 |
| Titel |
Waves in high-speed plasmoids in the magnetosheath and at the magnetopause |
| VerfasserIn |
H. Gunell, G. Stenberg Wieser, M. Mella, R. Maggiolo, H. Nilsson, F. Darrouzet, M. Hamrin, T. Karlsson, N. Brenning, J. De Keyser, M. André, I. Dandouras |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 32, no. 8 ; Nr. 32, no. 8 (2014-08-22), S.991-1009 |
| Datensatznummer |
250121097
|
| Publikation (Nr.) |
 copernicus.org/angeo-32-991-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| Plasmoids, defined here as plasma entities with a higher
anti-sunward velocity component than the surrounding plasma,
have been observed in the
magnetosheath in recent years. During the month of March 2007 the Cluster
spacecraft crossed the magnetopause near the subsolar point 13 times.
Plasmoids with larger velocities than the surrounding magnetosheath
were found on seven of these 13 occasions.
The plasmoids approach the magnetopause and interact with it.
Both whistler mode waves and waves in the lower hybrid frequency range
appear in these plasmoids, and the energy density of the waves inside
the plasmoids is higher than the average wave energy density in the
magnetosheath.
When the spacecraft are in the magnetosphere, Alfvénic waves are
observed. Cold ions of ionospheric origin are seen in connection
with these waves, when the wave electric and magnetic fields combine
with the Earth's dc magnetic field
to yield an E × B/B2 drift speed that is large
enough to give the ions energies above the detection threshold. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|