Absolute Radiometric Calibration Of EUNIS, And Calibration Updates For Hinode/EIS And SOHO/CDS

Details Absolute Radiometric Calibration Of EUNIS, And Calibration Updates For Hinode/EIS And SOHO/CDS Absolute Radiometric Calibration Of EUNIS, And Calibration Updates For Hinode/EIS And SOHO/CDS

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640704w&link_type=abstract

American Astronomical Society, AAS Meeting #216, #407.04; Bulletin of the American Astronomical Society, Vol. 41, p.860

Computer Science

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Scientific paper

The Extreme-Ultraviolet Normal-Incidence Spectrograph sounding rocket payload was flown in 2006 (EUNIS-06) and 2007 (EUNIS-07), each time carrying two independent imaging spectrographs covering wave bands of 300-370 Angstrom in first order and 170-205 Angstrom in second order. For each flight, the absolute radiometric response of the EUNIS long-wavelength (LW) channel was directly measured in the same facility used for pre-flight calibrations of SOHO/CDS and Hinode/EIS. The wavelength range of the EUNIS LW channel overlaps that of CDS/NIS-1, and so can provide a direct calibration update for it. The EUNIS-06 observation shows that the efficiency of CDS/NIS-1 has decreased by a factor about 1.7 compared to that of the previously implemented calibration. Here we present an update to the absolute calibration for Hinode/EIS derived with a technique that combines a direct comparison of line intensities observed in cospatial EUNIS-07 and EIS spectra, along with density- and temperature-insensitive line intensity ratios.

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