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Flights of Goddard Space Flight Center's Extreme-Ultraviolet Normal-IncidenceSpectrograph (EUNIS) sounding rocket in 2006 and 2007 provided updatedradiometric calibrations for SOHO/CDS and Hinode/EIS. EUNIS carried twoindependent imaging spectrographs covering wavebands of 300-370 A in firstorder and 170-205 A in second order. After each flight, end-to-end radiometriccalibrations of the rocket payload were carried out in the same facility usedfor pre-launch calibrations of CDS and EIS. During the 2007 flight, EUNIS, SOHOCDS and Hinode EIS observed the same solar locations, allowing the EUNIScalibrations to be directly applied to both CDS and EIS. The measured CDS NIS 1line intensities calibrated with the standard (version 4) responsivities withthe standard long-term corrections are found to be too low by a factor of 1.5due to the decrease in responsivity. The EIS calibration update is performed intwo ways. One is using the direct calibration transfer of the calibratedEUNIS-07 short wavelength (SW) channel. The other is using the insensitive linepairs, in which one member was observed by EUNIS-07 long wavelength (LW)channel and the other by EIS in either LW or SW waveband. Measurements fromboth methods are in good agreement, and confirm (within the measurementuncertainties) the EIS responsivity measured directly before the instrument'slaunch. The measurements also suggest that the EIS responsivity decreased by afactor of about 1.2 after the first year of operation. The shape of the EIS SWresponse curve obtained by EUNIS-07 is consistent with the one measured inlaboratory prior to launch. The absolute value of the quiet-Sun He II 304 Aintensity measured by EUNIS-07 is consistent with the radiance measured by CDSNIS in quiet regions near the disk center and the solar minimum irradianceobtained by CDS NIS and SDO/EVE recently.

Underflight calibration of SOHO/CDS and Hinode/EIS with EUNIS-07