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Date: 08/22 (Thu)
Time: 14:45-16:30
Place: Cosmo Studio
Speaker: "Shuntaro Yokota"

Title:
"Polarimetric observation of Jovian polar haze"

Abstract:
"Jupiter is the biggest gas planet in the solar system, and its atmosphere is mostly composed of hydrogen and helium. Jovian atmosphere contains small amounts of hydrocarbons and nitrogen compounds, and these fine particles called haze are found in the upper stratosphere at high latitudes. Previous observations suggest that the high-latitude haze layer forms a wave structure with the planetary Rossby wave activity, and haze motion explores atmospheric dynamics.
In order to obtain more information in the particle size and constituents, polarimetric observation from the ground-based telescope have performed and model calculations have conducted. However, these observations were limited the observation period and wavelength.
The first purpose in this study is to clarify the effect of haze activity on the degree of polarization and investigate the relationship between the haze activity and atmospheric motion in the stratosphere and troposphere. The Juno spacecraft is currently orbiting around Jupiter and presents us with detailed data on the polar region that has never existed. Using the Pirka telescope with abundant machine time, we can conduct observations in conjunction with the spacecraft.
In this study, I use LCTF as a linear polarizer and as a narrow-band filter. As a result of investigating how much depolarization the optical system shows, in the strong methane absorption band where the haze is well visible, it seemed significant depolarization. In this presentation, I will show the current state of observation, data analysis, and future observations."
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