期刊
ASTRONOMY & ASTROPHYSICS
卷 491, 期 1, 页码 7-19出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20078810
关键词
interplanetary medium; Sun: solar wind; ISM: clouds; ISM: atoms; Sun: UV radiation
资金
- International Space Science Institute (Bern, Switzerland) Working Group Neutral Interstellar Hydrogen
- NASA UARS
- TIMED
- SOHO missions
- GSFC/SPDF OMNIWeb
- Polish MSRiT [1P03D00927, N 522 022 31/0902]
- RFBR [07-02-01101-a, 07-01-00291-a]
- Dynastia Foundation
- NASA [NNG06GD55G, NAG 5-12929]
- California Institute of Technology
Aims. By reevaluating a 13-month stretch of Ulysses SWICS H pickup ion measurements near 5 AU close to the ecliptic right after the previous solar minimum, this paper presents a determination of the neutral interstellar H density at the solar wind termination shock and implications for the density and ionization degree of hydrogen in the local interstellar cloud. Methods. The density of neutral interstellar hydrogen at the termination shock was determined from the local pickup ion production rate as obtained close to the cut-off in the distribution function at aphelion of Ulysses. As shown in an analytical treatment for the upwind axis and through kinetic modeling of the pickup ion production rate at the observer location, with variations in the ionization rate, radiation pressure, and the modeling of the particle behavior, this analysis turns out to be very robust against uncertainties in these parameters and the modeling. Results. Analysis using current heliospheric parameters yields the H density at the termination shock equal to 0.087 +/- 0.022 cm(-3), including observational and modeling uncertainties.
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