Calibration of TRACE Lyman-alpha Images using SOHO/SUMER Observations

Details Calibration of TRACE Lyman-alpha Images using SOHO/SUMER Observations Calibration of TRACE Lyman-alpha Images using SOHO/SUMER Observations

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...3e..83r&link_type=abstract

Solar Active Regions and 3D Magnetic Structure, 26th meeting of the IAU, Joint Discussion 3, 16-17 August, 2006, Prague, Czech R

Computer Science

Scientific paper

Hydrogen Lyman-alpha (Lα) line at 1216 Å is one of the brightest emission lines formed in the chromosphere and the transition region, thereby it is a natural tracer of solar activity in those regions. Lα images from the Transition Region and Coronal Explorer (TRACE) can be used to study the morphology and evolution of active regions on the Sun as well as the variability of solar irradiance. However, 1216 Å channel images from TRACE contain not only the desired Lα line emission from the Sun, but also some UV continuum around 1600 Å. By comparing TRACE data with Lα images from the Very High Angular Resolution Ultraviolet Telescope, Handy et al. proposed a simple procedure to remove the contamination: a linear combination of 1216 Å and 1600 Å channel images from the TRACE. In order to check the reliability of this procedure, here we compare TRACE data with Lα raster scan images from the SUMER instrument onboard Solar and Heliospheric Observatory (SOHO). We obtain a linear combination coefficient very similar to that of Handy et al., and also find that the apparent spatial resolution of the Lα raster scan images from the SOHO/SUMER is at least 4"×4", which is more than 2-4 times larger than that of its single spectrum.

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