Aurora Report 23-24 April 2012 & Photo's
Posted 24 April 2012 - 11:59
Photo's taken on my K200D Pentax bulb setting with cable remote and tripod F3.5 18mm focal length bit higher on a few closer shots, ISO varied mainly between 800/1600 and a few at 400, exposure times mainly 10secs 1600iso ,15-20sec 800iso. Prefeere the 10 sec exposures because this prevents the wash out effect of pillars moving. Photos taken in Raw format converted to JPEG with some lighting adjustments the processed with Neat Image as due to the hi ISO used and having the camera noise reduction system turned off due to processing delay between shot it cause's Neat Images carries this out post shot with a handy profile download you get for your camera.
A selection of photos below, The full sequence of the storm can be seen on Flickr http://www.flickr.co...57629888944663/
Posted 24 April 2012 - 19:52
Video here time lapse of pulsating Aurora it says can last 1-30secs the one's I saw last night lasted about a second http://vimeo.com/28383882
Link here into the investigation of Pulsating , Something to do with the effects of the Van Allan Radiation Belt . http://www.eos.unh.e...12/rocket.shtml
Van Allens Radiation Belt http://imagine.gsfc....rs/970228a.html
Jeez it get complicated, should have stuck in at school. From what I can gather from above the Pulsating Aurora is affected by the Van Allen radiation belt which is a belt of radiation held in orbit by the Earths magnetic pull. Classic Aurora is not affected by this. They say it normally occurs after an Aurora Display and most observers miss it. Last night it happened during a fainter part of the display but the brighter pillars came up after this. Scratches head and goes for a line down.
Posted 24 April 2012 - 22:08