Physics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.2405w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, March 1, 1990, p. 2405-2418.
Physics
27
Earth Magnetosphere, Geomagnetism, Ionospheric Currents, Magnetic Signatures, Plasma Clouds, Electric Current, Electrostatics, Field Aligned Currents, Flux Transfer Events, Hall Effect
Scientific paper
Recent magnetic and optical observations of the cusp ionosphere indicate the presence of elongated plasma clouds (EPCs) in the magnetosphere. Based on observations, a self-consistent current system in the cusp ionosphere is modeled for elongated plasma clouds, which are allowed to move in any given direction. The current system consists of the Pedersen current, the Hall current, and the field-aligned current. It is found that the distribution of the field-aligned current of EPCs is quite different from the case with a circular cross-section. The plasma convection pattern and the convection electric field are also obtained. The current and convection patterns are highly dependent on the orientation of the convection velocity. It is found that, for a moving plasma cloud with a circular cross-section, only unipolar profiles of the vertical magnetic field can be observed by a ground observer. However, for a moving plasma cloud with an elongated cross-section, both unipolar and bipolar profiles can be observed.
Lee Clarence L.
Wei C. Q.
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