000006312 001__ 6312
000006312 005__ 20230201154505.0
000006312 037__ $$aPOSTER-2023-0021
000006312 100__ $$aTeriaca, L.
000006312 245__ $$aThe radiometric response and performance evolution of the HRILYA telescope of EUI from first light to now
000006312 260__ $$c2022
000006312 269__ $$c2022-09-12
000006312 520__ $$aHRILYA is the intensified high-resolution telescope of the EUI instrument operating at the Lyman alpha line of Hydrogen. The telescope obtained the first light images on April 12th 2020 and, since then, has acquired images of the solar surface on about 80 different days until June 2022 (last analysed data). Some of these observations were obtained specifically to calibrate the instrument response to different settings of the high voltages and of the CMOS/APS sensor of the camera and integrate the available measurements taken on the ground. This pre-calibration step is essential in comparing data taken with different setups. By considering only data taken near disk centre, using the full available field of view, binning not greater than 2⨉2 and exposure times and high voltage settings suitable for scientific observation, we built a dataset of more than 15000 images. These images were carefully analysed to retrieve information on the average signal and contrast as a function of time and distance between the spacecraft and the Sun. These results show the evolution of the instrument throughput and (part of) performance through the first two years of life. Throughput and contrast appear to reduce over the considered period, with the situation worsening significantly during March 2022 apparently in correspondence with the first perihelion (below 0.35 AU). Besides solar images, UV LED that illuminate it directly (without making use of the optical elements) can also stimulate the camera. We also analyse LED images taken at the beginning of the mission and compare them to a set acquired recently (June 12th 2022) to try to understand whether the problem concerns the camera or the optical elements. This latter analysis is subject to the availability of the recent data and whose downlink time is expected to be of several weeks.
000006312 594__ $$aSTCE
000006312 6531_ $$aSolar Orbiter
000006312 6531_ $$aEUI
000006312 700__ $$aSchühle, U. 
000006312 700__ $$aAznar Cuadrado, R. 
000006312 700__ $$aHeerlein, K. 
000006312 700__ $$aBerghmans, D. 
000006312 700__ $$aAuchère, F. 
000006312 700__ $$aGissot, G.
000006312 700__ $$aKraaikamp, E.
000006312 700__ $$aHarra, L. 
000006312 700__ $$aLong, D. 
000006312 700__ $$aStegen,  K. 
000006312 700__ $$aVerbeeck, C. 
000006312 773__ $$tSolar Orbiter 8, Belfast
000006312 8560_ $$fdavid.berghmans@observatoire.be
000006312 85642 $$ahttps://blogs.qub.ac.uk/so8belfast/
000006312 980__ $$aCPOSTER