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Date: 12/12 (Thu)
Time: 14:45-16:30
Place: 8-1-03
Speaker: Tatsuharu Ono
Title:
Ground-based observation of planetary lightning - Jupiter & Venus -

Abstract:
Some planets have characteristic atmosphere dynamics in our solar system. One of the Jovian features is a stripe. The stripe is called a band structure. The band structure consists of the east-west zonal jet.�@There is one theory that the zonal jet is formed by coupling small-scale eddies generated by vertical convection generating cumulonimbus [Gierasch et al., 2000; Ingersoll et al., 2000]. In Venus, the wind velocity is too faster than the venus�f rotation period. We call it �gSuper Rotation�h. The vertical convection transfer the angular momentum. The angular momentum transferring is important in one of the theories of Super Rotation. It is important to understand the vertical convection to reveal the atmosphere dynamics. It is difficult to observe the vertical convection because there is no trail-able target and hidden that vertical convection by a dense atmosphere. However, Lightning observation helps us to obtain information about the vertical convection. From the previous study, we already have known that there is lightning in Jupiter and Saturn. The lightning is not a phenomenon that occurs only on Earth. If the mechanism of lightning is similar to the Earth�fs, the lightning existence has a relationship with vertical convection.

My purpose is to obtain an advanced understanding of the atmosphere dynamics by revealing the Lightning�fs distribution and time variation. For this purpose, I develop the instruments which can observe the Lightning by using a ground-based telescope. The ground-based telescope can observe Jupiter over a few months. By this instrument, I compare the wind velocity change and lightning distribution to reveal those relationships. In this seminar, I would like to talk about the observation result of Jupiter by the developed instrument in the first half. In the second half, I talk about the future work for observation of Venus. 
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