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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.

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