LYRA

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title: "LYRA" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["european-space-agency", "spacecraft-instruments", "radiometry"] topic_path: "general/european-space-agency" source: "https://en.wikipedia.org/wiki/LYRA" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

LYRA (Lyman Alpha Radiometer) is the solar UV radiometer on board Proba-2, a European Space Agency technology demonstration satellite that was launched on November 2, 2009.

LYRA{{citation | last = Hochedez | year = 2006 | title = LYRA, a solar UV radiometer on Proba2 | journal = Advances in Space Research | volume = 37 | pages = 303 | doi = 10.1016/j.asr.2005.10.041 | first1 = J | last2 = Schmutz | first2 = W | last3 = Stockman | first3 = Y | last4 = Schuhle | first4 = U | last5 = Benmoussa | first5 = A | last6 = Koller | first6 = S | last7 = Haenen | first7 = K | last8 = Berghmans | first8 = D | last9 = Defise | first9 = J | bibcode=2006AdSpR..37..303H | issue = 2 | last10 = Halain | first10 = J.-P. | last11 = Theissen | first11 = A. | last12 = Delouille | first12 = V. | last13 = Slemzin | first13 = V. | last14 = Gillotay | first14 = D. | last15 = Fussen | first15 = D. | last16 = Dominique | first16 = M. | last17 = Vanhellemont | first17 = F. | last18 = McMullin | first18 = D. | last19 = Kretzschmar | first19 = M. | last20 = Mitrofanov | first20 = A. | last21 = Nicula | first21 = B. | last22 = Wauters | first22 = L. | last23 = Roth | first23 = H. | last24 = Rozanov | first24 = E. | last25 = Rüedi | first25 = I. | last26 = Wehrli | first26 = C. | last27 = Soltani | first27 = A. | last28 = Amano | first28 = H. | last29 = Van Der Linden | first29 = R. | last30 = Zhukov | first30 = A. | display-authors = 29 | hdl = 1942/933 | hdl-access = free

LYRA will monitor the Solar irradiance in four UV passbands. They have been chosen for their relevance to solar physics, aeronomy and Space Weather:

  1. the 115-125 nm Lyman-α channel,
  2. the 200-220 nm Herzberg continuum channel,
  3. the Aluminium filter channel (17-50 nm) including He II at 30.4 nm, and
  4. the Zirconium filter channel (1-20 nm). The Radiometric calibration of the instrument is traceable to Synchrotron source standards, Physikalisch-Technische Bundesanstalt (PTB) and National Institute of Standards and Technology (NIST). 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 of a pioneering UV detectors program. Diamond sensors make the instruments radiation-hard and solar-blind: their high bandgap energy makes them quasi-insensitive to visible light (see also references in Marchywka Effect). The SWAP extreme 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 ESA Solar Orbiter mission.

References

References

  1. [http://news.eoportal.org/didyouknow/080923_did1.html Successful launch qualification test for Proba-2] {{webarchive. link. (2011-07-25)
  2. [http://proba2.sidc.be/data/LYRA LYRA website] Proba-2 Science Center
  3. [http://sci.esa.int/proba2/48471-hochedez-j-f-2006/ LYRA, A SOLAR UV RADIOMETER ON PROBA2]

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european-space-agencyspacecraft-instrumentsradiometry