UNIVERSITY OF CAMBRIDGE Department of Applied Mathematics and Theoretical Physics

Solar active regions: the 1 MK loops

Giulio Del Zanna

Helen Mason

• 1  Introduction
• 1.1  Hot topic
• 2  Simultaneous TRACE/CDS off-limb observations
• 2.1  Some preliminary conclusions
• 2.2  Yohkoh SXT vs. CDS
• 2.3  A closer look at a loop leg
• 2.4  Spectra of the loop and background
• 2.5  Temperatures of region B
• 2.6  Temperatures of loop regions and background
• 3  Forward modelling
• 4  TRACE filter ratio method
• 4.1  TRACE temperature measurements along the loop
• 5  On-disc: the footpoints
• 5.1  Can we trust Skylab results on FIP-effects ?
• 6  On-disc observations
• 6.1  Loop A
• 6.2  Fan of loops B,C
• 6.3  Thin loop D
• 6.4  Densities
• 7  Conclusions - 1
• 8  Conclusions - 2
• 9  Conclusions - 3
• References