Determining the Structure of Solar Coronal Loops Using Their Evolution

Details Determining the Structure of Solar Coronal Loops Using Their Evolution Determining the Structure of Solar Coronal Loops Using Their Evolution

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...733...59m&link_type=abstract

The Astrophysical Journal, Volume 733, Issue 1, article id. 59 (2011).

Astronomy and Astrophysics

Astronomy

4

Sun: Corona, Sun: Uv Radiation

Scientific paper

Despite significant progress in understanding the dynamics of the corona, there remain several unanswered questions about the basic physical properties of coronal loops. Recent observations from different instruments have yielded contradictory results about some characteristics of coronal loops, specifically as to whether the observed loops are spatially resolved. In this paper, we examine the evolution of coronal loops through two extreme-ultraviolet filters and determine if they evolve as a single cooling strand. We measure the temporal evolution of eight active region loops previously studied and found to be isothermal and resolved by Aschwanden & Nightingale. All eight loops appear in "hotter" TRACE filter images (Fe XII 195 Å) before appearing in the "cooler" (Fe IX/Fe X 171 Å) TRACE filter images. We use the measured delay between the two filters to calculate a cooling time and then determine if that cooling time is consistent with the observed lifetime of the loop. We do this twice: once when the loop appears (rise phase) and once when it disappears (decay phase). We find that only one loop appears consistent with a single cooling strand and hence could be considered to be resolved by TRACE. For the remaining seven loops, their observed lifetimes are longer than expected for a single cooling strand. We suggest that these loops could be formed of multiple cooling strands, each at a different temperature. These findings indicate that the majority of loops observed by TRACE are unresolved.

Affiliated with

Also associated with

No associations

Rating

Determining the Structure of Solar Coronal Loops Using Their Evolution 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 Determining the Structure of Solar Coronal Loops Using Their Evolution, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Determining the Structure of Solar Coronal Loops Using Their Evolution will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1748157