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THE ASTROPHYSICAL JOURNAL, 534:482489, 2000 May 1 2000. The American Astronomical Society. All rights reserved. Printed in U.S.A.(
 

Summary: THE ASTROPHYSICAL JOURNAL, 534:482»489, 2000 May 1
2000. The American Astronomical Society. All rights reserved. Printed in U.S.A.(
Ha AND SOFT X-RAY BRIGHTENING EVENTS CAUSED BY EMERGING FLUX
Y. H. TANG, Y. N. LI, AND C. FANG
Department of Astronomy, Nanjing University, Nanjing 210093, China; yhtang=nju.edu.cn
G. AULANIER, B. SCHMIEDER, AND P. DEMOULIN
Observatoire de Paris, dŌAstronomie Solaire et F-92195 Meudon, FranceDe partement Plane taire,
AND
T. SAKURAI
National Astronomical Observatory, Mitaka, Tokyo 181, Japan
Received 1998 April 24; accepted 1999 December 7
ABSTRACT
By using Y ohkoh soft X-ray images, vector magnetograms, and Ha –ltergrams, the brightening event
that occurred on 1994 May 18 has been studied in detail. It occurred in a nearly potential large-scale
magnetic con–guration as shown by the comparison between the magnetic extrapolation (linear force-
free –eld) and the large-scale soft X-ray loops. This event is related to the emergence of a new magnetic
—ux of about 3 ] 1020 Mx. The impulsive enhancement of the emerging —ux occurs about 20 minutes
before the peaks of the Ha and soft X-ray brightening and lasts for about 10 minutes. This brightening
may be a signature of reconnection taking place between the preexisting nonpotential loops and the new
emerging small loops. The magnetic energy provided by reconnection is likely to be stored in the non-

  

Source: Aulanier, Guillaume - Observatoire de Paris

 

Collections: Physics