Ionospheric Alfvén resonator as seen by Freja satellite

Details Ionospheric Alfvén resonator as seen by Freja satellite Ionospheric Alfvén resonator as seen by Freja satellite

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27..923g&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 7, p. 923-926

Physics

19

Magnetospheric Physics: Magnetosphere-Inner, Magnetospheric Physics: Mhd Waves And Instabilities

Scientific paper

Sharp increase of the Alfvén speed above the ionosphere is expected to create a resonant cavity for the Alfvén waves traveling along the geomagnetic field lines (so-called Ionospheric Alfvén Resonator). The wavelet transform has been used to analyze magnetic and electric fields recorded on Freja satellite. Cross-phase spectra between field components in the frequency range 0.5-10 Hz reveal a pattern similar to that predicted theoretically for the resonator. The Fourier cross-phase spectra fail to show any characteristic features. We conclude that this is due to the spatial structure of the resonator which can be examined only with local analysis techniques.

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