Assessments of Magnetic Reconnection and Kelvin-Helmholtz Instability at Ganymede's Upstream Magnetopause

• DOI: 10.5194/egusphere-egu2020-2746
• Publication Date: 2020-03-09T14:34:22Z
• Authors: Nawapat Kaweeyanun; Adam Masters; Xianzhe Jia
• Keywords: Jupiter (rocket family); Magnetosheath

<p>Ganymede is the largest moon of Jupiter and only Solar System known to generate a permanent magnetic field. Motions Jupiter’s magnetospheric plasma around Ganymede create an upstream magnetopause, where energy flows are thought be driven by reconnection and/or Kelvin-Helmholtz Instability (KHI). Previous numerical simulations indicate evidence for transient events KHI wave structures, but natures both processes remain poorly understood. Here we present analytical model steady-state conditions at Ganymede’s from which conduct first assessments onset criteria boundary. We find that may occur wherever closed field encounters ambient field, regardless variations in magnetopause conditions. Unrestricted highlights possibilities multiple X-lines or widespread Ganymede. The rate controlled Jovian orientation hence rotation. also determine favorable growths two confined regions each along flank, grow area whenever moves toward current sheet. growth rates calculated with Finite Larmor Radius (FLR) effects incorporated found asymmetric favoring flank closest Jupiter. significance on remains investigated. Future progress topics highly relevant upcoming JUpiter ICy Explorer (JUICE) mission.</p>