LOCAL INTERSTELLAR NEUTRAL HYDROGEN SAMPLED IN SITU BY IBEX
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 t...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
| Published: |
IOP Publishing
2015
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| Online Access: | http://hdl.handle.net/1721.1/95442 |
| _version_ | 1826207289882705920 |
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| author | Saul, Lukas Wurz, Peter Rodriguez, Diego Schwadron, Nathan Kucharek, Harald Leonard, Trevor Bzowski, M. Fuselier, S. A. McComas, David J. Crew, Geoffrey B. Scheer, Jurgen Mobius, Eberhard |
| author2 | Haystack Observatory |
| author_facet | Haystack Observatory Saul, Lukas Wurz, Peter Rodriguez, Diego Schwadron, Nathan Kucharek, Harald Leonard, Trevor Bzowski, M. Fuselier, S. A. McComas, David J. Crew, Geoffrey B. Scheer, Jurgen Mobius, Eberhard |
| author_sort | Saul, Lukas |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T13:47:01Z |
| format | Article |
| id | mit-1721.1/95442 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:47:01Z |
| publishDate | 2015 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/954422022-10-01T17:05:52Z LOCAL INTERSTELLAR NEUTRAL HYDROGEN SAMPLED IN SITU BY IBEX Saul, Lukas Wurz, Peter Rodriguez, Diego Schwadron, Nathan Kucharek, Harald Leonard, Trevor Bzowski, M. Fuselier, S. A. McComas, David J. Crew, Geoffrey B. Scheer, Jurgen Mobius, Eberhard Haystack Observatory Crew, Geoffrey B. 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. Swiss National Science Foundation (Grant NS-1260-11-09) Polish Ministry for Science and Higher Education (Grant N-N203-513-038) 2015-02-20T16:08:38Z 2015-02-20T16:08:38Z 2012-01 2011-07 Article http://purl.org/eprint/type/JournalArticle 0067-0049 1538-4365 http://hdl.handle.net/1721.1/95442 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 en_US http://dx.doi.org/10.1088/0067-0049/198/2/14 The Astrophysical Journal. Supplement Series Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf IOP Publishing American Astronomical Society |
| spellingShingle | Saul, Lukas Wurz, Peter Rodriguez, Diego Schwadron, Nathan Kucharek, Harald Leonard, Trevor Bzowski, M. Fuselier, S. A. McComas, David J. Crew, Geoffrey B. Scheer, Jurgen Mobius, Eberhard LOCAL INTERSTELLAR NEUTRAL HYDROGEN SAMPLED IN SITU BY IBEX |
| title | LOCAL INTERSTELLAR NEUTRAL HYDROGEN SAMPLED IN SITU BY IBEX |
| title_full | LOCAL INTERSTELLAR NEUTRAL HYDROGEN SAMPLED IN SITU BY IBEX |
| title_fullStr | LOCAL INTERSTELLAR NEUTRAL HYDROGEN SAMPLED IN SITU BY IBEX |
| title_full_unstemmed | LOCAL INTERSTELLAR NEUTRAL HYDROGEN SAMPLED IN SITU BY IBEX |
| title_short | LOCAL INTERSTELLAR NEUTRAL HYDROGEN SAMPLED IN SITU BY IBEX |
| title_sort | local interstellar neutral hydrogen sampled in situ by ibex |
| url | http://hdl.handle.net/1721.1/95442 |
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