LOCAL INTERSTELLAR NEUTRAL HYDROGEN SAMPLED IN SITU BY IBEX
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Saul-2012-LOCAL INTERSTELLAR N.pdf
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Author(s)
Saul, Lukas
Wurz, Peter
Rodriguez, Diego
Schwadron, Nathan
Kucharek, Harald
Leonard, Trevor
Bzowski, M.
Fuselier, S. A.
McComas, David J.
Crew, Geoffrey B.
Date Issued
January 2012
Journal
The Astrophysical Journal. Supplement Series
Publisher
IOP Publishing
Citation
Saul, Lukas, Peter Wurz, Diego Rodriguez, Jurgen Scheer, Eberhard Mobius, Nathan Schwadron, Harald Kucharek, et al. “LOCAL INTERSTELLAR NEUTRAL HYDROGEN SAMPLED IN SITU BY IBEX.” The Astrophysical Journal Supplement Series 198, no. 2 (January 31, 2012): 14. © 2012 The American Astronomical Society
Version
Final published version
Abstract
Hydrogen gas is the dominant component of the local interstellar medium. However, owing to ionization and interaction with the heliosphere, direct sampling of neutral hydrogen in the inner heliosphere is more difficult than sampling the local interstellar neutral helium, which penetrates deep into the heliosphere. In this paper, we report on the first detailed analysis of the direct sampling of neutral hydrogen from the local interstellar medium. We confirm that the arrival direction of hydrogen is offset from that of the local helium component. We further report the discovery of a variation of the penetrating hydrogen over the first two years of Interstellar Boundary Explorer observations. Observations are consistent with hydrogen experiencing an effective ratio of outward solar radiation pressure to inward gravitational force greater than unity (μ > 1); the temporal change observed in the local interstellar hydrogen flux can be explained with solar variability.
MIT Department
Haystack Observatory
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DOI of Published Version
https://doi.org/10.1088/0067-0049/198/2/14
