Akebono satellite observations of Dispersive Alfven waves and the ionospheric Alfven resonator in the cusp region

Details Akebono satellite observations of Dispersive Alfven waves and the ionospheric Alfven resonator in the cusp region Akebono satellite observations of Dispersive Alfven waves and the ionospheric Alfven resonator in the cusp region

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm12a0497h&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM12A-0497

Physics

2149 Mhd Waves And Turbulence, 2431 Ionosphere/Magnetosphere Interactions (2736), 2708 Current Systems (2409), 2712 Electric Fields (2411)

Scientific paper

In the cusp region at altitudes of a few thousands of km, burst-like fluctuations of electric and magnetic fields are often observed in the ULF range of 0.2-5 Hz on the Akebono satellite. We have found that these bursts occasionally have clear harmonic structures in small-scale upward field-aligned current regions. The Alfven resonator between the bottom of the Auroral acceleration region and the ionospheric E layer is one of the candidates of these harmonic structures. The model of Lysak et al. [1991] calculated the phase shifts of electric and magnetic field as a function of frequency using the ionospheric Alfven resonator model. Grzesiak. [2001] succeeded in demonstrating that satellite measurements coincide with the model given by Lysak. Pilipenko et al. [2001] investigated the resonance condition of dispersive Alfven wave between the bottom of the auroral acceleration and the E layer. Based on these previous results, we compared electric and magnetic field data obtained by the Akebono satellite with the Lysak model, using the cross-wavelet analysis method. Further, considering that small-scale upward and downward field-aligned currents would be produced by dispersive Alfven waves, we compared the measured ratios of electric and magnetic field with the resonance condition of dispersive Alfven waves.

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