lo’s Magnetic Footprint Emission:
an Indicator of Electromagnetic Interaction
between the Satellite and Jupiter’s Magnetosphere
Suwicha Wannawichian *,John Clarke , Frances Bagenal
And Jonathan Nichols
Chiangmai University,Thailand
Bostos University,United States
University of Colorado,United States
University of Leicester,U.K.
Email:suwichawan@gmail.com
Abstract
The auroral mangnetic footprain, an emission spot near the main auroral oval,is the indicator
of interaction between magnetospheric plasma of parent planet and its satellite. In this study the interaction between Jupiter’s magnetosphere and lo will be studied via the brightness
variation of lo’s magnetic footprint footprints. The far-ultraviolet (FUV) images of
lo’s magnetic footprints were taken by the Hubble Space Telescope’s(HST)
two instruments,the Space Telescope lmaging Spectrograph(STIS)and the Advanced Camera for Surveys(ACS).The footprint brightness was found to vary with the locations of the the satellite in jupiter’s magnetosphere.According to prior observation and modeling,the plasma density in the vicinity of lo also varies in correlation with the footprint brightness.For further investigation,direct observation of lo’s sodium cloud were compared with the satellite’s
magnetic footprint brightness variations.Based on a least square fit, the modelgenrated power has an acceptable correlation(R>75%)with lo’s magnetic footprint brightness.This large data set shows the strong relation between lo’s magnetic footprint brightness and the satellte’s plasma environment, indicating the strength of electromagnetic interaction interaction in the vicinity of lo.