New Horizons Plasma Observations of Jupiter's Magnetotail to >2500 RJ

Details New Horizons Plasma Observations of Jupiter's Magnetotail to >2500 RJ New Horizons Plasma Observations of Jupiter's Magnetotail to >2500 RJ

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm44a..01m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM44A-01

Physics

2756 Planetary Magnetospheres (5443, 5737, 6033), 2764 Plasma Sheet, 5443 Magnetospheres (2756)

Scientific paper

(*On behalf of the New Horizons Plasma Science Team.) Observations from the New Horizons spacecraft as it traversed down the jovian magnetotail to >2500 jovian radii (RJ) reveal a remarkable diversity of plasma populations and structures. At ~~100 RJ the ions evolved from a hot plasma disk distribution to slower flows down the tail that persisted and became increasingly variable in flux and mean energy. The plasma was highly structured with numerous sharp discontinuities, gradual boundaries, and apparent plasmoids, and contained a variable mixture of plasma from Io and Jupiter's ionosphere with intense bursts of ionospheric H+ and H3+. We observed 10 hour quasi-periodicities in flux far from the plasma disk at ~~450 RJ, and again at ~~1500 RJ, just inside the magnetopause and magnetopause boundary layer. We also found a 3-4 day quasi-periodicity in flow speed, most prominently from ~~600-1000 RJ, which may be indicative of large, expanding plasmoids moving down the tail. This talk summarizes the findings of McComas et al. [2007] and provides an update on the team's subsequent analysis efforts. McComas, D.J., F. Allegrini, F. Bagenal, F. Crary, R.W. Ebert, H. Elliott, A. Stern, and P. Valek, Diverse Plasma Populations and Structures in Jupiter's Magnetotail, Science, 2007.

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