Mathematics – Probability
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh22c..03m&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SH22C-03
Mathematics
Probability
2114 Energetic Particles, Heliospheric (7514), 2124 Heliopause And Solar Wind Termination, 2134 Interplanetary Magnetic Fields, 2144 Interstellar Gas, 2152 Pickup Ions
Scientific paper
This study analyzes the first observations of heliospheric pickup ions beyond the orbit of Jupiter. The Cassini Plasma Spectrometer observes H+, He+, He++, and O+ pickup ions of interstellar origin between 6.4 and 8.2 AU. Surprisingly, however, there is a strong depletion of pickup H+ compared to He+, in contrast to the interstellar H/He ratio of approximately 10. We show that this depletion is produced by a combination of gravitational focusing of He by the Sun and a newly observed "interstellar hydrogen shadow" that diminishes the source of pickup H as Cassini moves through the region behind the Sun relative to the local interstellar flow. Most H atoms cannot penetrate into this downstream shadow region since to get there they must pass close by the Sun where they have a high probability of being ionized and swept out with the solar wind.
Berthelier Jean-Jacques
Coates Andrew J.
Crary Frank J.
Elliott Heather Alison
Gosling Jack T.
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