Venus Lightning and Airglow Observations by the Japanese Venus Climate Orbiter Planet-C

Details Venus Lightning and Airglow Observations by the Japanese Venus Climate Orbiter Planet-C Venus Lightning and Airglow Observations by the Japanese Venus Climate Orbiter Planet-C

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.4505y&link_type=abstract

American Astronomical Society, DPS meeting #38, #45.05; Bulletin of the American Astronomical Society, Vol. 38, p.568

Physics

Scientific paper

We are developing a lightning and airglow camera (LAC) onboard the Japanese Venus Climate Orbiter (VCO). LAC is a high-speed imaging sensor and measures lightning flashes and airglow emissions on the nightside disk of Venus when VCO is located within the umbra of Venus. One of the major goals of LAC is to settle controversy on existence of lightning in Venus. Lightning observations will give us information for the charging mechanism, charge separation mechanism, physics of sulfuric acid clouds, mesoscale planetary meteorology and impacts on atmospheric chemical processes. The 777.4 nm band associated with the excitation of neutral oxygen is expected to be a strong emission from the laboratory discharge experiment in the simulated atmosphere of Venus. Also possible lightning flashes in the nightside disk of Venus at this wavelength were detected by a ground-based telescope. We will also obtain information on the global circulation in the Venus lower thermosphere by continuous observation of large-scale structure of Venusian night airglow of O2 Herzberg II (552.5 nm). The Herzberg II bands of molecular oxygen are the strongest emission in the visible region of Venusian airglow and its intensity of 551 to 552 nm region, rotational lines from this 0-10 band, is 270 R (Slanger et al., 2001). LAC also enables us to measure wave-like structures produced by gravity waves which play an important role in a dynamical coupling between the lower and upper atmosphere. Furthermore, we will measure the 557.7 nm [OI] and 630.0 nm [OI] emissions. Both atomic oxygen line emissions are not detected by Venera 9/10, but recently, green line emission is discovered using ground based telescope and its intensity is 167 R, while red line emission is not detected. We'll show the strategy and observation plans of LAC.

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