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H. T. Blevins, J. T. Schmelz (University of Memphis)
In an attempt to determine the thermal nature of coronal loops, data from SOHO-EIT have been analyzed with isothermal approximations from narrow-band filter ratios: 171 (Fe IX-X; T = 1.3 MK) to 195 (Fe XII; T = 1.6 MK) angstroms and 195 (Fe XII; T = 1.6 MK) to 284 (Fe XV; T = 2.0 MK) angstroms. Numerous loops along the solar limb were selected and corresponding temperature maps were created. Uniform background subtraction was also applied in an attempt to remove any potential contamination from the loop data. Initial results indicate a discrepancy between the results produced by the two filter ratios. First, the temperatures that result from the 171-to-195 ratio are significantly lower than those that result from the 195-to-284 ratio, indicating that there may be plasma of different temperatures along the line of sight. Second, the 171-to-195 ratio seems to indicate that the temperature is uniform along the length of the loop, while the 195-to-284 ratio indicates that the temperature increases from the base of the loop to the top. Further investigation will be conducted to determine potential sources for these discrepancies.
Solar physics research at the University of Memphis is supported by NASA grant NAG5-9783.
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Bulletin of the American Astronomical Society, 34
© 2002. The American Astronomical Soceity.