James Whitby wrote:

As did I. Not everyone captured the effect, but it can be captured on
film. SWAG: an atmospheric effect?



I saw a lecture that stated that the effect was due to blurring caused
by a combination of diffraction effects and terrestrial atmospheric
turbulence,

For a more detailed explanation see Icarus 168 pp249-256 (2004),
abstract available from ADS:

http://adsabs.harvard.edu/cgi-bin/np...ea7c9b63a15607

--
Dr. James Whitby Tel: +41 (0)31 6314409
Physikalisches Institut Fax: +41 (0)31 6314405
Universitaet Bern
Sidlerstrasse 5
3012 Bern, Switzerland.