Origin of the O(+) pick-up ions in the hehiosphere

Details Origin of the O(+) pick-up ions in the hehiosphere Origin of the O(+) pick-up ions in the hehiosphere

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...289..933g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 289, no. 3, p. 933-936

Astronomy and Astrophysics

Astrophysics

13

Heliosphere, Interplanetary Medium, Interstellar Gas, Io, Ion Sources, Oxygen Ions, Abundance, Ion Density (Concentration), Neutral Particles, Solar Wind, Velocity Distribution

Scientific paper

The main sources for the ions in the interplanetary medium are the solar wind and the interstellar gas intruding into the heliosphere. Other sources, i.e. comets and planets can, however, contribute significantly locally. We present approximate expressions for deriving fluxes of pick-up ions originating from local neutral gas sources. Since the Io-torus is thought to be a relatively strong emitter of fast atoms, particular O and S, we used the O(+) data obtained by SWICS-Ulysses as a function of distance from Jupiter, both in and out-off the ecliptic plane in order to recognize a possible contribution of the Ionian source to the measured O(+). We find that - except for a very limited zone near the Jovian magnetosphere - the contribution of the Io-torus to the O(+) fluxes is minor, thus confirming our previous results on the pick-up H(+), He(+), N(+), O(+), and Ne(+) fluxes of interstellar origin.

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