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| Titel |
Interplanetary magnetic field rotations followed from L1 to the ground: the response of the Earth's magnetosphere as seen by multi-spacecraft and ground-based observations |
| VerfasserIn |
M. Volwerk, J. Berchem, Y. V. Bogdanova, O. D. Constantinescu, M. W. Dunlop, J. P. Eastwood, P. Escoubet, A. N. Fazakerley, H. Frey, H. Hasegawa, B. Lavraud, E. V. Panov, C. Shen, J. K. Shi, M. G. G. T. Taylor, J. Wang, J. A. Wild, Q. H. Zhang, O. Amm, J. M. Weygand |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 29, no. 9 ; Nr. 29, no. 9 (2011-09-08), S.1549-1569 |
| Datensatznummer |
250017086
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| Publikation (Nr.) |
 copernicus.org/angeo-29-1549-2011.pdf |
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| Zusammenfassung |
| A study of the interaction of solar wind magnetic field rotations with the
Earth's magnetosphere is performed. For this event there is, for the first
time, a full coverage over the dayside magnetosphere with multiple
(multi)spacecraft missions from dawn to dusk, combined with ground
magnetometers, radar and an auroral camera, this gives a unique coverage of
the response of the Earth's magnetosphere. After a long period of southward
IMF Bz and high dynamic pressure of the solar wind, the Earth's
magnetosphere is eroded and compressed and reacts quickly to the turning of
the magnetic field. We use data from the solar wind monitors ACE and Wind and
from magnetospheric missions Cluster, THEMIS, DoubleStar and Geotail to
investigate the behaviour of the magnetic rotations as they move through the
bow shock and magnetosheath. The response of the magnetosphere is
investigated through ground magnetometers and auroral keograms. It is found
that the solar wind magnetic field drapes over the magnetopause, while still
co-moving with the plasma flow at the flanks. The magnetopause reacts quickly
to IMF Bz changes, setting up field aligned currents, poleward
moving aurorae and strong ionospheric convection. Timing of the structures
between the solar wind, magnetosheath and the ground shows that the advection
time of the structures, using the solar wind velocity, correlates well with
the timing differences between the spacecraft. The reaction time of the
magnetopause and the ionospheric current systems to changes in the
magnetosheath Bz seem to be almost immediate, allowing for the
advection of the structure measured by the spacecraft closest to the
magnetopause. |
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