Ponderomotive effects in magnetospheric hydromagnetic waves (*)
The ponderomotive force (PMF) is a ubiquitous nonlinear wave effect arising in plasma physics when applied wave fields or plasma parameters have significant spatial gradients. Some basic properties of the PMF are described as they relate to ULF hydromagnetic waves in the magnetosphere. Examples are...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
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| Series: | Annales Geophysicae |
| Online Access: | http://www.ann-geophys.net/14/893/1996/angeo-14-893-1996.html |
| _version_ | 1811248582479577088 |
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| author | W. Allan J. R. Manuel |
| author_facet | W. Allan J. R. Manuel |
| author_sort | W. Allan |
| collection | DOAJ |
| description | The ponderomotive force (PMF) is a ubiquitous nonlinear wave effect arising in plasma physics when applied wave fields or plasma parameters have significant spatial gradients. Some basic properties of the PMF are described as they relate to ULF hydromagnetic waves in the magnetosphere. Examples are given of recent results obtained using both analytical and numerical techniques for waves from the lowest frequencies (determined by the dimensions of the magnetosphere) up to the vicinity of the ion cyclotron frequency. These results include the possibilities that the PMF may transport plasma over large distances in the magnetosphere, and that the PMF may energize magnetospheric ions significantly. In particular the PMF may play a role in transporting and energizing O<sup>+</sup> ions from the ionosphere into the body of the magnetosphere. The PMF can also generate nonlinear coupling between the slow magnetosonic mode and the other hydromagnetic modes. This should lead to limitation of density enhancements and, notably in the case of standing Alfvén waves, to spatial harmonic generation, secularly growing frequency shifts, and saturation of driven wave fields. Some implications of these results for the magnetosphere are discussed. |
| first_indexed | 2024-04-12T15:31:44Z |
| format | Article |
| id | doaj.art-beb63f4f81444c8aa88ef3d346f5be15 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-04-12T15:31:44Z |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-beb63f4f81444c8aa88ef3d346f5be152022-12-22T03:27:06ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-0576149893905Ponderomotive effects in magnetospheric hydromagnetic waves (*)W. AllanJ. R. ManuelThe ponderomotive force (PMF) is a ubiquitous nonlinear wave effect arising in plasma physics when applied wave fields or plasma parameters have significant spatial gradients. Some basic properties of the PMF are described as they relate to ULF hydromagnetic waves in the magnetosphere. Examples are given of recent results obtained using both analytical and numerical techniques for waves from the lowest frequencies (determined by the dimensions of the magnetosphere) up to the vicinity of the ion cyclotron frequency. These results include the possibilities that the PMF may transport plasma over large distances in the magnetosphere, and that the PMF may energize magnetospheric ions significantly. In particular the PMF may play a role in transporting and energizing O<sup>+</sup> ions from the ionosphere into the body of the magnetosphere. The PMF can also generate nonlinear coupling between the slow magnetosonic mode and the other hydromagnetic modes. This should lead to limitation of density enhancements and, notably in the case of standing Alfvén waves, to spatial harmonic generation, secularly growing frequency shifts, and saturation of driven wave fields. Some implications of these results for the magnetosphere are discussed.http://www.ann-geophys.net/14/893/1996/angeo-14-893-1996.html |
| spellingShingle | W. Allan J. R. Manuel Ponderomotive effects in magnetospheric hydromagnetic waves (*) Annales Geophysicae |
| title | Ponderomotive effects in magnetospheric hydromagnetic waves (*) |
| title_full | Ponderomotive effects in magnetospheric hydromagnetic waves (*) |
| title_fullStr | Ponderomotive effects in magnetospheric hydromagnetic waves (*) |
| title_full_unstemmed | Ponderomotive effects in magnetospheric hydromagnetic waves (*) |
| title_short | Ponderomotive effects in magnetospheric hydromagnetic waves (*) |
| title_sort | ponderomotive effects in magnetospheric hydromagnetic waves |
| url | http://www.ann-geophys.net/14/893/1996/angeo-14-893-1996.html |
| work_keys_str_mv | AT wallan ponderomotiveeffectsinmagnetospherichydromagneticwaves AT jrmanuel ponderomotiveeffectsinmagnetospherichydromagneticwaves |