Double structure of ionospheric conductivity in the midnight auroral oval during a substorm |
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| Institution: | 1. Arctic and Antarctic Research Institute, St.-Petersburg, Russia;2. Polar Geophysical Institute, Apatyi, Russia;1. Space Physics Laboratory, Vikram Sarabhai Space Center, Trivandrum 695022, India;2. Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, SK S7N 5E2, Canada;1. Mbarara University of Science and Technology, Department of Physics, Mbarara P. O. Box 1410, Uganda;2. Muni University, Department of Physics, Arua P.O. Box 725, Uganda;3. Swedish Institute of Space Physics, Uppsala, Sweden;4. South African National Space Agency, Hospital Street, Hermanus P. O. Box 32, South Africa;5. Rhodes University Makhanda, Department of Physics and Electronics, 6139, Eastern Cape, P. O. Box 6140, South Africa |
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| Abstract: | Measurements of precipitating particles on board DMSP F7 spacecraft are used to analyze the distribution of ionospheric conductance in the midnight auroral zone during substorms. The distribution is compared with the meridional profile of ionospheric currents calculated from magnetic data from the Kara meridional chain. Two regions of high Hall conductance are found; one of them is the traditional auroral zone, at latitudes 64–68°, and the other is a narrow band at latitudes 70–73°. The position of high conductance zones is in agreement with the location of the intense westward currents. The accelerated particle population is typical of electrons Ee > 5 keV in the high conductance region. |
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