Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....97..394c&link_type=abstract
Astronomy and Astrophysics, vol. 97, no. 2, Apr. 1981, p. 394-397.
Astronomy and Astrophysics
Astrophysics
18
Background Radiation, Far Ultraviolet Radiation, Lyman Alpha Radiation, Solar Activity Effects, Solar Flux, Anisotropy, Backscattering, Interstellar Matter, Sunspots
Scientific paper
An estimate is given for the anisotropy of the solar full disk flux in the far ultraviolet, as it would be observed for lines of sight within and above the ecliptic plane through the predominant influence of plages at low heliocentric latitudes. The flux anisotropy for Lyman alpha, at a level of solar activity with a sunspot number of roughly 160, is approximately 0.88 for the integrated flux over the Lyman alpha profile and 0.83 for the flux at line center. The effect of this Lyman alpha flux anisotropy on the Lyman alpha sky background intensity, resonantly backscattered from the local interstellar medium that is streaming through the solar system, is examined. It is concluded that the solar Lyman alpha anisotropy should be included in models of the interplanetary background during periods of moderate to high solar activity.
Brueckner Guenter E.
Cook William J.
Meier Robert R.
van Hoosier M. E.
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