A dataset consisting of Ca II & H-alpha images taken at the Paris Meudon Observatory. Synthetically generated cloud coverage has been applied to clean images, thereby creating an (cloudy, clean) pair-
Reference material such as mathematical tables and computational aids created by and/or used by staff in the course of their astronomical work at the Sydney Observatory.
<p><b>Description:</b><br /> Extinciton maps made from 2MASS and NICER (Near Infrared Extinction-method Revisited). This map is made from the final 2MASS data release and cover