OMEGA detection of oxygen nightglow on Mars
The OMEGA instrument on Mars Express has detected oxygen emission at the night side of Mars. The emission, at a wavelength of 1.27 µm, was detected on three occasions during a series of 40 observations made by OMEGA above the planet's limb.
The panels above show, from left to right:
- a 2.2° wide swath of the observed limb at night with emission coded in pink;
- the vertical distribution of the intensity observed in megaRayleigh (MR) - integration over azimuth. The red line is a smoothed version of the distribution;
- the integrated observed spectrum, showing emission only at 1.27 µm.