Physics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.5692g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 88, July 1, 1983, p. 5692-5708.
Physics
117
Atmospheric Electricity, Auroral Zones, Earth Magnetosphere, Electron Precipitation, Geomagnetism, Kp Index, Convection Currents, Diffuse Radiation, Diurnal Variations, Dmsp Satellites, Electric Field Strength, Electron Flux Density, Indexes, Magnetic Variations, Plasma Layers, Polar Regions
Scientific paper
Systematic variations of the equatorward diffuse auroral boundary with K(p) are statistically determined as a function of local time, on the basis of DMSP/F2 and F4 satellites' precipitating electron data. The equatorward diffuse auroral boundary is well fit at each activity level by a circle whose center is offset from the geomagnetic pole, and whose radius increases with magnetic activity. Previously encountered electric field variations with K(p) are confirmed, including a rotation of the axis of symmetry away from the dawn-dusk meridian. Using the equations for boundary variations with K(p), each evening sector boundary was projected to a midnight boundary which serves as both an index of auroral activity and an indicator of the strength of the large scale magnetospheric convection electric field.
Gussenhoven Susan M.
Hardy David A.
Heinemann N.
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