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AGU: Geophysical Research Letters

 

Index Terms

  • Planetology: Fluid Planets: Interactions with particles and fields
  • Planetology: Fluid Planets: Remote sensing
  • Planetology: Solar System Objects: Jupiter
  • Solar Physics, Astrophysics, and Astronomy: X rays, gamma rays, and neutrinos

Abstract

Jovian X‐ray emission from solar X‐ray scattering

Ahilleas N. Maurellis

Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas

Thomas E. Cravens

Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas

G. Randall Gladstone

Southwest Research Institute, San Antonio, Texas

J. Hunter Waite

Southwest Research Institute, San Antonio, Texas

Loren W. Acton

Montana State University, Bozeman, Montana

Soft x‐ray emissions with brightnesses of about 0.01–0.2 Rayleighs have been observed from both the equatorial and auroral regions of Jupiter. It has been proposed that the equatorial emission, like the auroral emission, may be largely due to precipitation of energetic heavy ions into the atmosphere [Waite et al., 1997]. In this paper we model two alternative mechanisms for low‐latitude x‐ray emission: (1) elastic scattering of solar x‐rays by atmospheric neutrals, (2) fluorescent scattering of carbon K‐shell x‐rays from methane molecules located below the jovian homopause. Our modeled brightnesses agree, up to a factor of two, with the bulk of low‐latitude ROSAT measurements. This suggests that solar photon scattering (approximately 90% elastic scattering) may act in conjunction with energetic heavy ion precipitation to generate jovian equatorial x‐ray emission.

Received 2 September 1999; accepted 3 December 1999; .

Citation: Maurellis, A. N., T. E. Cravens, G. R. Gladstone, J. H. Waite, and L. W. Acton (2000), Jovian X‐ray emission from solar X‐ray scattering, Geophys. Res. Lett., 27(9), 1339–1342.

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