Electromagnetic ion cyclotron waves stimulated by modest magnetospheric compressions

Details Electromagnetic ion cyclotron waves stimulated by modest magnetospheric compressions Electromagnetic ion cyclotron waves stimulated by modest magnetospheric compressions

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9811369a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A7, p. 11,369-11,382.

Computer Science

Sound

69

Electromagnetic Pulses, Geomagnetic Micropulsations, Geomagnetism, Ion Cyclotron Radiation, Plasma Compression, Satellite Sounding, Ampte (Satellites), Space Plasmas

Scientific paper

AMPTE/CCE magnetic field and particle data are used to test the suggestion that increased hot proton temperature anisotropy resulting from convection during magnetospheric compression is responsible for the enhancement in Pc 1 emission via generation of electromagnetic ion cyclotron (EMIC) waves in the dayside outer equatorial magnetosphere. The relative increase in magnetic field is used to gauge the strength of the compression, and an image dipole model is used to estimate the motion of the plasma during compression. Proton data are used to analyze the evolution of the proton distribution and the corresponding changes in EMIC wave activity expected during the compression. It is suggested that enhancements in dynamic pressure pump the energetic proton distributions in the outer magnetosphere, driving EMIC waves. Waves are expected to be generated most readily close to the magnetopause, and transient pressure pulses may be associated with bursts of EMIC waves, which would be observed on the ground in association with ionospheric transient signatures.

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