Phase coherence analysis of a field line resonance and solar wind oscillation

Title: Phase coherence analysis of a field line resonance and solar wind oscillation
Creator: Fenrich, F. R.; Waters, C. L.
Relation: Geophysical Research Letters Vol. 35, Issue 20
Publisher Link: http://dx.doi.org/10.1029/2008gl035430
Publisher: American Geophysical Union
Resource Type: journal article
Date: 2008
Description: Discrete field line resonances (FLRs) are a common occurrence in the magnetosphere. However, the source of the stable, discrete FLR frequencies is still an unresolved problem. Recent work has proposed that discrete, continuous oscillations in the solar wind directly drive magnetospheric FLRs. However, these studies have only concentrated on common frequency and amplitude comparisons. This paper presents a new technique which utilizes either Fast Fourier Transform or wavelet crossphase measurements to demonstrate a high degree of phase coherence between a 1.7 mHz FLR observed with the SuperDARN Kodiak radar and ACE SWE oscillations in solar wind plasma density. A statistical analysis which simulates the solar wind as red noise indicates with 99% confidence that the FLR oscillation is the same as the solar wind plasma density variation.
Subject: field line resonance; solar wind–magnetosphere interaction; magnetospheric physics; MHD waves and instabilities
Identifier: http://hdl.handle.net/1959.13/41485
Identifier: uon:4825
Identifier: ISSN:0094-8276
Language: eng
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