Several observers are now producing valuable images in the near-infrared methane absorption band, at the wavelength of 890nm. These images record high-altitude clouds and hazes. This article discusses the relative selectivity of the filters used by different observers, the features shown by them in 1999/2000, and the aspects that will be of interest for routine monitoring by methane images. These include the polar hoods, the equatorial zone, possibly erupting plume heads, anticyclonic ovals, and large scale disturbances of the major belts.
Journal of the British Astronomical Association
- Pub Date:
- June 2003