Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp21b07c&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SP21B-07
Physics
7509 Corona, 7546 Transition Region, 7594 Instruments And Techniques
Scientific paper
Through the use of differential emission measure curves for points along coronal loops on the limb, physical characteristics can be determined that will help further constrain current theoretical models. This study used data obtained from observations taken on 20 Apr 1998 and 13 Nov 1997 by both the Solar and Heliospheric Observatory Coronal Diagnostic Spectrometer and the Yohkoh Soft X-ray Telescope. Pixel coordinates were established for multiple points along each loop, and the intensities of different spectral lines were calculated for each pixel. Differential emission measures curves were constructed for each of the chosen points, and the density and pressure at each position was determined. Radiative and conductive losses are also calculated from the data. The arc length of the loop was measured and the temperature scale heights for specific ions were calculated and compared to the observed heights above the limb. A significant intensity is measured for the O V line at 629.73 angstroms with a peak formation temperature of T = .26 MK in both loops about 50 scale heights above the limb. In order to account for these O V intensities, the oxygen abundance must be enhanced by a factor of 10 to 40 above normal coronal values; or the cool end (below 1 MK) of the differential emission measure curves must turn up again, even for the pixels at the top of the loops, well off the limb.
Allen Dale J.
Cirtain Jonathan W.
Hubbard P. J.
Schemlz J. T.
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