Mathematics – Logic
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2345....3b&link_type=abstract
In NASA. Goddard Space Flight Center Local Interstellar Medium, No. 81 p 3-23 (SEE N85-15539 06-90)
Mathematics
Logic
30
Interstellar Space, Solar Terrestrial Interactions, Solar Wind, Sun, Backscattering, Concentration (Composition), Helium, Hydrogen, Line Spectra, Temperature Measurement, Velocity Distribution
Scientific paper
From the intensity distribution of the glow in the solar system, one can derive the density of H and He in the local interstellar medium (LISM) and the direction of the relative motion V→w between the sun and the LISM in the very vicinity of the sun. A summary of results is presented, together with a discussion of the methods of interpretation and their difficulties. The vector V→w is found to be 20±1 km s-1 in the direction α = 254±3°, δ = -17±3°, quite different from the Apex direction. This means that the LISM is moving also in respect to the local frame of reference giving rise to the so-called Interstellar Wind. The temperature of the LISM is T = 8,000±1,000K, the density n(H) ≅ 0.04 to 0.06 cm-3, and the helium density n(He) ≅ 0.015 to 0.020. The high helium/hydrogen ratio, in respect to the cosmological ratio, would imply that a substantial part of the hydrogen is ionized.
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