 |
| Titel |
Dispersive MHD waves and alfvenons in charge non-neutral plasmas |
| VerfasserIn |
K. Stasiewicz, J. Ekeberg |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1023-5809
|
| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 15, no. 4 ; Nr. 15, no. 4 (2008-08-08), S.681-693 |
| Datensatznummer |
250012720
|
| Publikation (Nr.) |
 copernicus.org/npg-15-681-2008.pdf |
|
|
|
|
|
| Zusammenfassung |
| Dispersive properties of linear and nonlinear MHD waves, including shear,
kinetic, electron inertial Alfvén, and slow and fast magnetosonic waves are
analyzed using both analytical expansions and a novel technique of dispersion
diagrams. The analysis is extended to explicitly include space charge effects
in non-neutral plasmas. Nonlinear soliton solutions, here called alfvenons,
are found to represent either convergent or divergent electric field
structures with electric potentials and spatial dimensions similar to those
observed by satellites in auroral regions. Similar solitary structures are
postulated to be created in the solar corona, where fast alfvenons can
provide acceleration of electrons to hundreds of keV during flares. Slow
alfvenons driven by chromospheric convection produce positive potentials that
can account for the acceleration of solar wind ions to 300–800 km/s. New
results are discussed in the context of observations and other theoretical
models for nonlinear Alfvén waves in space plasmas. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|