Correlation between sunspot numbers and EUV irradiance as observed by LYRA on PROBA2
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Transcript of Correlation between sunspot numbers and EUV irradiance as observed by LYRA on PROBA2
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Correlation between sunspot numbers and EUV irradiance
as observed by LYRA on PROBA2
Ingolf. E. Dammasch & Laure Lefevre, ROB
SIDC Seminar, Brussels, 10 Jul 2013
LYRAthe Large-Yield Radiometer onboard PROBA2
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PROBA2
ESA’s “PRoject for On-Board Autonomy” Belgian microsatellite in Sun-synchronous orbit 725 km altitude Launched 02 Nov 2009 Nominal operations since March 2010 Technology and science mission 4 innovative instruments and 17 technological
experiments for in-orbit demonstration Among them the EUV imager SWAP and the
radiometer LYRA
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LYRA
“Large-Yield RAdiometer” 3 instrument units (redundancy) 4 spectral channels per head 3 types of detectors, Silicon + 2 types of diamond
detectors (MSM, PIN): radiation resistant, insensitive to visible light as compared to Si detectors
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LYRA Channels
Redundancy with different types of detectors: Channel 1 (Lyman-alpha) 120-123nm Channel 2 (Herzberg) 190-222nm Channel 3 (Aluminium) 17-80nm + <5nm Channel 4 (Zirconium) 6-20nm + <2nm
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Instrument Artefacts
Data gaps Satellite rotations Occultations by Earth atmosphere Off-pointings Temperature variations Switch on/off
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GOES vs. LYRA Proxies
Manually select significant minimum per day Calculate proxy with simple linear formula
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3 ½ Years of Solar Development
(initially a by-product of the daily significant minimum)
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… also observed by SWAP and SDO/EVE
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Another Instrument Artefact
Spectral degradation (drastic above 19nm): Channel 2-3 lost 93% of its initial response Channel 2-4 lost 44% of its initial response
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Comparing
LYRA channel 2-3 LYRA channel 2-4 GOES 0.1-0.8nm Daily sunspot number
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Comparing
LYRA channel 2-3 LYRA channel 2-4 GOES 0.1-0.8nm Daily sunspot number
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Comparing
Another idea: Compare these… LYRA channel 2-3 LYRA channel 2-4 GOES 0.1-0.8nm Daily sunspot number … to flare indices
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Comparing
Example: Maximum flare
strength and … LYRA channel 2-3 LYRA channel 2-4 GOES 0.1-0.8nm Daily sunspot number
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…now for Laure’s part…
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DATA U
SED GOES F10.7 (Penticton) CaIIK (SFO) Lyra4 Lyra3 TSI (Virgo / PMOD) Facular Area (SFO) Sunspot Area (SFO) Sunspot Numbers (from
SIDC)
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Cross Correlations ISSN VS. all
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Cross correlation Lyra3 vs. ISSN
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Cross correlation Lyra4 vs. ISSN
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Similarity map
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Theoretical temperature
components of Lyra
channels 3 and 4
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WHERE DOES WHAT COME FROM ?
Vernazza et al., 1981
CORONA
CHROMOSPHERE PHOTOSPHERELyra 4 Lyra
3
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Now what does this mean ?
GOES F10.7
HeI CaIIK MgII Lyman α
TSI Facular Area Sunspot Area
CORONATRANS.
CHROM.
PHOTOS.
Soft X-rays
EUV
Visible
Dudok de Wit, T. (2007)
Lyra 4 ?Lyra 3 ?
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Shorter timescales (< 81 days)
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TIME
2010
2011
2012-2013
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Longer timescales (> 81 days)
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Now
what about the
long-term evolution
of the instrument ?
TIME
2010
2011
2012-2013
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THE BEGINNING
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TIME
2010
2011
2012-2013
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n : number of variablesm : time length
gives n different axesS gives the amount of variance
F107
Coordinates of F107 on all n axes
R i
Singular Value Decomposition : How does it work ?