Characteristics of Pc 4,5 pulsations and their source mechanisms

Details Characteristics of Pc 4,5 pulsations and their source mechanisms Characteristics of Pc 4,5 pulsations and their source mechanisms

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.217..663r&link_type=abstract

In ESA Achievements of the Intern. Magnetospheric Study (IMS) p 663-666 (SEE N85-24544 14-46)

Physics

Geomagnetic Pulsations, Kelvin-Helmholtz Instability, Magnetopause, Magnetospheric Instability, International Magnetospheric Study, Magnetic Storms, Plasma Interactions, Plasma Layers

Scientific paper

Energy supply from Kelvin-Helmholtz instabilities (K-H) on the magnetopause boundary to Pc 4,5 pulsations is discussed. International Magnetospheric Studies data support this possibility except that the K-H most likely occurs in the shear zone across the interface separating the low latitude boundary layer and central plasma sheet. Changes in the frequency-spectra and power of pulsations in intervals with changes in magnetospheric substorm activity suggest an intimate connection between dayside Pc 4,5 and substorms. The Pc 4,5 pulsations, substorm-associated Ps 6 variations and westward traveling surges may all be manifestations of K-H's at the interface between the low latitude boundary layer and the central plasma sheet.

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