 |
| Titel |
Spatio-temporal structure of Alfvén waves excited by a sudden impulse localized on an L-shell |
| VerfasserIn |
D. Yu. Klimushkin, P. N. Mager, K.-H. Glassmeier |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 30, no. 7 ; Nr. 30, no. 7 (2012-07-25), S.1099-1106 |
| Datensatznummer |
250017247
|
| Publikation (Nr.) |
 copernicus.org/angeo-30-1099-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| This paper is concerned with the spatial structure and temporal evolution of
the azimuthally small scale Alfvén wave generated by a sudden impulse
concentrated on a given magnetic shell. At the outset, both poloidal and
toroidal components are present in the wave's magnetic field. The oscillation
in the poloidal component on a given magnetic shell is a superposition of two
monochromatic oscillations, one with the local resonance frequency on this
shell, and the other with the frequency corresponding to the resonance
frequency on the source surface. The superposition of these two oscillations
leads to beating. Due to phase mixing, the poloidal component of the
oscillation decreases with time down to zero, transferring its energy to the
toroidal component. Beating in the toroidal component is less pronounced. As
time elapses, energy concentration near the source magnetic shell occurs with
the frequency of the oscillation corresponding to the Alfvénic resonance
frequency on this surface. Outside this thin region wave amplitudes become
rather small at oscillation frequencies corresponding to the local resonance
frequency of the respective magnetic shell. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|