Physics
Scientific paper
Nov 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001soph..203..255f&link_type=abstract
Solar Physics, v. 203, Issue 2, p. 255-287 (2001).
Physics
17
Scientific paper
We present multi-instrument observations of active region (AR) 8048, made between 3 June and 5 June 1997, as part of the SOHO Joint Observing Program 33. This AR has a sigmoid-like global shape and undergoes transient brightenings in both soft X-rays and transition region (TR) lines. We compute a magneto-hydrostatic model of the AR magnetic field, using as boundary condition the photospheric observations of SOHO/MDI. The computed large-scale magnetic field lines show that the large-scale sigmoid is formed by two sets of coronal loops. Shorter loops, associated with the core of the SXT emission, coincide with the loops observed in the hotter CDS lines. These loops reveal a gradient of temperature, from 2 MK at the top to 1 MK at the ends. The field lines most closely matching these hot loops extend along the quasi-separatrix layers (QSLs) of the computed coronal field. The TR brightenings observed with SOHO/CDS can also be associated with the magnetic field topology, both QSL intersections with the photosphere, and places where separatrices issuing from bald patches (sites where field lines coming from the corona are tangent to the photosphere) intersect the photosphere. There are, furthermore, suggestions that the element abundances measured in the TR may depend on the type of topological structure present. Typically, the TR brightenings associated with QSLs have coronal abundances, while those associated with BP separatrices have abundances closer to photospheric values. We suggest that this difference is due to the location and manner in which magnetic reconnection occurs in two different topological structures.
Démoulin Pascal
Fletcher Lyndsay
Lopez Fuentes Marcelo C.
Mandrini Cristina Hemilse
Mason Helen E.
No associations
LandOfFree
A Relationship Between Transition Region Brightenings, Abundances, and Magnetic Topology does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A Relationship Between Transition Region Brightenings, Abundances, and Magnetic Topology, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Relationship Between Transition Region Brightenings, Abundances, and Magnetic Topology will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1566868