Observations of a transverse magnetic field perturbation at two altitudes on the equatorward edge of the magnetospheric cusp

Details Observations of a transverse magnetic field perturbation at two altitudes on the equatorward edge of the magnetospheric cusp Observations of a transverse magnetic field perturbation at two altitudes on the equatorward edge of the magnetospheric cusp

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9821463p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A12, p. 21,463-21,470

Other

8

Earth Magnetosphere, Field Aligned Currents, Magnetic Signatures, Magnetohydrodynamic Waves, Perturbation, Planetary Magnetic Fields, Space Plasmas, Dynamics Explorer 1 Satellite, Exos-D Satellite, Geomagnetism, Magnetic Field Configurations, Magnetometers, Mass Spectroscopy

Scientific paper

On January 28, 1990, the Dynamic Explorer 1 (DE-1) and Akebono satellites crossed a magnetic field structure at the equatorward edge of the polar cusp at altitudes od 22,000 and 5000 km, respectively, within 6 min of each other. Locally measured plasma particles and fields and magnetometer data from a ground station near the foot of the magnetic field line are more consistent with an interpretation of the structure as that of a standing Alfven wave than that of a quasi-steady field-aligned current sheet. We discuss the observations supporting this conclusion and other related observations of field-aligned currents, Alfven waves, and ion energization near the equatorward edge of the cusp. These observations suggest that Alfven waves are commonly present near the equatorward edge of the cusp.

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