Millstone Hill incoherent scatter observations of auroral convection over Lambda = 60-75 deg. III - Average patterns versus Kp

Details Millstone Hill incoherent scatter observations of auroral convection over Lambda = 60-75 deg. III - Average patterns versus Kp Millstone Hill incoherent scatter observations of auroral convection over Lambda = 60-75 deg. III - Average patterns versus Kp

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.5505o&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, July 1, 1983, p. 5505-5516.

Physics

51

Auroral Zones, F Region, Incoherent Scatter Radar, Kp Index, Convection, Electric Fields, Electric Potential, Geomagnetism, International Magnetospheric Study, Midlatitude Atmosphere, Polar Caps

Scientific paper

Analytical models of the mean electric field behavior in the auroral zone over the interval between 60 and 75 deg, determined from measurements made in 1978, are described. A separate model is obtained for each of 3 Kp ranges. Each model employs a polynomial description of intensity with invariant latitude and a sinusoidal harmonic variation in local time with 102 deg of freedom for each of the perpendicular electric field components. Each of these average field models is found to be consistent with a two-cell convection pattern having antisunward plasma flow over the pole and return paths eastward and westward through the dawn and dusk meridians. It is noted that the centers of the vortices are near the far limit of observation. The entire convection pattern is seen as rotated by as much as two hours toward earlier local times from the nominal noon-midnight over-the-pole flow direction, although this conclusion is influenced strongly by the least reliable (highest latitude) data. The dusk cell is dominant in size and strength; both the pattern and cell dissimilarity, however, lessen as Kp increases. The Harang discontinuity, which was recognizable on individual days, is for the most part absent in the average patterns, presumably as a result of the variability in its position.

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