CCD imaging of Neptune at methane-band wavelengths

Hammel, Heidi B.

doi:10.1016/0273-1177(90)90092-e

Advances in Space Research

1990

DOI: 10.1016/0273-1177(90)90092-e

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CCD imaging of Neptune at methane-band wavelengths

Heidi B. Hammel

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2001

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The Altitude of an Infrared-bright Cloud Feature on Neptune from Near-Infrared Spectroscopy

Roe

Graham

McLean

et al. 2001

The Astronomical Journal

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We present 2.03È2.30 km near-infrared spectroscopy of Neptune taken 1999 June 2 (UT) with the W. M. Keck ObservatoryÏs near-infrared spectrometer (NIRSPEC) during the commissioning of the instrument. The spectrum is dominated by a bright cloud feature, possibly a storm or upwelling, in the southern hemisphere at approximately 50¡ south latitude. The spectrum also includes light from a dimmer northern feature at approximately 30¡ north latitude. We compare our spectra (j/*j D 2000) of these two features with a simple model of NeptuneÏs atmosphere. Given our model assumption that the clouds are Ñat reÑecting layers, we Ðnd that the top of the bright southern cloud feature sat at a pressure level of bars, and thus this cloud did not extend into the stratosphere bars). A similar 0.14~0 .03 0.05 (P [ 0.1 analysis of the dimmer northern feature yields a cloud-top pressure of 0.084^0.026 bars. This suggests that the features we observed efficiently transport methane to the base of the stratosphere but do not directly transport methane to the upper stratosphere (P \ 10~2 to 10~3 bars), where photolysis occurs. Our observations do not constrain how far these clouds penetrate down into the troposphere. We Ðnd that our model Ðts to the data restrict the fraction of in ortho-para thermodynamic equilibrium to H 2 greater than 0.8.

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The Altitude of an Infrared-bright Cloud Feature on Neptune from Near-Infrared Spectroscopy

Roe

Graham

McLean

et al. 2001

The Astronomical Journal

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show abstract

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CCD imaging of Neptune at methane-band wavelengths

Cited by 1 publication

References 26 publications

The Altitude of an Infrared-bright Cloud Feature on Neptune from Near-Infrared Spectroscopy

The Altitude of an Infrared-bright Cloud Feature on Neptune from Near-Infrared Spectroscopy

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