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The Astrophysical Journal, 700:559578, 2009 July 20 doi:10.1088/0004-637X/700/1/559 C 2009. The American Astronomical Society. All rights reserved. Printed in the U.S.A.
 

Summary: The Astrophysical Journal, 700:559­578, 2009 July 20 doi:10.1088/0004-637X/700/1/559
C 2009. The American Astronomical Society. All rights reserved. Printed in the U.S.A.
THE NATURE OF FLARE RIBBONS IN CORONAL NULL-POINT TOPOLOGY
S. Masson1
, E. Pariat2,4
, G. Aulanier1
, and C. J. Schrijver3
1 LESIA, Observatoire de Paris, CNRS, UPMC, Universit´e Paris Diderot, 5 Place Jules Janssen, 92190 Meudon, France; sophie.masson@obspm.fr
2 Space Weather Laboratory, NASA Goddard Space Flight Center Greenbelt, MD 20771, USA
3 Lockheed Martin Solar and Astrophysics Laboratory, 3251 Hanover Street, Palo Alto, CA 93304-1191, USA
Received 2008 December 26; accepted 2009 May 28; published 2009 July 2
ABSTRACT
Flare ribbons are commonly attributed to the low-altitude impact, along the footprints of separatrices or quasi-
separatrix layers (QSLs), of particle beams accelerated through magnetic reconnection. If reconnection occurs
at a three-dimensional coronal magnetic null point, the footprint of the dome-shaped fan surface would map
a closed circular ribbon. This paper addresses the following issues: does the entire circular ribbon brighten
simultaneously, as expected because all fan field lines pass through the null point? And since the spine separatrices
are singular field lines, do spine-related ribbons look like compact kernels? What can we learn from these
observations about current sheet formation and magnetic reconnection in a null-point topology? The present
study addresses these questions by analyzing Transition Region and Coronal Explorer and Solar and Heliospheric

  

Source: Aulanier, Guillaume - Observatoire de Paris
Schrijver, Karel - Solar and Astrophysics Laboratory, Lockheed Martin

 

Collections: Physics