NDLI: Properties of nearby interstellar hydrogen deduced from lyman-alpha sky background measurements

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Properties of nearby interstellar hydrogen deduced from lyman-alpha sky background measurements

Content Provider	NASA Technical Reports Server (NTRS)
Author	Thomas, G. E.
Copyright Year	1972
Description	For a sufficiently rapid relative motion of the solar system and the nearby interstellar gas, neutral atoms may be expected to penetrate the heliosphere before becoming ionized. Recent satellite measurements of the Lyman alpha emission above the geocorona indicate such an interstellar wind of neutral hydrogen emerging from the direction of Sagittarius and reaching to within a few astronomical units of the sun. A detailed model of the scattering of solar Lyman alpha from the spatial distribution of neutral hydrogen in interplanetary space is presented. This asymmetric distribution is established by solar wind and solar ultraviolet ionization processes along the trajectories of the incoming hydrogen atoms. The values of the interstellar density, the relative velocity, and the gas temperature are adjusted to agree with the Lyman alpha measurements. The results may be interpreted in terms of two models, the cold model and the hot model of the interstellar gas, depending on whether galactic Lyman alpha emission is present at its maximum allowable value or negligibly small.
File Size	1530289
Page Count	16
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19730002086
Archival Resource Key	ark:/13960/t9382490d
Language	English
Publisher Date	1972-01-01
Access Restriction	Open
Subject Keyword	Space Sciences Lyman Spectra Lyman Alpha Radiation Polarized Electromagnetic Radiation Geocoronal Emissions Atomic Spectra Extraterrestrial Radiation Solar Wind Interstellar Gas Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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