Weather Information - Latest All-sky Image

Image Applet


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Jump to: Current Sky Quality Plot

Description


Stacking - Images stacked from the all-sky camera are averaged at every minutes. The latest image refreshed automatically with cadence of 1min or intervalls selected by Refresh rate button. The resolution of image can be selected by Resolution button.

Image types - Four different type images can be selected by Type button: Daylight image is generated with simple averaging, suggested for daylight and twilight; Night image is dark corrected, suggested for dark nights; Daylight (gamma) image is generated with γ=0.8 correction to increase contrast; Night (gamma) image is dark corrected with γ=1.4 to increase brightness. The gamma corrected images are sensitive to clouds.

Past images - Images can be acessed back to 1h by Back to buttons (cadence of 5min) or by selecting the appropriate frame by Display frame button.

Sky quality - The quality of sky (taking into account the cloud coverage, air transparency and Moon light) shown in the left corner (yellow text) of the current image. The sky quality is calculated by the visibility of bright stars, and its estimation starts at civil dust (when the Sun goes below azimuthal angle of -6°) and ends at civil dawn (when the Sun goes above azimuthal angle of -6°). The sky quality estimation uses the photometric pipeline fitsh. SKY_QUALITY=0.00 means 100% cloud coverage, while SKY_QUALITY=1.00 means clear sky. (Special thanks to A. Pál for this tool!)

Weather information - All the data provided by the Weather Station are shown in the left corner (steel blue) of the image. For detailed graphical presentation of daily variation, see Current Weather.


ToC