Coordinated Observations of AR 11726 by Hinode/EIS and EUNIS-2013

The Extreme-Ultraviolet Normal-Incidence Spectrograph (EUNIS) sounding rocket payload was flown on 2013 April 23 with two independent channels covering the 300-370 A and 525-635 A wavebands. EUNIS-2013 observed two targets on the solar disk that included quiet sun, active regions, a flare, and a micro-flare. The active region AR 11726 was co-observed with the EUV Imaging Spectrometer (EIS) on Hinode. The radiometric response of EUNIS is measured in the laboratory using a NIST-calibrated photodiode and hollow cathode discharge lamp. A density- and temperature- insensitive line intensity ratio technique can be used to derive an in-flight calibration update of Hinode/EIS. Measurements of EIS emission lines with respect to EUNIS lines, including Fe X to Fe XII and Si X, provide a comparison between the calibrations of the two instruments. The radiometric calibration of EUNIS-2013 is also validated using the same insensitive ratio technique with emission lines such as Mg VIII, Fe XI, Fe XVI, and Si IX.