Argh-who took a chunk out of my image?
If you are seeing strange images around 05:00 -09:30 UTC Depending on orbital position and satellite, like the ones below, don’t immediately run to check all your settings and connections!!
It can happen around satellite local midnight time, and the ABIwould see a direct head-on view of the sun near the edge of the earth. This could damage the ABI imager (in the same way as your eye’s retina or camera sensor could be damaged) so steps are taken to prevent this from happening while preserving as much of the rest of the image as possible.
But how? To avoid direct solar light contamination onto the ABI detectors and maintain healthy performance of the ABI sensor, the solar avoidance routine was scheduled by analyzing part of the ABI swaths according to the angle between the ABI instrument and solar position at certain times of the year, then steering the ABI scan mirrors away from observing the scan lines of the Earth scene during that time period.
The Lens flare (the little lightning bolt-shaped flare), is caused when the refraction of light passing through the atmosphere of the earth (the angle of solar light through the atmosphere can be as large as 0.6°) is great enough to still hit a portion of the ABI imager.
Since each band absorbs a differing bandwidth of light, a compromise equation of all bands is used to try and get the maximum amount of usable imagery on all bands. This will ‘flip’ to the southern hemisphere in February.