Evidence for an Interstellar or Interplanetary Source of Diffuse he i 584 Å Radiation

Abstract

view Abstract Citations (27) References (7) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Evidence for an Interstellar or Interplanetary Source of Diffuse he i 584 Å Radiation Paresce, Francesco ; Bowyer, Stuart ; Kumar, Shailendra Abstract The intensity and spatial variations of the He 1 584 A radiation in the night sky were measured to an altitude of 264 km from a sounding rocket. The flux varied in intensity with look angle from a high of 16 i 5 rayleiglis to a low of <1 rayleigh. Since the peak flux levels observed are approximately two orders of magnitude larger than that expected from geocoronal resonant scattering, we have compared our results with those expected from two interplanetary sources of neutral helium: the penetration of the local interstellar medium into the solar neighborhood and the dust deionization of solar-wind alpha-particles. If currently tenable nominal input parameters for these sources are used, the data are much better fitted by the dust de-ionization source. However, both sources are compatible with the data to within the uncertalnities of the models. Subject headings:alrglow - interplanetary medium - interstellar matter - ultraviolet Publication: The Astrophysical Journal Pub Date: July 1973 DOI: 10.1086/181258 Bibcode: 1973ApJ...183L..87P full text sources ADS |