HR: 14:30h
AN: SP13B-04    [Abstracts]
TI: EM Loci of CDS Loop Data
AU: * Schmelz, J T
EM: jschmelz@memphis.edu
AF: University of Memphis, Physics Department , Memphis, TN 38152
AU: Nasraoui, K
EM: knasrao1.memphis.edu
AF: University of Memphis, Physics Department , Memphis, TN 38152
AB: Our original analysis of the 1998 April 20 SOHO-CDS spectral line data for a coronal loop on the solar limb showed that the plasma was multi-thermal, both along the length of the loop as well as along the line of sight. Here we consider the effect of background subtraction on our analysis, and show EM Loci plots of three representative pixels, one near the loop apex, a second at the upper loop leg, and a third at the lower loop leg. Comparisons of the original and background-subtracted intensities show that the EM Loci are more tightly clustered after background subtraction, but that the plasma is still not well represented by an isothermal model. Possible explanations include a series of isothermal loops contributing along the line of sight, or multiple adjacent isothermal strands at different temperatures within the resolution element. Solar physics research at the University of Memphis is supported by NASA grants NAG5-9783 and NAG5-12096.
DE: 7509 Corona
SC: Solar Physics Division - AAS [SP]
MN: 2005 Joint Assembly