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| Titel |
Association of Alfvén waves and proton cyclotron waves with electrostatic bipolar pulses: magnetic hole events observed by Polar |
| VerfasserIn |
G. S. Lakhina, B. T. Tsurutani, J. Pickett |
| 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 ; 11, no. 2 ; Nr. 11, no. 2 (2004-04-14), S.205-213 |
| Datensatznummer |
250009132
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| Publikation (Nr.) |
 copernicus.org/npg-11-205-2004.pdf |
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| Zusammenfassung |
| Two magnetic hole events observed by Polar on 20 May 1996 when it was in the polar
cap/polar cusp boundary layer are studied. Low-frequency waves, consisting of nonlinear
Alfvén waves and large amplitude (±14nT peak-to-peak) obliquely propagating
proton cyclotron waves (with frequency f~0.6 to 0.7 fcp), accompanied by
electric bipolar pulses (electron holes) and electron heating have been observed
located within magnetic holes. It is shown that low-frequency waves can provide
free energy to drive some high frequency instabilities which saturate by
trapping electrons, thus, leading to the generation of electron holes. |
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