20-22 May 2015
Asia/Bangkok timezone
The Centennial Celebration of General Relativity Theory and 80 Years of Thai Physics Graduate

Influence of Magnetospheric Plasma on Aurora at Magnetic Footprints of Io

21 May 2015, 13:00
15m
White Lotus ()

White Lotus

Oral presentation Astronomy, Astrophysics, and Cosmology Astronomy, Astrophysics and Cosmology (Sponsored by NARIT)

Speaker

Ms Tatphicha Promfu (Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand)

Description

Io magnetic footprint (IFP) is a result of interaction between Jovain magnetosphere and Io. Due to Jupiter’s fast rotation in comparison with Io, magnetospheric plasmas collide with atmospheric particles of Io at high speeds. Therefore the interaction region expands into an extended area behind Io. As a result, aurora spot is extended into a tail-like structure. This research study factors that affect variability of interaction between Jupiter’s magnetosphere and Io, which causes the variation of magnetic footprint’s brightness for different positions of the Io in Jupiter’s magnetosphere. Io’s position is indicated by System III longitude. Observations of Io magnetic footprints in this study had been conducted via the Space Telescope Imaging Spectrograph (STIS) and Advanced Camera for Surveys (ACS) instruments along with the Hubble Space Telescope (HST). We compare the magnetic footprint’s brightness from observed data with fitted data since 1999 to 2007. This study found that the brightness is controlled by several factors such as the variation of plasma density in the vicinity of Io, the magnetic field asymmetry, including the duration of volcanic eruption on Io.

Primary author

Ms Tatphicha Promfu (Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand)

Co-authors

Prof. John Clarke (Center for Space Physics, Boston University, Boston, MA 02215, USA) Dr Jonathan Nichols (Department of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK) Dr Suwicha Wannawichian (Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand) Dr Utane Sawangwit (National Astronomical Research Institute of Thailand, Chiang Mai 50200, Thailand)

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