Structure of scintillations in Neptune's occultation shadow

Details Structure of scintillations in Neptune's occultation shadow Structure of scintillations in Neptune's occultation shadow

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...325..490h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 325, Feb. 1, 1988, p. 490-502.

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14

Neptune Atmosphere, Scintillation, Stellar Occultation, Atmospheric Models, Light Curve, Monte Carlo Method, Upper Atmosphere

Scientific paper

The intensity residuals in the stellar occultation by Neptune on 1985 August 20 are examined. These residuals (scintillations) are calculated by subtracting a best-fit oblate isothermal atmosphere model from the observed light curves at two stations in Chile and one station in Hawaii. Because of exceptionally high signal-to-noise, scintillations were observable throughout the occultation. The data are consistent with an intensity fluctuation distribution in Neptune's shadow which has extended barlike patterns lying parallel to the limb in the vicinity of the half-intensity level but which then converts to predominantly radial streaks near the center. A theoretical model of scale-free refractivity disturbances in Neptune's upper atmosphere, with considerable anisotropy, is able to account for most of the observed characteristics.

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