Cleft currents determined from magnetic and electric fields

Details Cleft currents determined from magnetic and electric fields Cleft currents determined from magnetic and electric fields

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.5604w&link_type=abstract

Journal of Geophysical Research, vol. 83, Dec. 1, 1978, p. 5604-5616. Research supported by the National Research Council of Ca

Computer Science

Sound

Auroral Electrojets, Electric Fields, Ionospheric Currents, Ionospheric Sounding, Magnetic Fields, Satellite Observation, Atmospheric Models, Field Aligned Currents, Ionograms, Ionospheric Conductivity, Isis Satellites, Magnetic Measurement, Magnetohydrodynamic Stability, Statistical Analysis, Upper Ionosphere

Scientific paper

Cleft region electric fields and ionospheric observations are used to calculate cleft currents and their magnetic fields, which are compared with ground-based magnetic observations. Rockets were launched through the postnoon cleft region from Cape Parry, Canada, to determine the electric fields, electron energy flux, and energetic particles (over 70 keV). Bottomside and Isis 1 and 2 topside ionograms, all-sky photographs, and visual observations of aurora are used to determine empirical models of the cleft ionosphere. The conductivities of these ionospheric models are calculated and combined to form representative cross sections of the cleft region during the rocket flights. Currents are calculated, and their magnetic fields are determined and compared with the observations. Because most of the east-west electrojets are in oppositely flowing pairs, their magnetic fields cancel at the earth's surface. Currents flowing in the meridional plane are completed by field-aligned currents flowing outward above the arcs and inward at discontinuities in the ionosphere or electric field. Some of the field-aligned currents above the arcs could exceed the critical current of the topside ionosphere and possibly cause instabilities in these regions, which could in turn energize the auroral particles.

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