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| Titel |
Fast magnetosonic wave excitation by an array of wires with time-modulated currents |
| VerfasserIn |
G. Sanchez-Arriaga, J. R. Sanmartin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 28, no. 2 ; Nr. 28, no. 2 (2010-02-18), S.577-586 |
| Datensatznummer |
250016785
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| Publikation (Nr.) |
 copernicus.org/angeo-28-577-2010.pdf |
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| Zusammenfassung |
| The excitation of Fast Magnetosonic (FMS) waves by a cylindrical array of
parallel tethers carrying time-modulated current is discussed. The tethers
would fly vertical in the equatorial plane, which is perpendicular to the
geomagnetic field when its tilt is ignored, and would be stabilized by the
gravity gradient. The tether array would radiate a single FMS wave. In the
time-dependent background made of geomagnetic field plus radiated wave,
plasma FMS perturbations are excited in the array vicinity through a
parametric instability. The growth rate is estimated by truncating the
evolution equation for FMS perturbations to the two azimuthal modes of
lowest order. Design parameters such as tether length and number, required
power and mass are discussed for Low Earth Orbit conditions. The
array-attached wave structure would have the radiated wave controlled by the
intensity and modulation frequency of the currents, making an active
experiment on non-linear low frequency waves possible in real space plasma
conditions. |
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