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Dynamic cross correlation studies of wave particle interactions in ULF phenomenaMagnetic field observations made by satellites in the earth's magnetic field reveal a wide variety of ULF waves. These waves interact with the ambient particle populations in complex ways, causing modulation of the observed particle fluxes. This modulation is found to be a function of species, pitch angle, energy and time. The characteristics of this modulation provide information concerning the wave mode and interaction process. One important characteristic of wave-particle interactions is the phase of the particle flux modulation relative to the magnetic field variations. To display this phase as a function of time a dynamic cross spectrum program has been developed. The program produces contour maps in the frequency time plane of the cross correlation coefficient between any particle flux time series and the magnetic field vector. This program has been utilized in several studies of ULF wave-particle interactions at synchronous orbit.
Document ID
19790057372
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mcpherron, R. L.
(California, University Los Angeles, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
April 1, 1979
Subject Category
Geophysics
Accession Number
79A41385
Funding Number(s)
CONTRACT_GRANT: NAS5-23702
Distribution Limits
Public
Copyright
Other

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