LYRA

Lyman Alpha Radiometer
Alternative names	LYRA
Part of	PROBA-2
Organization	European Space Agency
Telescope style	radiometer; space instrument
	[edit on Wikidata]

LYRA(Lyman Alpha Radiometer) is the solar UV radiometer on boardProba-2,aEuropean Space Agencytechnology demonstration satellite that was launched on November 2, 2009.^[1]

LYRA^[2]^[3]has been designed and manufactured by a Belgian-Swiss-German consortium (ROB-SIDC,PMOD/WRC,IMOMEC, CSL, MPS and BISA) with additional international collaborations (Japan, USA, Russia, and France). Jean-François Hochedez (ROB) is Principal Investigator, Yves Stockman (CSL) is Project Manager, and Werner Schmutz (PMOD) is Lead co-Investigator.

LYRA will monitor theSolar irradiancein four UV passbands. They have been chosen for their relevance to solar physics, aeronomy and Space Weather:

the 115-125 nmLyman-αchannel,
the 200-220 nmHerzbergcontinuum channel,
theAluminium filter channel(17-50 nm) including He II at 30.4 nm, and
theZirconium filter channel(1-20 nm).

TheRadiometric calibrationof the instrument is traceable toSynchrotronsource standards,Physikalisch-Technische Bundesanstalt(PTB) andNational Institute of Standards and Technology(NIST).^[4]Its stability will be monitored by onboard calibration light sources (light-emitting diodes), which allow distinguishing between potential degradations of the detectors and filters. Additionally, a redundancy strategy contributes to the accuracy and the stability of the measurements. LYRA will benefit from wide bandgap detectors based on diamond: it will be the first space assessment ofa pioneering UV detectors program.Diamond sensors make the instruments radiation-hard andsolar-blind:their high bandgap energy makes them quasi-insensitive to visible light (see also references inMarchywka Effect). TheSWAPextreme ultraviolet (EUV) imaging telescope will operate next to LYRA on Proba-2. Together, they will establish a high performance solar monitor for operational space weather nowcasting and research. LYRA demonstrates technologies important for future missions such as the ESASolar Orbitermission.

References[edit]

^Successful launch qualification test for Proba-2 Archived2011-07-25 at theWayback Machine
^Hochedez, J; Schmutz, W; Stockman, Y; Schuhle, U; Benmoussa, A; Koller, S; Haenen, K; Berghmans, D; Defise, J; Halain, J.-P.; Theissen, A.; Delouille, V.; Slemzin, V.; Gillotay, D.; Fussen, D.; Dominique, M.; Vanhellemont, F.; McMullin, D.; Kretzschmar, M.; Mitrofanov, A.; Nicula, B.; Wauters, L.; Roth, H.; Rozanov, E.; Rüedi, I.; Wehrli, C.; Soltani, A.; Amano, H.; Van Der Linden, R.; et al. (2006), "LYRA, a solar UV radiometer on Proba2",Advances in Space Research,37(2): 303,Bibcode:2006AdSpR..37..303H,doi:10.1016/j.asr.2005.10.041,hdl:1942/933
^LYRA websiteProba-2 Science Center
^LYRA, A SOLAR UV RADIOMETER ON PROBA2

[1] Successful launch qualification test for Proba-2 Archived2011-07-25 at theWayback Machine

[hochedez2006-2] Hochedez, J; Schmutz, W; Stockman, Y; Schuhle, U; Benmoussa, A; Koller, S; Haenen, K; Berghmans, D; Defise, J; Halain, J.-P.; Theissen, A.; Delouille, V.; Slemzin, V.; Gillotay, D.; Fussen, D.; Dominique, M.; Vanhellemont, F.; McMullin, D.; Kretzschmar, M.; Mitrofanov, A.; Nicula, B.; Wauters, L.; Roth, H.; Rozanov, E.; Rüedi, I.; Wehrli, C.; Soltani, A.; Amano, H.; Van Der Linden, R.; et al. (2006), "LYRA, a solar UV radiometer on Proba2",Advances in Space Research,37(2): 303,Bibcode:2006AdSpR..37..303H,doi:10.1016/j.asr.2005.10.041,hdl:1942/933

[lyra_web-3] LYRA websiteProba-2 Science Center

[4] LYRA, A SOLAR UV RADIOMETER ON PROBA2

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