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| Titel |
Two-component magnetic helicity for two-component turbulent fluctuations |
| VerfasserIn |
JianSen He, Chuanyi Tu, Eckart Marsch, Shuo Yao, Hui Tian |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250050290
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| Zusammenfassung |
| It is believed that the solar wind turbulence may consist of Alfvenic wave fluctuations. The
identification of wave modes in the solar wind turbulence becomes an important issue. Some
methods have been adopted to diagnose the possible wave characteristics, e.g., transport ratio
of E to B in Bale et al. (2005), dispersion relation derived from k-filtering result by Sahraoui
et al. (2010). Previous study results tend to attribute the solar turbulence to be mainly
cascaded via (quasi-)perpendicular waves like kinetic Alfven wave or whistler wave, while
the (quasi-)parallel Alfven cyclotron wave that may be crucial for perpendicular heating ions
is often neglected.
This study presents the wave characteristics of the solar wind turbulence from the
perspective of magnetic helicity. The reduced fluctuating magnetic helicity (sigma_m) is
investigated as a function of the angle between solar wind velocity and local mean magnetic
field (theta_VB). We find that, in the solar wind outward magnetic sector sigma_m is
clearly negative in theta_VB |
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