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  • 1
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    Deflection of the interstellar neutral hydrogen flow across the heliospheric interface (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-03-05
    Description: Using an absorption cell, we measured the Doppler shifts of the interstellar hydrogen resonance glow to show the direction of the neutral hydrogen flow as it enters the inner heliosphere. The neutral hydrogen flow is found to be deflected relative to the helium flow by about 4 degrees . The most likely explanation of this deflection is a distortion of the heliosphere under the action of an ambient interstellar magnetic field. In this case, the helium flow vector and the hydrogen flow vector constrain the direction of the magnetic field and act as an interstellar magnetic compass.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lallement, R -- Quemerais, E -- Bertaux, J L -- Ferron, S -- Koutroumpa, D -- Pellinen, R -- New York, N.Y. -- Science. 2005 Mar 4;307(5714):1447-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Service d'Aeronomie du Centre National de la Recherche Scientifique, Institut Pierre Simon Laplace, Boite Postale 3, 91371 Verrieres-le-Buisson, France. rosine.lallement@aerov.jussieu.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15746421" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Deceleration of interstellar hydrogen at the heliospheric interface (1993)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1993-05-21
    Description: High-resolution spectra of nearby stars show absorption lines due to material in the local interstellar cloud. This cloud is deduced to be moving at 26 kilometers per second with respect to the sun, and in the same direction as the "interstellar wind" flowing through the solar system. Measurements by the Ulysses spacecraft show that neutral helium is drifting through the solar system at the same velocity, but neutral hydrogen appears to be moving at only 20 kilometers per second, a result confirmed by new measurements of the hydrogen emission line taken by the High-Resolution Spectrograph on the Hubble Space Telescope. These results indicate that neutral hydrogen atoms from the local interstellar cloud are preferentially decelerated at the heliospheric interface, most likely by charge-exchange with interstellar protons, while neutral helium is unaffected by the plasma. The magnitude of the observed deceleration implies an interstellar plasma density of 0.06 to 0.10 per cubic centimeter, which in turn implies that the heliospheric shock should be less than 100 astronomical units from the sun.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lallement, R -- Bertaux, J L -- Clarke, J T -- New York, N.Y. -- Science. 1993 May 21;260(5111):1095-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17806336" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Voyager measurements of hydrogen Lyman-alpha diffuse emission from the Milky Way (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-12-07
    Description: Doppler-shifted hydrogen Lyman-alpha (Lyalpha) emission from galaxies is currently measured and used in cosmology as an indicator of star formation. Until now, the Milky Way emission has not been detected, owing to far brighter local sources, including the H (hydrogen) glow, i.e., solar Lyalpha radiation backscattered by interstellar atoms that flow within the solar system. Because observations from the Voyager spacecraft, now leaving the heliosphere, are decreasingly affected by the H glow, the ultraviolet spectrographs are detecting Lyalpha diffuse emission from our Galaxy. The surface brightness toward nearby star-forming regions is about 3 to 4 rayleighs. The escape fraction of the radiation from the brightest H II regions is on the order of 3% and is highly spatially variable. These results will help in constraining models of Lyalpha radiation transfer in distant galaxies.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lallement, Rosine -- Quemerais, Eric -- Bertaux, Jean-Loup -- Sandel, Bill R -- Izmodenov, Vlad -- New York, N.Y. -- Science. 2011 Dec 23;334(6063):1665-9. doi: 10.1126/science.1197340. Epub 2011 Dec 1.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Galaxies, Etoiles, Physique, Instrumentation (GEPI), Observatoire de Paris, CNRS, Universite Paris Diderot, Place Jules Janssen, Meudon, France. rosine.lallement@obspm.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22144462" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
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