Mathematics – Logic
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994angeo..12.1158y&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 12, no. 12, p. 1158-1173
Mathematics
Logic
3
Auroras, E Region, Geomagnetic Tail, Luminosity, Magnetic Signatures, Magnetic Storms, Magnetohydrodynamic Stability, Particle Precipitation, Cameras, Charge Coupled Devices, Dmsp Satellites, Eiscat Radar System (Europe), Intervals, Magnetometers
Scientific paper
Observations are presented of data taken during a 3-h interval in which five clear substorm onsets/intensifications took place. During this interval ground-based data from the EISCAT incoherent scatter radar, a digital CCD all sky camera, and an extensive array of magnetometers were recorded. In addition data from the Combined Release and Radiation Effects Satellite (CRRES) and Defense Meteorological Satellite Program (DMSP) spacecraft, whose footprints passed over Scandinavia very close to most of the ground-based instrumentation, are available. The locations and movements of the substorm current system in latitude and longitude, determined from ground and spacecraft magnetic field data, have been correlated with the locations and propagation of increased particle precipitation in the E-region at EISCAT, increased particle fluxes measured by CRRES and DMSP, with auroral luminosity and with ionospheric convection velocities. The onsets and propagations and auroral luminosity have been compared. CRRES was within or very close to the substorm expansion phase onset sector during the interval. The onset region was observed at low latitudes on the ground, and has been confirmed to map back to within L = 7 in the magnetotail. The active region was then observed to propagate tailward and poleward. Delays between the magnetic signature of the substorm field aligned currents and field dipolarisation have been measured. The observations support a near-Earth plasma instability mechanism for substorm expansion phase onset.
Coles S.
Friedel Reiner H. W.
Grande Marco
Lester Mark
Luehr Herman
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