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Structure of scintillations in Neptune's occultation shadowAn exceptionally high-quality data set from a Neptune occultation is used here to derive a number of new results about the statistical properties of the fluctuations of the intensity distribution in various parts of Neptune's occultation shadow. An approximate numerical ray-tracing model which successfully accounts for many of the qualitative aspects of the observed intensity fluctuation distribution is introduced. Strong refractive scintillation is simulated by including the effects of 'turbulence' with projected atmospheric properties allowed to vary in both the direction perpendicular and parallel to the limb, and an explicit two-dimensional picture of a typical intensity distribution throughout an occulting planet's shadow is presented. The results confirm the existence of highly anisotropic turbulence.
Document ID
19880041525
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Hubbard, W. B.
(Arizona, University Tucson, United States)
Lellouch, Emmanuel
(Arizona Univ. Tucson, AZ, United States)
Sicardy, Bruno
(Arizona Univ. Tucson, AZ, United States)
Brahic, Andre
(Paris Observatoire, Meudon, France)
Vilas, Faith
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 13, 2013
Publication Date
February 1, 1988
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 325
ISSN: 0004-637X
Subject Category
Astronomy
Accession Number
88A28752
Funding Number(s)
CONTRACT_GRANT: NSG-7045
CONTRACT_GRANT: NSF AST-78-27879
Distribution Limits
Public
Copyright
Other

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