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| Titel |
Validation of the k-filtering technique for a signal composed of random-phase plane waves and non-random coherent structures |
| VerfasserIn |
O. W. Roberts, X. Li, L. Jeska |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2193-0856
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Instrumentation, Methods and Data Systems ; 3, no. 2 ; Nr. 3, no. 2 (2014-12-23), S.247-254 |
| Datensatznummer |
250115227
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| Publikation (Nr.) |
 copernicus.org/gi-3-247-2014.pdf |
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| Zusammenfassung |
| Recent observations of astrophysical magnetic fields have shown the
presence of fluctuations being wave-like (propagating in the plasma
frame) and those described as being structure-like (advected by the
plasma bulk velocity). Typically with single-spacecraft missions it is
impossible to differentiate between these two fluctuations, due to the
inherent spatio-temporal ambiguity associated with a single point
measurement. However missions such as Cluster which contain multiple
spacecraft have allowed for temporal and spatial changes to be
resolved, using techniques such as k filtering. While this technique does
not assume Taylor's hypothesis it requires both weak stationarity of the
time series and that the fluctuations can be described by a superposition
of plane waves with random phases. In this paper we test whether the
method can cope with a synthetic signal which is composed of
a combination of non-random-phase coherent structures with a mean
radius d and a mean separation λ, as well as plane waves
with random phase. |
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