S10 探査機搭載高速フォトメータによる金星雷放電観測(金星探査特別セッション)

概要

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The existence of lightning in Venus is still controversial. Some observations strongly indicate the evidence of optical flash or electromagnetic pulse induced by lightning discharges while other observations show no clear signs of lightning. Radio wave measurements are sometimes contaminated by pulses generated around the satellite or by natural plasma waves due to some instabilities in space plasma. Optical measurements by Pioneer Venus Orbiter could not find out the flash. However, this results cannot to be conclusive since the analysis were carried out using just the star-tracker data, and the observation period is only 〜80 sec. We propose the hi-speed photometer as an onboard instrument of Venus spacecraft mission which can detect very weak lightning flash under the clouds.
2001-10-06