The diffuse extreme-ultraviolet background - Constraints on hot coronal plasma

Details The diffuse extreme-ultraviolet background - Constraints on hot coronal plasma The diffuse extreme-ultraviolet background - Constraints on hot coronal plasma

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247...89p&link_type=abstract

Astrophysical Journal, Part 1, vol. 247, July 1, 1981, p. 89-96.

Computer Science

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25

Extreme Ultraviolet Radiation, High Temperature Plasmas, Interstellar Gas, Stellar Coronas, Temperature Distribution, X Ray Astronomy, Astronomical Models, Background Radiation, Gas Temperature, Isothermal Flow, Oxygen, Proportional Counters, Rocket Sounding, Solar Wind, Space Plasmas, Spectrum Analysis

Scientific paper

The Apollo-Soyuz data and data reported by Cash et al. (1976) have been reanalyzed in terms of both isothermal models and temperature distribution models. In the latter case, a power-law form is assumed for the relation between emission measure and temperature. A new upper limit on diffuse flux in the 20-73 eV band derived from Apollo-Soyuz observations made in the earth's shadow has been incorporated in the calculation. In the considered investigation the results of the new analysis are presented and the implications for the physical properties of the hot component of the interstellar medium are discussed. The analysis of the Berkeley extreme ultraviolet (EUV) diffuse background measurements using either isothermal or power law temperature distribution models for the emitting plasma indicates excellent qualitative agreement with hard X-ray data that suggest the sun to be immersed in a hot plasma that pervades most of space out to approximately 100 pc.

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