Comparison of Sac Peak Fe XIV Index with Model Index Computed from EIT Differential Emission Measure Maps

Details Comparison of Sac Peak Fe XIV Index with Model Index Computed from EIT Differential Emission Measure Maps Comparison of Sac Peak Fe XIV Index with Model Index Computed from EIT Differential Emission Measure Maps

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp32b05c&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP32B-05

Physics

7509 Corona, 7537 Solar And Stellar Variability, 7538 Solar Irradiance

Scientific paper

We compare the Sac Peak Fe XIV green line index with a model index time series for the period of operations of the Extreme-ultraviolet Imaging Telescope (EIT) aboard the Solar and Heliospheric Observatory (SOHO), covering the years 1996-2000, from cycle minimum to the peak of the current activity cycle 23. We compute a differential emission measure (DEM) map for each day using images from the four channels of EIT at 171 Å, 195 Å, 284 Å, and 304 Å. From the daily DEM map we then calculate a daily Fe XIV 5304 Å intensity image (see Cook et al. 1999, Proceedings of the 8th SOHO Workshop, ESA SP-446, pp. 241-246). The Sac Peak index is an average intensity, measured using a circular aperture 1 arcmin in diameter sampling the corona in 1 degree steps around disk center. It is taken at several different heights beyond the daily limb. We modeled the index values, for the aperture center at 1.15 Rodot from disk center, as the average intensity within a daily annulus covering 1.12 - 1.18 Rodot imposed on the model intensity image. We compare the observed index with our model results, and discuss in terms of the accuracy of the model intensities which can be determined from our EIT-based DEM curves. We actually produce a daily Fe XIV image for the entire EIT field-of-view. The Sac Peak index provides one well calibrated, long term check on the reliability of the DEM model calculation. This work has been supported by NASA under W-19,348, and by the Office of Naval Research.

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