We present the results of a comparative study conducted in Antarctica using data from the SuperDARN radars and simultaneous geomagnetic field measurements at Terra Nova Bay (λ~80°S). Previous studies have shown that ULF waves in the Pc5 frequency band (2-7 mHz) observed at Terra Nova Bay when the station is close to the dayside cusp, and thus to closed field lines, can be interpreted in terms of signatures of field line resonances occurring at lower latitudes, in that ground-based magnetometers measure spatially integrated signals of the ionospheric currents with scale size less than ionospheric height. The radars, providing the Doppler velocities in the ionosphere at different geomagnetic latitudes, may allow to identify the resonances corresponding to the geomagnetic signals observed at Terra Nova Bay
A comparison of ULF waves observed at polar latitudes on the ground and at ionospheric heights
DE LAURETIS, Marcello;P. Francia;
2015-01-01
Abstract
We present the results of a comparative study conducted in Antarctica using data from the SuperDARN radars and simultaneous geomagnetic field measurements at Terra Nova Bay (λ~80°S). Previous studies have shown that ULF waves in the Pc5 frequency band (2-7 mHz) observed at Terra Nova Bay when the station is close to the dayside cusp, and thus to closed field lines, can be interpreted in terms of signatures of field line resonances occurring at lower latitudes, in that ground-based magnetometers measure spatially integrated signals of the ionospheric currents with scale size less than ionospheric height. The radars, providing the Doppler velocities in the ionosphere at different geomagnetic latitudes, may allow to identify the resonances corresponding to the geomagnetic signals observed at Terra Nova BayPubblicazioni consigliate
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