vortices in the vicinity of flow-braking: a case study
We examine fast plasma flows and magnetic field fluctuations observed by THEMIS at 03:00–03:30 UT on 12 December 2007. All THEMIS probes are situated in the near-Earth plasma sheet (<I>X<sub>SM</sub></I>>−10 <I>R<sub>E</sub></I>) wit...
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Copernicus Publications
2009-08-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/27/3009/2009/angeo-27-3009-2009.pdf |
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doaj-92b9c5aadeb447ea98f2680e4a9067582020-11-25T01:09:04ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762009-08-01273009301710.5194/angeo-27-3009-2009Observations of plasma vortices in the vicinity of flow-braking: a case studyK. Keika0K. Keika1R. Nakamura2M. Volwerk3V. Angelopoulos4W. Baumjohann5A. Retinò6M. Fujimoto7J. W. Bonnell8H. J. Singer9H. U. Auster10J. P. McFadden11D. Larson12I. Mann13Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042 Graz, AustriaCenter for Solar-Terrestrial Research, New Jersey Institute of Technology, 323 Martin-Luther-King Jr. Blvd., 101 Tiernan Hall, Newark, NJ 07102-1982, USASpace Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042 Graz, AustriaSpace Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042 Graz, AustriaInstitute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095, USASpace Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042 Graz, AustriaSpace Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042 Graz, AustriaInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Yoshinodai 3-1-1, Sagamihara 229-8510, JapanSpace Science Laboratory, University of California, 7 Gauss Way #7450, Berkeley, CA 94720-7450, USASpace Weather Prediction Center, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, CO 80305, USAInstitut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig, GermanySpace Science Laboratory, University of California, 7 Gauss Way #7450, Berkeley, CA 94720-7450, USASpace Science Laboratory, University of California, 7 Gauss Way #7450, Berkeley, CA 94720-7450, USADepartment of Physics, University of Alberta, 11322 – 89 Avenue, T6G 2G7 Edmonton, Alberta, CanadaWe examine fast plasma flows and magnetic field fluctuations observed by THEMIS at 03:00–03:30 UT on 12 December 2007. All THEMIS probes are situated in the near-Earth plasma sheet (<I>X<sub>SM</sub></I>>−10 <I>R<sub>E</sub></I>) with 1–2 <I>R<sub>E</sub></I> spacecraft separations in azimuthal and radial directions. We focus on the observations of plasma convective flows made simultaneously by more than one THEMIS probe. At about 03:10 UT and 03:14 UT, the THEMIS P2 probe observed earthward flows of >100 km/s. The THEMIS P1 probe, located duskward and earthward of P2, observed tailward flows under a positive <I>B<sub>z</sub></I>. The inner most probe THEMIS P4, located at almost the same MLT as THEMIS P1 and P2, did not see any clear flow. We examine the convective flow patterns for the THEMIS observations. We conclude that plasma vortices are formed near the region where the earthward flows slow down and turn in azimuthal directions.https://www.ann-geophys.net/27/3009/2009/angeo-27-3009-2009.pdf |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
K. Keika K. Keika R. Nakamura M. Volwerk V. Angelopoulos W. Baumjohann A. Retinò M. Fujimoto J. W. Bonnell H. J. Singer H. U. Auster J. P. McFadden D. Larson I. Mann |
| spellingShingle |
K. Keika K. Keika R. Nakamura M. Volwerk V. Angelopoulos W. Baumjohann A. Retinò M. Fujimoto J. W. Bonnell H. J. Singer H. U. Auster J. P. McFadden D. Larson I. Mann Observations of plasma vortices in the vicinity of flow-braking: a case study Annales Geophysicae |
| author_facet |
K. Keika K. Keika R. Nakamura M. Volwerk V. Angelopoulos W. Baumjohann A. Retinò M. Fujimoto J. W. Bonnell H. J. Singer H. U. Auster J. P. McFadden D. Larson I. Mann |
| author_sort |
K. Keika |
| title |
Observations of plasma vortices in the vicinity of flow-braking: a case study |
| title_short |
Observations of plasma vortices in the vicinity of flow-braking: a case study |
| title_full |
Observations of plasma vortices in the vicinity of flow-braking: a case study |
| title_fullStr |
Observations of plasma vortices in the vicinity of flow-braking: a case study |
| title_full_unstemmed |
Observations of plasma vortices in the vicinity of flow-braking: a case study |
| title_sort |
observations of plasma vortices in the vicinity of flow-braking: a case study |
| publisher |
Copernicus Publications |
| series |
Annales Geophysicae |
| issn |
0992-7689 1432-0576 |
| publishDate |
2009-08-01 |
| description |
We examine fast plasma flows and magnetic field fluctuations observed by
THEMIS at 03:00–03:30 UT on 12 December 2007. All THEMIS probes are
situated in the near-Earth plasma sheet (<I>X<sub>SM</sub></I>>−10 <I>R<sub>E</sub></I>) with 1–2 <I>R<sub>E</sub></I>
spacecraft separations in azimuthal and radial directions. We focus
on the observations of plasma convective flows made simultaneously by more
than one THEMIS probe. At about 03:10 UT and 03:14 UT, the THEMIS P2 probe
observed earthward flows of >100 km/s. The THEMIS P1 probe, located
duskward and earthward of P2, observed tailward flows under a positive
<I>B<sub>z</sub></I>. The inner most probe THEMIS P4, located at almost the same MLT as
THEMIS P1 and P2, did not see any clear flow. We examine the convective flow
patterns for the THEMIS observations. We conclude that plasma vortices are
formed near the region where the earthward flows slow down and turn in
azimuthal directions. |
| url |
https://www.ann-geophys.net/27/3009/2009/angeo-27-3009-2009.pdf |
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