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| Titel |
Ion cyclotron wave storms in the solar wind: constraint on source region |
| VerfasserIn |
Lan Jian, Hanying Wei, Christopher Russell, Janet Luhmann, Xochitl Blanco-Cano |
| 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 |
250093791
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| Publikation (Nr.) |
 EGU/EGU2014-8861.pdf |
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| Zusammenfassung |
| Ion cyclotron waves have been observed in the solar wind at several heliocentric distances.
Statistical study on these waves shows that they are probably generated in the solar corona
and carried outward by the solar wind. Among these ion cyclotron wave observations, there is
a special group of events in which waves last for over half an hour (called ICW storms) and
have co-existing right-handed and left-handed waves. These waves have the properties
expected for left-handed in the solar wind frame but are Doppler-shifted in the
spacecraft frame, with Sunward-propagating waves shifted to higher frequency, and
anti-Sunward-propagating waves shifted to lower frequency or even reversed in polarity.
Assuming both left-handed and right-handed waves are generated by pickup ion at same
location, we estimate the pickup ion’s initial velocity is typically one third of the solar wind
velocity and three times the Alfven velocity. We also use the wave frequency to
find the source region of these waves and compare with hybrid simulation results. |
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