The abundance of atomic 1 H, 4 He and 3 He in the local interstellar cloud from pickup ion observations with SWICS on Ulysses
dc.contributor.author | Gloeckler, George | en_US |
dc.date.accessioned | 2006-09-11T13:49:41Z | |
dc.date.available | 2006-09-11T13:49:41Z | |
dc.date.issued | 1996-10 | en_US |
dc.identifier.citation | Gloeckler, George; (1996). "The abundance of atomic 1 H, 4 He and 3 He in the local interstellar cloud from pickup ion observations with SWICS on Ulysses." Space Science Reviews 78 (1-2): 335-346. <http://hdl.handle.net/2027.42/43780> | en_US |
dc.identifier.issn | 0038-6308 | en_US |
dc.identifier.issn | 1572-9672 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/43780 | |
dc.description.abstract | Pickup ions measured deep inside the heliosphere open a new way to determine the absolute atomic density of a number of elements and isotopes in the local interstellar cloud (LIC). We derive the atomic abundance of hydrogen and the two isotopes of helium from the velocity and spatial distributions of interstellar pickup protons and ionized helium measured with the Solar Wind Ion Composition Spectrometer (SWICS) on the Ulysses spacecraft between ∼2 and ∼5 AU. The atomic hydrogen density near the termination shock derived from interstellar pickup ion measurements is 0.115±0.025 cm −3 and the atomic H/He ratio from these observations is found to be 7.7 ± 1.3 in the outer heliosphere. Comparing this value with the standard universal H/He ratio of ∼10 we conclude that filtration of hydrogen is small and that the ionization fraction of hydrogen in the LIC is low. | en_US |
dc.format.extent | 826952 bytes | |
dc.format.extent | 3115 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.language.iso | en_US | |
dc.publisher | Kluwer Academic Publishers; Springer Science+Business Media | en_US |
dc.subject.other | Physics | en_US |
dc.subject.other | Astronomy | en_US |
dc.title | The abundance of atomic 1 H, 4 He and 3 He in the local interstellar cloud from pickup ion observations with SWICS on Ulysses | en_US |
dc.type | Article | en_US |
dc.subject.hlbsecondlevel | Aerospace Engineering | en_US |
dc.subject.hlbsecondlevel | Atmospheric, Oceanic and Space Sciences | en_US |
dc.subject.hlbtoplevel | Engineering | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Department of Physics and IPST, University of Maryland, 20742, College Park, MD, USA; Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, 48109, Ann Arbor, MI, USA | en_US |
dc.contributor.affiliationumcampus | Ann Arbor | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/43780/1/11214_2004_Article_BF00170820.pdf | en_US |
dc.identifier.doi | http://dx.doi.org/10.1007/BF00170820 | en_US |
dc.identifier.source | Space Science Reviews | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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