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| Titel |
CRRES/Ground-based multi-instrument observations of an interval of substorm activity |
| VerfasserIn |
T. K. Yeoman, H. Lühr, R. W. H. Friedel, S. Coles, M. Grandé, C. H. Perry, Mark Lester, P. N. Smith, H. J. Singer, D. Orr |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 12, no. 12 ; Nr. 12, no. 12, S.1158-1173 |
| Datensatznummer |
250011246
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| Publikation (Nr.) |
 copernicus.org/angeo-12-1158-1994.pdf |
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| Zusammenfassung |
| 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 CRRES and 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 propagation of the injection of
magnetospheric particle populations 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. |
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