Emission-Line Imaging of Saturn's H+3 Aurora

Details Emission-Line Imaging of Saturn's H+3 Aurora Emission-Line Imaging of Saturn's H+3 Aurora

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...675l.117s&link_type=abstract

The Astrophysical Journal, Volume 675, Issue 2, pp. L117-L120.

Astronomy and Astrophysics

Astronomy

4

Atmospheric Effects, Infrared: Solar System, Planets And Satellites: Individual: Saturn, Techniques: Spectroscopic

Scientific paper

We present the first-ever infrared image of Saturn's auroral emission taken from Earth, using the CSHELL instrument on NASA's InfraRed Telescope Facility. We adapt the emission-line imaging technique to use the spectrometer as an ultra-narrowband imager, measuring the H+3 line at 3.953 μm with a spectral resolution of ~5000. Calibrating this technique with Jupiter shows a significant increase in sensitivity over the narrowest H+3 filters available. The resulting image of Saturn's auroral region confirms that the infrared main auroral oval is broadly similar to that seen in ultraviolet observations with a partially filled-in polar cap. It also shows that significant variations in brightness occur within the oval itself.

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