Siple 局から放射された左右両円偏波により励起されたホイスラーモード波の強度解析

概要

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According to the polarization experiment conducted using a Siple transmitter, the intensities of the signals transmitted with a right-hand circular polarization and received on the DE-1 satellite were about 10 dB greater than those transmitted with a left-hand circular polarization. In order theoretically to support these experimental results, the energy distributions of the whistler-mode waves in the lower ionosphere are calculated by using a full wave analysis when right- and left-hand circularly polarized waves are independently radiated by a crossed dipole antenna on the ground. Calculated results show that on the horizontal plane at an altitude of 105km the peak and total levels of the energy of the whistler-mode wave excited by the right-hand circular polarization are about 16dB and 8dB greater than those excited by the left-hand one, respectively. These calculated values are roughly consistent with the experimental result. It is also discussed that the entry point of the waves incident on the magnetosphere can be estimated from the knowledge of the observed value of the intensity ratio.
宇宙航空研究開発機構の論文