Ionospheric signatures of dayside magnetopause transients - A case study using satellite and ground measurements

Details Ionospheric signatures of dayside magnetopause transients - A case study using satellite and ground measurements Ionospheric signatures of dayside magnetopause transients - A case study using satellite and ground measurements

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.5969d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A4, p. 5969-5980.

Physics

30

All Sky Photography, Auroral Zones, Interplanetary Magnetic Fields, Ionograms, Magnetopause, Satellite Observation, Charge Coupled Devices, Daytime, Dmsp Satellites, Electron Precipitation, Space Plasmas

Scientific paper

A case study is presented of coordinated ground and space measurements featuring a set of transient, auroral fragments located on the poleward side of a stable cusp/cleft arc. Optical ground data from Svalbard and Franz Josef Land were combined with DMSP F9 satellite measurements to examine the characteristics of these auroral features. A stable red arc stretched across most of the dayside auroral zone in a region dominated by westward convection in accordance with the orientation of the IMF. Poleward of the red arc were several westward moving auroral jets resembling midday auroral breakup events, which may be ground signatures of transitory magnetic merging at the dayside magnetopause. If so, the driven convective motion of these structures should contribute to the polar cap potential. Although the transitory structures have an inherent potential associated with the motion of the optical signatures, the structures on the whole contribute a small fraction of the total polar cap potential.

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