Department of Geophysics, Graduate School of Science, Tohoku University/Department of Geophysics, Graduate School of Science, Tohoku University/Department of Geophysics, Graduate School of Science, Tohoku University/Department of Geophysics, Graduate School of Science, Tohoku University
抄録(英)
The second harmonic wave properties of auroral kilometric radiation(AKR) were examined using data obtained by the Akebono satellite. The results of our statistical analysis indicate that the probability of a harmonic event occurrence is more than 60% of all AKR events. The relationship between the frequencies of the fundamentals and the second harmonics is exactly two times for the upper and lower cut-off frequencies of the spectra as well as the fine structures, within the resolution of the Akebono observations. The intensity ratio of the second harmonics to the fundamentals exhibits a two-fold nature, with both a linear and a quadratic relationship. Further data analyses also revealed that the second harmonic waves of AKR, which propagate in the X-mode, are generated from a source that is identical to that of the fundamental waves that propagate in the O-mode. These results suggest that the mechanism of AKR harmonic structure generation should allow the coexistence of different AKR emission processes.
Second harmonics of auroral kilometric radiation observed by the Akebono satellite
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KJ00000048008
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概要
