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| Titel |
Properties of waves in the range of several Hz associated with interplanetary shocks |
| VerfasserIn |
Oleksandr Goncharov, Zdenek Nemecek, Jana Safrankova, Lubomir Prech, Georgy N. Zastenker |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250105166
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| Publikation (Nr.) |
 EGU/EGU2015-4619.pdf |
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| Zusammenfassung |
| The interplanetary (IP) shocks are often associated with high-frequency (several Hz) wave
packets in both upstream and downstream regions. These waves could be resolved only in fast
magnetic field data because the time resolution of plasma instruments is often insufficient for
their detection. The BMSW instrument onboard the Spektr-R spacecraft measures solar wind
parameters with a resolution of 32Âms and allows a detailed analysis of these waves. Since
the magnetometer onboard Spektr R is not in operation, we compare its plasma observations
with Wind fast magnetic field measurements. Our analysis of low-Mach-number
fast forward shocks have shown that (1) the wavelengths of both upstream and
downstream waves conserve over the spacecraft separation, (2) in the frequency
range of 0.5–5 Hz, their wavelengths are directly proportional to the shock ramp
thickness that is controlled by the ion thermal gyroradius, and (3) the phase shift
between density and temperature variations within downstream wave packets is
about 90°. These results emphasize a role of kinetic processes in the formation of
low-Mach number shocks. We discuss a nature of these waves and their properties. |
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