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| Titel |
Estimates of the field-aligned current density in current-carrying filaments using auroral zone ground-based observations |
| VerfasserIn |
M. A. Danielides, S. Shalimov, J. Kangas |
| 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 ; 19, no. 7 ; Nr. 19, no. 7, S.699-706 |
| Datensatznummer |
250014282
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| Publikation (Nr.) |
 copernicus.org/angeo-19-699-2001.pdf |
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| Zusammenfassung |
We described the ground
signatures of dynamic substorm features as observed by the imaging riometer,
magnetometers and all-sky camera (ASC) at Kilpisjärvi, Finland on 5 and 25
October 1999 during the late evening hours. The magnetometer data was
consistent with the motion of up-ward field-aligned currents (FACs) associated
with absorption patches moving within the field of view of the riometer. We
used riometer data in order to estimate the intensity of FACs associated with
these local current-carrying filaments. It is shown that during these events,
the estimated FAC intensity exceeds a threshold value that corresponds to the
excitation of the low-frequency turbulence in the upper ionosphere. As a
result, a quasi-oscillating regime of anomalous resistivity on the auroral
field lines can give rise to the burst-like electron acceleration responsible
for simultaneously observed auroral forms and bursts of Pi1B pulsations.
Key words. Ionosphere (active
experiments; auroral ionosphere; electric fields and currents) |
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