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Uranus's northern polar cap in 2014.


ABSTRACT: In October and November 2014, spectra covering the 1.436 - 1.863-?m wavelength range from the SINFONI Integral Field Unit Spectrometer on the Very Large Telescope showed the presence of a vast bright North polar cap on Uranus, extending northward from about 40°N and at all longitudes observed. The feature, first detected in August 2014 from Keck telescope images, has a morphology very similar to the southern polar cap that was seen to fade before the 2007 equinox. At strong methane-absorbing wavelengths (for which only the high troposphere or stratosphere is sampled) the feature is not visible, indicating that it is not a stratospheric phenomenon. We show that the observed northern bright polar cap results mainly from a decrease in the tropospheric methane mixing ratio, rather than from a possible latitudinal variation of the optical properties or abundance of aerosol, implying an increase in polar downwelling near the tropopause level.

SUBMITTER: Toledo D 

PROVIDER: S-EPMC7296616 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature

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Uranus's northern polar cap in 2014.

Toledo Daniel D   Irwin Patrick G J PGJ   Teanby Nicholas A NA   Simon Amy A AA   Wong Michael H MH   Orton Glenn S GS  

Geophysical research letters 20180604 11


In October and November 2014, spectra covering the 1.436 - 1.863-μm wavelength range from the SINFONI Integral Field Unit Spectrometer on the Very Large Telescope showed the presence of a vast bright North polar cap on Uranus, extending northward from about 40°N and at all longitudes observed. The feature, first detected in August 2014 from Keck telescope images, has a morphology very similar to the southern polar cap that was seen to fade before the 2007 equinox. At strong methane-absorbing wav  ...[more]

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