Physics
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86...65v&link_type=abstract
Journal of Geophysical Research, vol. 86, Jan. 1, 1981, p. 65-75.
Physics
123
Auroral Zones, Diurnal Variations, Ionospheric Conductivity, Ionospheric Currents, Magnetic Storms, Hall Effect, Latitude, Magnetoactivity, Particle Precipitation
Scientific paper
Incoherent scatter observations of auroral zone ionospheric conductivity during a variety of magnetic conditions and seasons are presented that can aid in the modeling of the global patterns of electric field and current. Continuous observations of approximately 24 hr duration were obtained with the Chatanika incoherent scatter radar facility making continuous scans in the magnetic meridional plane on magnetically quiet and active winter days and under equinoctial conditions. Between 62 and 68 deg geomagnetic latitude, the solar contribution to the height-integrated conductivity is found to depend on the square root of the cosine of the solar zenith angle, and nighttime height-integrated Pedersen and Hall conductivities in the electron density trough are occasionally below the detection threshold of 0.5 mho. Precipitation during substorm conditions is observed to move southward and intensity, thus enhancing ionospheric conductivity, then move northward and diminish as the recovery phase begins. The southern boundary of the diffuse aurora in the midnight sector is observed to move equatorward with increasing magnetic activity. In addition, during a negative bay magnetic disturbance, Hall conductivity is found to be enhanced at southern latitudes where the Pedersen conductivity is not, while a decreasing precipitating particle hardness is indicated in association with the presence of a Harang discontinuity.
Matthews S. J.
Vickrey James F.
Vondrak Richard R.
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