Green an blue flash at sunset behind mountain range

Almost every times when on Mt. Wendelstein the sun is setting behind the main chain of the Alps in very clear air, I can watch the green and the blue flash. These phenomena were especially impressive on February 2, 2011, when the sun sat behind 2962 meters high Mt. Zugspitze, and on March 3 at sunset behind the 1801 meters high Benediktinerwand (series 2).

Author: Claudia Hinz, Brannenburg, Germany

Omega sun

On June 26, 2011, Laslo Segi could photographically record this nice moment. “It looked like a second sun rising from the sea, although the sun was just setting.”(1)

“Some time later I learned that it was a lower mirage, that means that the sky is reflected upwards by a thin layer of warm air above the ground.”

This is caused by air layers of different temperature. At the boundary surface, light is totally reflected causing these phenomena. This phenomenon, however, is called “Omega-sun”, because the shape of the sun is similar to the Greek letter omega.

Photo taken on 26.06.2011 in Croatia/Fazana

Author: Laslo Segi / Michael Großmann, Kämpfelbach, Germany

Fascinating moonrise during an atmospheric inversion

After a bleak low stratus day, I decided to escape from the fog in the evening of the 13th of January 2009. I drove to the nearby Witthoh (Hegaualb, western Lake Constance, Southern Germany). There I wanted to record the rise of the moon – at least I hoped for a clinched moonrise, because of a prevailing atmospheric inversion.

Along the 860-metre-high Witthoh there was still a temperature of -10 degree centigrade. Two kilometers further away and 100 m higher the temperature was just 0 degree centigrade. Consequently, a very remarkable temperature layer existed in this region.
On the pre-calculated time, the moon’s upper margin pushed over the horizon.
What happened afterwards exceeded my boldest dreams. A “bubbling” of the rising moon followed as I had never seen it before.

Three times, approximately half of the rising moon completely detached from the lower half with red lightning.

The moon “boiled” on the upper half and it let vanish red and green rays upwards.

Only after circa 15 minutes, the moon calmed down completely.

Here is one more link of the moonrise as animated GIF file!

Posted by Harald Wochner

Sunset sequence

This sequence of images of the setting sun was taken on September 14th, 2008, from Beverly Beach, Oregon, on an evening when sea mist partly obscured the sun. A vague green colour appeared on the upper edge of only one or two of these images.

Author: Alan Clark, Calgary, Canada

Gree-blue Flash over the Canadian Rockies

This sequence of sunset images was taken from the Canadian prairies, looking ovcr the Rocky Mountains from a distance of about 100 km, in mid-December, 2007. The remaining solar limb shows distinct blue colour following green tints, but the sequence ends with a faint red band, which is probably caused by faint clouds on the horizon.

Author: Alan Clark, Canada

Green and Blue flash

On December 26th I climbed the 1000m high Plettenberg to observe and photograph the setting sun with 1m focal length to look for the green flash. The transparent air and an inversion layer were promising, however a few clouds with their top at approximately the same altitude were disturbing. The upper limb of the sun turned out to be quite turbulent showing green rims and flashes, but also some blueish apparitions.

Why a blue flash?
A green rim of the setting or rising sun occurs due to differential refraction in the atmosphere. If conditions are extremely clear, also the blue light has a chance to get through, and there might be even a blueish rim. With a temperature inversion layer in the atmosphere, upper segments of the solar image might get separated from the rest of the solar disc. In the final moments of these elusive segments they do appear green and sometimes even blue (green or blue flash). However, it is not clear to me why in my observations both happens. Most last moments are green, whereas the third frame shows a blue color and at the same time other turbulent segments with a green color. Should not every segment turn from green to blue, at least in the very last visible moment?
Maybe something more than just clear air plays a role for a blue flash visibility!?
It is the first time I see green and blue flashes simultaneously in one image. I strongly encourage other observers to record video data to show these effects in higher time resolution.

Image sequence with description

Author: Till Credner