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| Titel |
k-filtering applied to Cluster density measurements in the Solar Wind: Early findings |
| VerfasserIn |
Lauren Jeska, Owen Roberts, Xing Li |
| 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 |
250099029
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| Publikation (Nr.) |
 EGU/EGU2014-14769.pdf |
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| Zusammenfassung |
| Studies of solar wind turbulence indicate that a large proportion of the energy is Alfvénic
(incompressible) at inertial scales. The properties of the turbulence found in the
dissipation range are still under debate ~ while it is widely believed that kinetic
Alfvén waves form the dominant component, the constituents of the remaining
compressible turbulence are disputed. Using k-filtering, the power can be measured without
assuming the validity of Taylor’s hypothesis, and its distribution in (Ï, k)-space can be
determined to assist the identification of weak turbulence components. This technique is
applied to Cluster electron density measurements and compared to the power in
|B(t)|. As the direct electron density measurements from the WHISPER instrument
have a low cadency of only 2.2s, proxy data derived from the spacecraft potential,
measured every 0.2s by the EFW instrument, are used to extend this study to ion scales. |
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