Showing posts with label atmosphere. Show all posts
Showing posts with label atmosphere. Show all posts

Sunday, 31 August 2008

Purple volcanic twilights, and KeyHole satellites

Last Friday evening was clear again. Looking outside in twilight, I noted the sky was amazingly purple, due to volcanic aerosols spewn by the Kasatochi volcano in the Aleutians. I walked a few blocks to the Witte Singel canal and shot this picture, with one of the domes of Leiden Observatory silhoutetted in the far distance:

(click image to enlarge)



Later that evening, I captured two Keyholes, USA 129 (96-072A) and USA 186 (05-042A), the Japanese satellite IGS 1A which made a small manoeuvre recently, and a very fine mag -3 flare by Iridium 65. Unfortunately, clouds came in later in the evening.

(click image to enlarge)