Jan Timmermans
Image taken:
Oct. 18, 2010
Location:
Valkenswaard, The Netherlands.
Details:
What a whopping mastodont of a filament: I had problems to get it in my Field-of-View. I measured the size of the filament at 39x Earth - 550.000km. To measure the size I used the "Measuring the size of a prominence" scenario of my Sun Ha Tutorial. Imaging equipment: just a standard PST with 2.5x Powermate and a webcam.
 
©2013, SpaceWeather.com -- This site is penned daily by Dr. Tony Phillips.