Image Details
 
                    Caption: Fig. 2.
Top: EIT difference image during the precursor phase of the 2001 September 24 event; the letters A and B indicate the location of the brightenings. Bottom: Magnetic field configuration above the active region derived by applying a potential source‐surface extrapolation to magnetograph measurements of the photospheric field.
© 2007. The American Astronomical Society. All rights reserved. Printed in U.S.A.