A detection of ionization ducts in the magnetosphere is planned in the EXOS-B satellite project.The duct dectection is based on the VLF Doppler method in which Doppler frequency shift of a ground based standard VLF signal is measured on the satellite. Since the Doppler shift is clearly different for ducted and non-ducted propagations, an existence of the duct can be easily detected. In case of the non-ducted propagation, the wave normal tends to direct within the resonance cone angle, where the electron temperature of the plasma is highly effective to the refractive index and therefore to the Doppler freguency shift. A feasibility of the deduction of the electron temperature from the observed Doppler shift is theoretically confirmed in this report.
EXOS-B搭載ダクトモニターと電子温度測定
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