Fig6_13 Bastille Day Flare (right)

Fig6_13 Bastille Day Flare (right)

Fig. 6.13 . A powerful solar flare (left), occurring on Bastille day 14 July 2000, unleashed high-energy protons that began striking the SOlar and Heliospheric Observatory, abbreviated SOHO, spacecraft near Earth about 8 minutes later, continuing for many hours, as shown in the image taken 12 hours after the flare began (right). Both images were taken at a wavelength of 19.5 nanometers, emitted at the Sun by eleven times ionized iron, denoted Fe XII, at a temperature of about 1.5 million K, using the Extreme-ultraviolet Imaging Telescope, abbreviated EIT, on the SOlar and Heliospheric Observatory, or SOHO for short. (Courtesy of the SOHO EIT consortium. SOHO is a project of international cooperation between ESA and NASA.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University