Observation of electromagnetic ion cyclotron waves and hot plasma in the polar cusp

Details Observation of electromagnetic ion cyclotron waves and hot plasma in the polar cusp Observation of electromagnetic ion cyclotron waves and hot plasma in the polar cusp

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..421e&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, May 1988, p. 421-424.

Physics

28

Electromagnetic Radiation, High Temperature Plasmas, Ion Cyclotron Radiation, Polar Cusps, Field Aligned Currents, Interplanetary Magnetic Fields, Magnetic Field Configurations, Satellite Observation

Scientific paper

On July 24, 1986, narrow band magnetic field fluctuations were observed by VIKING near the apogee altitude of 13,500 km in the polar-cusp region during a period of strong southward interplanetary magnetic field (IMF). The VIKING magnetic field experiment obtained vector magnetic field measurements up to nearly the proton cyclotron frequency f(H) = 28 Hz. Simultaneously, magnetosheathlike electrons and ions as well as an upward-flowing field-aligned current were observed. The most intense flux of electrons and ions were colocated with a 35-nT depression in the total magnetic field strength of 1860 nT, interpreted as a diamagnetic effect. The density of magnetosheathlike plasma, estimated from the diamagnetic depression, reached about 500/cu cm. This extremely high density was also consistent with total plasma density estimates using high-frequency waves. Magnetic field fluctuations were observed from 18 to 27 Hz; they occurred when the magnetic field strength depression was maximum. These waves were left-hand elliptically polarized with ellipticity between 0.2 and 0.3, and may propagate in the Alfven-ion cyclotron branch of the cold electromagnetic dispersion relation. Possible free-energy sources included anisotropies in the electron and ion distributions.

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