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RESISTIVE EMERGENCE OF UNDULATORY FLUX TUBES E. Pariat, G. Aulanier, and B. Schmieder1
 

Summary: RESISTIVE EMERGENCE OF UNDULATORY FLUX TUBES
E. Pariat, G. Aulanier, and B. Schmieder1
Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique (LESIA), Observatoire de Meudon, 5 place Jules Janssen,
F-92195 Meudon Cedex, France; etienne.pariat@obspm.fr
and
M. K. Georgoulis, D. M. Rust, and P. N. Bernasconi
Applied Physics Laboratory, Johns Hopkins University, 11100 Johns Hopkins Road, Laurel, MD 20723-6099
Received 2004 May 11; accepted 2004 June 23
ABSTRACT
During its 2000 January flight, the Flare Genesis Experiment observed the gradual emergence of a bipolar
active region, by recording a series of high-resolution photospheric vector magnetograms and images in the blue
wing of the H line. Previous analyses of these data revealed the occurrence of many small-scale, transient H
brightenings identified as Ellerman bombs (EBs). They occur during the flux emergence, and many of them are
located near moving magnetic dipoles in which the vector magnetic field is nearly tangential to the photosphere.
A linear force-free field extrapolation of one of the magnetograms was performed to study the magnetic topology
of small-scale EBs and their possible role in the flux emergence process. We found that 23 out of 47 EBs are
cospatial with bald patches (BPs), while 15 are located at the footpoints of very flat separatrix field lines passing
through distant BPs. We conclude that EBs can be due to magnetic reconnection, not only at BP locations, but
also along their separatrices, occurring in the low chromosphere. The topological analysis reveals, for the first
time, that many EBs and BPs are linked by a hierarchy of elongated flux tubes showing aperiodic spatial

  

Source: Aulanier, Guillaume - Observatoire de Paris

 

Collections: Physics