urn:jaxa:darts:context:instrument:vco.lac 1.0 1.18.0.0 Product_Context lac LAC 2022-11-10 1.0 Initial version. urn:jaxa:darts:context:instrument_host:spacecraft.vco instrument_to_instrument_host 10.1007/s11214-008-9400-x Takahashi, Y., J. Yoshida, Y. Yair, T. Imamura, M. Nakamura, Lightning detection by LAC onboard the Japanese Venus climate orbiter, Planet-C, Space Sci. Rev., 137, 317-334, 2008. The LAC instrument paper. Lightning and Airglow Camera Camera Imager -5400 Lightning and Airglow Camera (LAC) searches for lightning flashes and maps airglow emissions on the nightside disk of Venus when Akatsuki is located in the eclipse (umbra) of Venus. A major goal of the lightning observation is to settle the controversy on the occurrence of lightning in the Venusian atmosphere. The distribution of lightning, if it exists, should reflect the microphysics of clouds and the dynamics of mesoscale convection. The 777.4 nm [OI] line of atomic oxygen is utilized for lightning observation, as this line is considered the strongest emission from lightning discharges according to a laboratory experiment simulating the Venusian atmosphere. Possible lightning flashes were detected on the nightside disk of Venus at this wavelength by using a ground-based telescope. LAC also measures emissions in two airglow bands to study the global-scale circulation and small-scale waves in the lower thermosphere. One is the O2 Herzberg II emission centered at 552.5 nm wavelength, which is considered a consequence of the recombination of atomic oxygen in downwelling and is the strongest emission among the visible Venusian airglows. The other is the 557.7 nm [OI] emission; though Venera 9 and 10 failed to detect this emission it was observed using a ground-based telescope.