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Astronomy & Astrophysics manuscript no. lpref1v2 April 29, 2005 (DOI: will be inserted by hand later)
 

Summary: Astronomy & Astrophysics manuscript no. lpref1v2 April 29, 2005
(DOI: will be inserted by hand later)
Electron density along a coronal loop observed with CDS/SOHO
I. Ugarte-Urra1, J. G. Doyle1, R.W. Walsh2, and M. S. Madjarska3,4
1
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland
2
Centre for Astrophysics, University of Central Lancashire, Preston, PR1 2HE, UK
3
Max-Planck-Institut fur Sonnensystemforschung , Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany
4
Department of Solar Physics, Royal Observatory of Belgium, Av. Circulaire 3, B-1180 Bruxelles, Belgium
Received / Accepted
Abstract. The analysis of a coronal loop observed by CDS and EIT on board SOHO is presented. The loop was situated
above the North-East limb at a latitude of 48
, being clearly visible in the hottest lines of the dataset, Fe XVI 360.76 , i.e.
greater than 2 000 000 K. The cooler lines in the sample (i.e. O V 629.73 and He I 584.35) showed only a brightening at the
footpoints location. Based on the Fe XIV 353.84/334.17 line ratio, the electron density along the loop was determined following
three different approaches for the background subtraction. No differences, within the error bars, can be found between the three
methods. At the apex, the density is 0.9 109

  

Source: Armagh Observatory

 

Collections: Physics