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3rd LOIS Workshop, November 24-25, 2002 Växjö University, Växjö, Sweden |
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Using LOFAR-LOIS for high-resolution radio
and radar studies of the effects of powerful
HF pumping into the nightside auroral ionosphere
on the substorm development
Nataly F. Blagoveshchenskaya
nata@aari.nw.ru
Arctic and Antarctic Research Institute
St. Peterburg, Russia
and radar studies of the effects of powerful
HF pumping into the nightside auroral ionosphere
on the substorm development
Nataly F. Blagoveshchenskaya
nata@aari.nw.ru
Arctic and Antarctic Research Institute
St. Peterburg, Russia
AbstractRecent experiments with the EISCAT HF Heating facility, located near Tromsø, Norway, have indicated that HF pumping into the nightside auroral ionosphere along the magnetic field-aligned direction produces a modification of the magnetosphere-ionosphere coupling which, in turn, under certain geophysical conditions may cause triggering of auroral activation. Distinctive features related to auroral activation in course of the Tromsø HF pumping experiments were identified in multi-instrument ground-based observations. These features include:
A possible scheme for the substorm triggering due to the excitation of the turbulent Alfvén boundary layer in the ionospheric Alfvén resonator is considered. Still, many questions are outstanding:
The presentation (PDF) |
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