Magnetospheric wave characteristics derived from cross-spectral analysis

Details Magnetospheric wave characteristics derived from cross-spectral analysis Magnetospheric wave characteristics derived from cross-spectral analysis

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.217..723p&link_type=abstract

In ESA Achievements of the Intern. Magnetospheric Study (IMS) p 723-728 (SEE N85-24544 14-46)

Physics

Earth Magnetosphere, Magnetohydrodynamic Waves, Spectral Emission, Spectrum Analysis, Very Low Frequencies, Cyclotron Frequency, Dawn Chorus, Power Spectra, Propagation Modes, Spectrograms

Scientific paper

Analysis of GEOS correlator data shows that the cross-spectral phase is a better indicator of wave presence than the spectral power. Regions of no apparent signal between VLF chorus elements seen on power spectrograms show up as periods of wave activity when cross-spectral phase is viewed. A study of the variation of cross-spectral phase with frequency and time can yield information on the propagation characteristics of the waves. Results indicate that the power gap observed in VLF signals at half the electron cyclotron frequency is not present in the cross-spectral phase. The latter varies in a consistent manner through the gap.

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