Magnetic Field Topology and the Thermal Structure of the Corona over Solar Active Regions

Details Magnetic Field Topology and the Thermal Structure of the Corona over Solar Active Regions Magnetic Field Topology and the Thermal Structure of the Corona over Solar Active Regions

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...719.1083s&link_type=abstract

The Astrophysical Journal, Volume 719, Issue 2, pp. 1083-1096 (2010).

Astronomy and Astrophysics

Astronomy

5

Sun: Corona, Sun: Magnetic Topology

Scientific paper

Solar extreme ultraviolet (EUV) images of quiescent active-region coronae are characterized by ensembles of bright 1-2 MK loops that fan out from select locations. We investigate the conditions associated with the formation of these persistent, relatively cool, loop fans within and surrounding the otherwise 3-5 MK coronal environment by combining EUV observations of active regions made with TRACE with global source-surface potential-field models based on the full-sphere photospheric field from the assimilation of magnetograms that are obtained by the Michelson Doppler Imager (MDI) on SOHO. We find that in the selected active regions with largely potential-field configurations these fans are associated with (quasi-)separatrix layers (QSLs) within the strong-field regions of magnetic plage. Based on the empirical evidence, we argue that persistent active-region cool-loop fans are primarily related to the pronounced change in connectivity across a QSL to widely separated clusters of magnetic flux, and confirm earlier work that suggested that neither a change in loop length nor in base field strengths across such topological features are of prime importance to the formation of the cool-loop fans. We discuss the hypothesis that a change in the distribution of coronal heating with height may be involved in the phenomenon of relatively cool coronal loop fans in quiescent active regions.

Affiliated with

Also associated with

No associations

Rating

Magnetic Field Topology and the Thermal Structure of the Corona over Solar Active Regions 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 Magnetic Field Topology and the Thermal Structure of the Corona over Solar Active Regions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic Field Topology and the Thermal Structure of the Corona over Solar Active Regions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1863135