Title: Dynamic Magnetosphere-Ionosphere Coupling at Earth and Jupiter

Dr. Yi-Jiun Su
Physics Department, University of Texas at Arlington

Abstract. Although magnetic structures observed in our own solar system and in other celestial configurations are similar, each world exhibits distinctive and unique properties. The vastly differing magnetospheric dimensions are produced by differences in the intrinsic strengths of the associated magnetic fields and plasmas. A prime example of the difference is found in the comparison of magnetospheric plasma sources at Jupiter and Earth. While Io, Jupiter's most active satellite, serves as the main plasma source for Jupiter's magnetosphere, the source of the Earth's magnetospheric plasma is the solar wind and the ionosphere. Three types of magnetosphere-ionosphere (MI) coupling in the Earth’s auroral regions have been categorized: (1) upward current region, (2) downward current region, and (3) Alfvénic acceleration region. We suggest that all three types observed on the Earth may be active at Jupiter as well. The focus of the talk will be on the third region which is directly associated with the Jupiter-Io interaction. With our simulation efforts and observational evidence from the FAST satellite, we are able to explain the generation of short-burst auroral radiations through Alfvénic accelerated electrons. In addition, I will present the most recent results on the characteristics of the low-energy ions obtained by New Horizon/SWAP during the Jupiter’s magnetotail flyby.

UT Arlington Physics