Physics
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.2520g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, March 1, 1989, p. 2520-2528. Research supported by DFG.
Physics
115
Convective Flow, Magnetic Variations, Magnetospheric Instability, Satellite Observation, Space Plasmas, Vortices, Ground Stations, International Magnetospheric Study, Scandinavia, Transient Response
Scientific paper
A peculiar type of short-period magnetic variation has been noted in International Magnetospheric Magnetometer Array observations which involves a positive deflection of the geomagnetic D component from the quiet time level; the disturbance of the H component approximately represents the negative time derivative of the D component. Most events were observed during moderately quiet times. A more detailed analysis of two events reveals a two-cell equivalent current vortex structure. Simultaneous GEOS 2 magnetic field observations of one of these events support their interpretation as pairs of downward (in the west) and upward (in the east) field-aligned currents in the magnetosphere.
Glassmeier Karl-Heinz
Hoenisch Michael
Untiedt Juergen
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