Validation of the k-filtering technique for a signal composed of random phase plane waves and non-random coherent structures

O. W. Roberts, X. Li, L. Jeska

Research output: Contribution to journalArticlepeer-review

11 Citations (SciVal)
214 Downloads (Pure)

Abstract

Recent observations of astrophysical magnetic fields have shown the presence of fluctuations being wavelike (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.

Original languageEnglish
Pages (from-to)247-254
Number of pages8
JournalGeoscientific Instrumentation, Methods and Data Systems
Volume3
Issue number2
DOIs
Publication statusPublished - 23 Dec 2014

Fingerprint

Dive into the research topics of 'Validation of the k-filtering technique for a signal composed of random phase plane waves and non-random coherent structures'. Together they form a unique fingerprint.

Cite this