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| Titel |
Radial versus temporal evolution of fast stream turbulence in the solar wind |
| VerfasserIn |
Zoltan Voros, Manfred Leubner, Tielong Zhang, Martin Volwerk, Andrea Opitz, Roberto Bruno |
| 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 |
250053453
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| Zusammenfassung |
| The solar wind shows a clear non-adiabatic radial temperature profile indicating that some
local sources heat the plasma. Turbulence is one of the physical processes which
can dissipate the available energy, representing an additional heat source in the
solar wind. However, the radial evolution of turbulence is not fully understood. The
spatial and temporal evolution (e.g. decaying turbulence) of fluctuations is rather
undifferentiated. Here we analyze the multi-scale properties of turbulence in the same fast
wind streams, using data from spacecraft located at ~ 1AU and also at different
heliocentric distances. We investigate the radial dependence of fluctuations on the basis of
MESSENGER (~ 0.4AU), VENUS EXPRESS (~ 0.7AU), near-Earth probes
(ACE/WIND at ~ 1AU) and ULYSSES (~ 1.4AU) measurements. For the same
streams, the mostly temporal evolution of fluctuations is studied using data from
STEREO and near-Earth probes at ~ 1AU. The STEREO mission consists of two
identical spacecraft, one ahead of the Earth in its orbit, the other trailing behind, with
increasing distance between the spacecraft and the Earth in time. The spatio-temporal
evolution of correlation length and small-scale intermittency will be presented. |
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