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| Titel |
The role of nonlinear Landau damping and the bounced motion of protons in the formation of dissipative structures in the solar wind plasma |
| VerfasserIn |
M. Prakash, P. H. Diamond |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 6, no. 3/4 ; Nr. 6, no. 3/4, S.161-167 |
| Datensatznummer |
250003220
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| Publikation (Nr.) |
 copernicus.org/npg-6-161-1999.pdf |
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| Zusammenfassung |
| The present work examines the effects arising
from the nonlinear Landau damping and the bounced motion of protons (trapped in
the mirror geometry of the geomagnetic field) in the formation of nonlinear
Alfvénic structures. These structures are observed at distances 1-5AU in the
solar wind plasma (with ß ~ 1). The dynamics of formation of these
structures can be understood using kinetic nonlinear Schrodinger (KNLS) model.
The structures emerge due to balance of nonlinear steepening (of large amplitude
Alfvén waves) by the linear Landau damping of ion-acoustic modes in a finite ß
solar wind plasma. The ion-acoustic mode is driven nonlinearly by the large
amplitude Alfvén waves. At the large amplitudes of Alfvén wave, the effects
due to nonlinear Landau damping become important. These nonlinear effects are
incorporated into the KNLS model by modifying the heat flux dissipation
coefficient parallel to the ambient magnetic field. The effects arising from the
bounced motion (of mirroring protons) are studied using a one-dimensional Vlasov
equation. The bounced motion of the protons can lead to growth of the
ion-acoustic mode, propagating in the mirror geometry of the geomagnetic field.
The significance of these studies in the formation of dissipative
quasistationary structures observed in solar wind plasma is discussed. |
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