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THE ASTROPHYSICAL JOURNAL, 522:904914, 1999 September 10 1999. The American Astronomical Society. All rights reserved. Printed in U.S.A.(
 

Summary: THE ASTROPHYSICAL JOURNAL, 522:904»914, 1999 September 10
1999. The American Astronomical Society. All rights reserved. Printed in U.S.A.(
AN ANALYSIS OF 17 YEARS OF V OY AGER OBSERVATIONS OF THE DIFFUSE FAR-ULTRAVIOLET
RADIATION FIELD
JAYANT MURTHY, DOYLE HALL, MATTHEW EARL,1 AND R. C. HENRY
Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218-2686
AND
J. B. HOLBERG
Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721
Received 1997 April 21; accepted 1999 February 10
ABSTRACT
We have systematically reduced 17 years of data from the V oyager ultraviolet spectrometer (UVS)
archives, from which we have obtained 431 spectra that place useful limits on the diuse far-ultraviolet
radiation –eld between 912 and 1100 We observe a large range in brightnesses ranging from upperA .
limits of 30 photons cm~2 s~1 sr~1 The diuse background is correlated with the integrated T D-1A ~1.
—ux near the line of sight but shows no correlation with N(H I). We place a 1 p upper limit of 30
photons cm~2 s~1 sr~1 on the level of an isotropic extragalactic continuum.A ~1
We have modeled and characterized the observed heliospheric H I and He I emission lines in the outer
solar system as a function of heliospheric distance, apex angle from the direction of the in—owing inter-
stellar wind, and time as speci–ed by subspacecraft solar intensity. This modeling adequately reproduces

  

Source: Henry, Richard C.- Department of Physics and Astronomy, Johns Hopkins University

 

Collections: Physics