Monday, November 06, 2006

Lunar display in France with 9° halo and Lowitz arcs

On the evening of 30 october 2006, I saw this lunar Display in the west of France, close to Nantes. The photos were taken between 18h and 21h UT, the moon elevation was between 19 and 24 degrees.
A lot of halos were visible, including 9° halo, upper and lower Lowitz arc and a bright upper suncave Parry arc.

The orange colour of the sky is due to a strong light pollution. The images have been processed to reduce this effect and unsharp mask has been applied to enhance the halos. I got also nice displays the 2 previous days.
More images of the display here: 1, 2, 3.

1 Comments:

Blogger Marko Riikonen said...

It seems like there is an upper part of upper Lowitz arc separating from Parry in the lower photo as well as in the "more images" no 1. In image no 1 brightening of Parry from the Lowitz contact point is noticable (the "Mikkilä Parry" -effect, maybe we should try simulating them again).

Plate and column Lowitz arcs should not have much to do with each other, but there are already so many cases of them occurring together that the thing can't no longer be wiped under the rug.

I just wonder do we actually know much at all about the Lowitz arcs.

15 November, 2006  

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