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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 14, issue 7
Ann. Geophys., 14, 699–706, 1996
https://doi.org/10.1007/s00585-996-0699-x
© European Geosciences Union 1996
Ann. Geophys., 14, 699–706, 1996
https://doi.org/10.1007/s00585-996-0699-x
© European Geosciences Union 1996

  31 Jul 1996

31 Jul 1996

Spatial features of mid-latitude field-line resonances from simultaneous ground-satellite measurements

K. Prikner K. Prikner

Abstract. Three series of simultaneous pulsation measurements ( f<0.06 Hz) on the Freja satellite and at the Budkov Observatory have been spectrally processed (FFT) in 6-min intervals of Freja's transits near the local Budkov field line. Doppler-shifted, weighted spectral-peak frequencies, determined in both transverse magnetic components in the mean field-aligned coordinate system on Freja, allowed the estimation, by comparison with the stable frequency at Budkov, of fundamental frequencies of the local magnetic-field-line resonance ranged from 13 to 17 mHz in two pulsation events analyzed, with Kp=2+ to 0+. The ratio of total amplitudes of the spectral-pulsation components on the ground and on Freja at an altitude of ~1700 km (values <0.7) characterizes the transmissivity of the ionosphere. In the Pc3 frequency range this correlates well with simulation computations using models of the ionosphere under low solar activity.

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