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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 110,
A07218,
11 PP., 2005
doi:10.1029/2003JA010329
Evidence for the resonator of inertial Alfvén waves in the cusp topside ionosphere
Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Miyagi, Japan
Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Miyagi, Japan
Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Miyagi, Japan
Department of Geophysics, Graduate School of Science, Tohoku University, Sendai, Miyagi, Japan
National Institute of Information and Communications Technology, Nukui-kita, Koganei, Tokyo, Japan
National Institute of Information and Communications Technology, Nukui-kita, Koganei, Tokyo, Japan
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Yoshinodai, Sagamihara, Japan
Using Akebono satellite observations, we have examined the excitation mechanism of large-amplitude, electric and magnetic field variations in the vicinity of the cusp topside ionosphere. Three typical cusp events in the altitude range of ∼2000 km, ∼4000 km, and ∼7500 km are investigated in detail. The phase-frequency relationship obtained from a wavelet analysis is compared with the theoretical one given by the Lysak 1991 model for each event to find the evidence for the existence of ionospheric Alfvén resonator (IAR). Also, the ratios of electric field to magnetic field variations are compared with theoretical values of inertial Alfvén waves to identify the existence of inertial Alfvén waves. The obtained results demonstrate the clear signature of the coexistence of IAR and inertial Alfvén waves in extended altitude range of the cusp topside ionosphere.
Received 18 November 2003; accepted 18 August 2004; published 15 July 2005.
Citation: (2005), Evidence for the resonator of inertial Alfvén waves in the cusp topside ionosphere, J. Geophys. Res., 110, A07218, doi:10.1029/2003JA010329.
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