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| Titel |
Determination of wave vectors using the phase differencing method |
| VerfasserIn |
S. N. Walker, I. Moiseenko |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 31, no. 9 ; Nr. 31, no. 9 (2013-09-27), S.1611-1617 |
| Datensatznummer |
250086113
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| Publikation (Nr.) |
 copernicus.org/angeo-31-1611-2013.pdf |
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| Zusammenfassung |
| Due to the collisionless nature of space plasmas, plasma waves play an
important role in the redistribution of energy between the various particle
populations in many regions of geospace. In order to fully comprehend such
mechanisms it is necessary to characterise the nature of the waves present.
This involves the determination of properties such as wave vector k.
There are a number of methods used to calculate k based on the
multipoint measurements that are now available. These methods rely on the
fact that the same wave packet is simultaneously observed at two or more
locations whose separation is small in comparison to the correlation length
of the wave packet. This limitation restricts the analysis to low frequency
(MHD) waves. In this paper we propose an extension to the phase differencing
method to enable the correlation of measurements that were not made
simultaneously but differ temporally by a number of wave periods. The method
is illustrated using measurements of magnetosonic waves from the Cluster
STAFF search coil magnetometer. It is shown that it is possible to identify
wave packets whose coherence length is much less than the separation between
the measurement locations. The resulting dispersion is found to agree with
theoretical results. |
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