LYRA the LargeYield Radiometer onboard PROBA 2 LYRA
LYRA the Large-Yield Radiometer onboard PROBA 2 LYRA data: getting them and exploiting them I. E. Dammasch, M. Dominique & the LYRA Team SOTERIA Capacity Building Workshop ROB, Brussels, 15 -16 Feb 2011
LYRA: the Large-Yield RAdiometer n 3 instrument units (redundancy) n 4 spectral channels per head n 3 types of detectors, Silicon + 2 types of diamond detectors (MSM, PIN): - radiation resistant - insensitive to visible light compared to Si detectors n High cadence up to 100 Hz
LYRA highlights • Royal Observatory of Belgium (Brussels, B) Principal Investigator, overall design, onboard software specification, science operations • PMOD/WRC (Davos, CH) Lead Co-Investigator, overall design and manufacturing • Centre Spatial de Liège (B) Lead institute, project management, filters • IMOMEC (Hasselt, B) Diamond detectors • Max-Planck-Institut für Sonnensystemforschung (Lindau, D) calibration • science Co-Is: BISA (Brussels, B), LPC 2 E (Orléans, F)…
LYRA highlights q 4 spectral channels covering a wide emission temperature range q Redundancy (3 units) gathering three types of detectors q q q Rad-hard, solar-blind diamond UV sensors (PIN and MSM) AXUV Si photodiodes Ly Hz Al Zr Unit 1 MSM PIN MSM Si Unit 2 MSM PIN MSM Unit 3 Si PIN Si Si 2 calibration LEDs per detector (λ = 465 nm and 390 nm) High cadence (up to 100 Hz) Quasi-continuous acquisition during mission lifetime
SWAP and LYRA spectral intervals for solar flares, space weather, and aeronomy LYRA channel 1: the H I 121. 6 nm Lyman-alpha line (120 -123 nm) LYRA channel 2: the 200 -220 nm Herzberg continuum range (now 190 -222 nm) LYRA channel 3: the 17 -80 nm Aluminium filter range incl the He II 30. 4 nm line (+ <5 nm X-ray) LYRA channel 4: the 6 -20 nm Zirconium filter range with highest solar variablility (+ <2 nm X-ray) SWAP: the range around 17. 4 nm including coronal lines like Fe IX and Fe X
LYRA pre-flight spectral responsivity (filter + detector, twelve combinations)
LYRA data products and manuals… …available at the PROBA 2 Science Center: http: //proba 2. sidc. be/
Lev 1 met FITS file typically 124 KB/day
Lev 1 std FITS file typically 67 MB/day at 50 ms resolution or >300 MB at 10 ms resolution
Level 1 FITS, metadata and standard
Lev 2 std FITS file typically 75 MB/day at 50 ms resolution or 370 MB/day at 10 ms reolution
Lev 3 std FITS file typically 62 KB /day 1 -minute resolution
Level 2 FITS and Level 3 FITS, standard
Summary: FITS File Structure n n n n n lyra_20100609_000000_lev 1_***. fits where: *** = met, std, cal, rej, (bst, bca, bre) generally: header + binary extension table(s) extension = header + data (variable length) Lev 1 met = HK, STATUS, VFC Lev 1 std = uncalibr. irradiance (counts/ms) Lev 2 std = calibr. irradiance (W/m²) Lev 3 std = calibr. aver. irradiance (W/m²) per line: time, ch 1, ch 2, ch 3, ch 4, qual.
Product Definition n Level 1 = full raw data (LY-EDG output) n Level 2 = calibrated physical data (LY-BSDG output) Caution: preliminary status. Require versioning. n Level 3 = processed products (e. g. averages) n Level 4 = plots of products n Level 5 = event lists (optionally with plots)
Further Data Products… …“Level 4”, “Level 5” (still preliminary):
Level 4 (cal. )
LYRA Daily Image (calibrated)
State of the data processing pipeline Telemetry packets LY-TMR: Current state In the future Not distributed “Lev 0”: Raw data (in counts) LY-EDG fits After each contact Lev 1: Engineering data (in k. Hz) LY-BSDG fits Testing After each contact Lev 2, Lev 3: Calibrated data (in W/m²) Other tools Higher level data products Plots + flare list available irregular systematic
- Slides: 23