Multi-strand coronal loop model and filter-ratio analysis

Details Multi-strand coronal loop model and filter-ratio analysis Multi-strand coronal loop model and filter-ratio analysis

2009-11-18

arxiv.org/abs/0911.3506v1

Astro. Phys. J., 708, 1281 (2010)

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Scientific paper

10.1088/0004-637X/708/2/1281

We model a coronal loop as a bundle of seven separate strands or filaments. Each of the loop strands used in this model can independently be heated (near their left footpoints) by Alfv\'en/ion-cyclotron waves via wave-particle interactions. The Alfv\'en waves are assumed to penetrate the strands from their footpoints, at which we consider different wave energy inputs. As a result, the loop strands can have different heating profiles, and the differential heating can lead to a varying cross-field temperature in the total coronal loop. The simulation of TRACE observations by means of this loop model implies two uniform temperatures along the loop length, one inferred from the 171:195 filter ratio and the other from the 171:284 ratio. The reproduced flat temperature profiles are consistent with those inferred from the observed EUV coronal loops. According to our model, the flat temperature profile is a consequence of the coronal loop consisting of filaments, which have different temperatures but almost similar emission measures in the cross-field direction. Furthermore, when we assume certain errors in the simulated loop emissions (e.g., due to photometric uncertainties in the TRACE filters) and use the triple-filter analysis, our simulated loop conditions become consistent with those of an isothermal plasma. This implies that the use of TRACE/EIT triple filters for observation of a warm coronal loop may not help in determining whether the cross-field isothermal assumption is satisfied or not.

Affiliated with

Also associated with

No associations

Rating

Multi-strand coronal loop model and filter-ratio analysis 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 Multi-strand coronal loop model and filter-ratio analysis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-strand coronal loop model and filter-ratio analysis will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-241048