Ground-based observations of an isolated substorm |
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| Authors: | B Theile H Maurer E Nielsen RA Greenwald A Ranta |
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| Institution: | 1. Institut für Geophysik und Meteorologie der TU Braunschweig, Mendelssohnstr. 1A, D-3300 Braunschweig, Federal Republic of Germany;2. Max-Planck-Institut für Aeronomie, Postfach 60, D3411 Katlenburg-Lindau 3, Federal Republic of Germany;3. Geophysical Observatory, SF-99600 Sodankylä, Finland |
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| Abstract: | An isolated substorm occurred in Northern Scandinavia on 1 March, 1977 around magnetic midnight. The ionospheric phenomena associated with this substorm were studied by ground magnetometers, the Scandinavian Twin Auroral Radar Experiment (STARE), riometers and an all-sky camera. The physical properties of the auroral electrojet are determined from the ground magnetic field and the ionospheric electric field data. Mid and low latitude magnetic field data show evidence of field-aligned current flow. It is shown that the enhancement of the electrojet's current density is essentially determined by an increase in the ionospheric conductivity. The current system derived from the data of this study corresponds to a model of Yasuhara et al. (1975a). |
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