Limits on the diurnal variation of H2 quadrupole features in Neptune

Details Limits on the diurnal variation of H2 quadrupole features in Neptune Limits on the diurnal variation of H2 quadrupole features in Neptune

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...343..450s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 343, Aug. 1, 1989, p. 450-455.

Astronomy and Astrophysics

Astrophysics

2

Hydrogen, Neptune (Planet), Planetary Composition, Abundance, Diurnal Variations, Echelle Gratings, Methane, Molecular Spectra, Quadrupoles, Spectral Line Width, Neptune, Diurnal Variations, Hydrogen, Quadrupole, Spectra, Atmosphere, Absorption, Aerosols, Troposphere, Optical Properties, Haze, Opacity, Brightness, Compositon, Distribution, Earth-Based Observations, Clouds, Ccd Methods, Morphology, Numerical Methods, Methane, Condensation

Scientific paper

Spectral profiles of the H2 S4(0) and S4(1) lines are presented for Neptune on three consecutive nights; no variation is detected in the equivalent widths of the H2 4-0 features to within an observational uncertainty of about 20 percent. Comparisons with previous H2 quadrupole observations indicate that no secular trends have been detected over about 15 yr. The equivalent-width error limits are interpreted in terms of the maximum variability of Neptunian tropospheric aerosols. Specifically, the error bars for the globally averaged equivalent widths of the two H2 quadrupole absorption features constrain the bottom of the visible atmosphere, as defined by a bright optically infinite isotropically scattering cloud, to be 2.9 + or - 0.6 bars, while the methane haze opacity is constrained to be 0.30 + or - 0.25.

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