Dynamics of Iogenic Material Draining Down The Jovian Magnetotail

Details Dynamics of Iogenic Material Draining Down The Jovian Magnetotail Dynamics of Iogenic Material Draining Down The Jovian Magnetotail

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.1508h&link_type=abstract

American Astronomical Society, DPS meeting #39, #15.08; Bulletin of the American Astronomical Society, Vol. 39, p.438

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Volcanic activity on Io is responsible for introducing neutral gas, ions, and electrons into Jupiter's magnetosphere, collecting initially in a torus engulfing Io's orbit. Some ions exit via charge exchange, but approximately a ton/s of the gas and plasma must leave the Jupiter system through some other means. The unique trajectory of the New Horizons spacecraft almost directly down the center of Jupiter's magnetotail allowed continuous energetic particle and plasma measurements to 2600 Jovian radii (RJ)---over 15 times further than any other spacecraft. Magnetopause crossings were still occurring when the Pluto Energetic Particle Spectrometer Science Investigation (PEPSSI) and the Solar Wind Around Pluto (SWAP) instruments were powered off in preparation for New Horizons’ first hibernation mode period while en route to Pluto. Material that drains down the magnetotail exhibits complex and varied phenomena, including 3 day quasi-periodicities in both ion intensity and plasma speed; 10 hour variations related to the planetary rotation rate both near the plasmasheet and as far as 1500 RJ down the tail; bursts of heavy ions originating 400 RJ and streaming down the tail to 2000 RJ variable composition; energetic electrons streaming down tail; and both sharp discontinuities and gradual transitions as the spacecraft passed through numerous distinct spatial structures. We report on these observations, which have dramatically expanded our knowledge of the dynamic Jovian magnetotail.

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