This page demonstrates the use of keograms when checking for data availability or searching for interesting events.
A keogram is a time-versus-latitude plot created from the individual images captured during the night. They yield information of the auroral activity during the whole night in one easily transferable image. The current all-sky stations run by FMI produce keograms every day, and new data are placed in WWW for public access as soon as possible.
Keograms can be considered images from imaging photometers - the pixel column corresponds to the latitude coverage of the all-sky camera. In case of cameras with filters and a filter wheel, we usually create the keograms from the wavelength of 557.7nm (ie. green line). Colour images naturally result in colour keograms.
Please note that the instructions here should be considered guidelines. You should first use common sense in combining the tips below. Of course, for "real interpretation" we need to use the actual images.