M-class solar flare | John Stetson

Photographer
John Stetson
Email
jstetson@maine.rr.com
Location of photo
Falmouth, Maine
Date/Time of photo
April 16, 2012, 18:10 UT
Equipment
90mm h-alpha filter, webcam
Description
Here is an approximation of the speed of the April 16 solar flare and the size after 25 minutes: The attached image the April 16 M-class solar flare has been inserted into a full-disk (inverted) image of the sun taken on the 13th. 109 earths fit across the sun's angular diameter. It appears that in 25 minutes the flare extended out a distance of 40 earths from the sun's limb. 317160 miles was covered in 25 minutes. Speed? 761,184 miles per hour.
All comments must follow the Sky & Telescope Terms of Use and will be moderated prior to posting. Please be civil in your comments. Sky & Telescope reserves the right to use the comments we receive, in whole or in part, and to use the commenter’s username, in any medium. See also the Terms of Use and Privacy Policy.

COMMENT