Satellite and ground-based observations of a fading transpolar arc

Details Satellite and ground-based observations of a fading transpolar arc Satellite and ground-based observations of a fading transpolar arc

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.5817p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 1, 1990, p. 5817-5824.

Physics

11

Auroral Arcs, Satellite Imagery, Satellite Observation, Ultraviolet Photography, Brightness Distribution, Field Aligned Currents, Interplanetary Magnetic Fields, Magnetic Disturbances, Temporal Distribution, Viking Spacecraft

Scientific paper

Satellite and ground-based observations of the end phase of a transpolar arc event on September 25, 1986, are presented. The event was recorded by the UV imager of the Viking spacecraft during the time period from 2000 to 2110 UT. The transpolar arc was formed during a period of more than one hour of northward directed interplanetary magnetic field B(Z). The arc started to fade when the IMF turned southward and a localized brightening of the auroral oval west of its nightside footpoint was observed. Within a few minutes the activation was strongly enhanced. At the EISCAT magnetometer stations, a counterclockwise rotating equivalent current system, which can be interpreted as due to an upward directed filamentary field-aligned current, was observed to last about 10 min. EISCAT observed clear enhancement of E region electron density after 2100 UT, which was not associated with hard precipitation, as indicated by the absence of riometer absorption over Scandinavia.

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