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| Titel |
ULF/ELF monochromatic oscillations observed by Prognoz-8 and -10 spacecrafts during quasiperpendicular supercritical shock crossings |
| VerfasserIn |
M. N. Nozdrachev, A. A. Petrukovich, J. Juchniewicz |
| 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 ; 13, no. 6 ; Nr. 13, no. 6, S.573-582 |
| Datensatznummer |
250011878
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| Publikation (Nr.) |
 copernicus.org/angeo-13-573-1995.pdf |
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| Zusammenfassung |
| The present paper analyses electromagnetic
turbulence in the frequency range 0.1–75 Hz, associated with the supercritical
quasiperpendicular crossings of the Earth's bow shock recorded by the Prognoz-8
and -10 satellites. The quasimonochromatic waves are identified in the shock
transition region. Their frequencies, lying in the range 2–5 Hz upstream from
the shock ramp, shift to a value less than 1 Hz in the downstream region. The
amplitudes of these narrow emissions are great enough to provide the primary
dissipation in the flow of the solar wind plasma. Electromagnetic oscillations
with such properties are likely to be generated during non-linear evolution of
the shock front, rather than by the instabilities driven by ion and electron
drifts. Emissions with frequencies higher than 5 Hz have much smaller amplitudes
and may be driven by lower hybrid-like instabilities. |
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