Each all-sky image file name consists of the information on which station took the image, the date
and time of the image, the filter selection and the exposure time.
North is to the top and east to the right in the image.
The last two time digits in the image file are for the milliseconds.
Below are nearly simultaneous sample images on 5 Jan, 2008 at the blue wavelength from Sodankylä
station where both the intensified imager and the emCCD camera are operated under the same dome.
An intensified ASC image from SOD at 22:58:00 UT
An emCCD image from SOD at 22:58:10.21 UT
An emCCD image at 22:58:10.21 UT, background image at 22:57:54.22 UT subtracted
An animation of SOD images from the night sampled above can be found here
(mov file of ~8MB). The animation is made of blue 427.8nm images at 21-22 UT. It shows a lot of small structures
and pulsating aurora. Because the bursty imaging mode the images have an uneven cadence. No background subtraction
is done for this event.
Another event (ave file of ~1.5MB) from SOD station consists of
non-filtered images alone. This was recorded on 28 Feb, 2008 at 22-24 UT.
More information: Kirsti Kauristie