Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-01-21
Astrophys.J.691:503,2009
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Scientific paper
10.1088/0004-637X/691/1/503
Surprisingly few solar coronal loops have been observed simultaneously with TRACE and SOHO/CDS, and even fewer analyses of these loops have been conducted and published. The SOHO Joint Observing Program 146 was designed in part to provide the simultaneous observations required for in-depth temperature analysis of active region loops and determine whether these loops are isothermal or multithermal. The data analyzed in this paper were taken on 2003 January 17 of AR 10250. We used TRACE filter ratios, emission measure loci, and two methods of differential emission measure analysis to examine the temperature structure of three different loops. TRACE and CDS observations agree that Loop 1 is isothermal with Log T $=$ 5.85, both along the line of sight as well as along the length of the loop leg that is visible in the CDS field of view. Loop 2 is hotter than Loop 1. It is multithermal along the line of sight, with significant emission between 6.2 $<$ Log T $<$ 6.4, but the loop apex region is out of the CDS field of view so it is not possible to determine the temperature distribution as a function of loop height. Loop 3 also appears to be multithermal, but a blended loop that is just barely resolved with CDS may be adding cool emission to the Loop 3 intensities and complicating our results. So, are coronal loops isothermal or multithermal? The answer appears to be yes!
Cirtain Jonathan W.
DeLuca Edward E.
Kimble J. A.
Mason Harris E.
Nasraoui Kaouther
No associations
LandOfFree
Are Coronal Loops Isothermal or Multithermal? Yes! 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 Are Coronal Loops Isothermal or Multithermal? Yes!, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Are Coronal Loops Isothermal or Multithermal? Yes! will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-684816