EUNIS 2013 and Beyond: Resolving the AIA 94 and 131 Å Bandpasses

The Extreme Ultraviolet Normal Incidence Spectrograph (EUNIS) sounding rocket instrument is a two-channel imaging spectrograph that observes the solar corona and transition region with high spectral resolution and a rapid cadence made possible by unprecedented sensitivity. The 2013 flight on 23 April at 17:30 UT incorporated a new wavelength channel covering the range 525-630 Å, the previously-flown 300-370 Å channel, and the first flight demonstration of cooled active pixel sensor (APS) arrays, resulting in high-signal-to-noise spectral coverage spanning a wide temperature range of 0.025 to 10 MK. Absolute radiometric calibration of the two channels is performed using a hollow cathode discharge lamp and NIST-calibrated AXUV-100G photodiode. For the 2013 flight, EUNIS co-observed dynamic coronal phenomena with DST/IBIS, SoHO/CDS, SDO/AIA and Hinode/EIS and contributes to the absolute radiometric calibrations of these instruments. Plans for future wavelength channels to cover the AIA 94 and 131 Å bandpasses and address the currently unresolved spectral lines (and therefore temperature responses) within them are presented.