[PPS05-P11] Status of lightning hunt in Venus with Akatsuki/LAC and Pirka telescope
Keywords:lightning, Venus, Akatsuki, Pirka telescope
The triggering parameter was set so as to optimize for the light curve similar to the normal lightning in the Earth and data obtained totally for about 4 hours were examined. However, we couldn’t find any lightning signals. Adding to this triggering parameter set, we added one more parameter set, optimized for sprite type emission with duration of up to 10s of ms. Furthermore, in order to investigate fainter emissions, we are now conducting successive force triggering recordings without any threshold, achieving 5 times better sensitivity than the intensity of 1 digital unit at best.
The total coverage of the LAC lightning hunt became 81.6 [million km2-hr], meaning 81 percent detectability of previous results with ground-based telescope by Hansell et al. (1995). Here we report the detailed strategy and the latest status of the LAC observation in 2018, and discuss the future observation plan.
Also we will make ground observation with a high-speed photometer installed at Pirka telescope, a 1.6-m reflector deployed by Hokkaido University. Here we report the initial results of lightning flash observation with it.