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| Titel |
High-frequency waves associated with quasi-perpendicular interplanetary shocks |
| VerfasserIn |
Oleksandr Goncharov, Jana Safrankova, Zdenek Nemecek, Lubomir Prech, Alexander Pitna, Georgy Zastenker |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250087483
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| Publikation (Nr.) |
 EGU/EGU2014-1534.pdf |
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| Zusammenfassung |
| Interplanetary shocks are frequently associated with high-frequency (several Hz) wave
packets in upstream and downstream regions. These waves can be resolved in fast magnetic
field data but the time resolution of plasma instruments is insufficient for their detection. The
BMSW instrument onboard the Russian Spektr-R spacecraft measures solar wind parameters
with a unique resolution of 32ms and open new ways to detailed analysis of these
waves.
In this paper, we present a study of the waves in regions adjacent to interplanetary shocks
observed in course of the 2011–2013 years. We have identified about 25IP shocks with
clear high-frequency wavy signatures in plasma parameters. In our list, shocks are
quasi-perpendicular (θBn > 60°) and have low magnetosonic Mach numbers (Mms -¤ 3).
Since the magnetometer onboard Spektr-R is not in operation, we compare BMSW
observations with Wind fast magnetic field measurements. We conclude that (1) density
variations observed by the BMSW instrument are similar to those observed by the
Wind magnetometer, and (2) the best scaling parameter for their wavelength is
the proton thermal gyroradius. It suggests that these waves would be of kinetic
nature. |
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