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EUV Irradiance Reconstruction in view of PROBA2

Margit Haberreiter, PMOD/WRC, Davos, Switzerland Cis Verbeeck, Veronique Delouille, Rami Qahwaji. EUV Irradiance Reconstruction in view of PROBA2. O. Absorption of EUV in the Earth‘s atmosphere. Altitude-wavelength dependence of energy deposition from solar irradiance

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EUV Irradiance Reconstruction in view of PROBA2

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  1. Margit Haberreiter, PMOD/WRC, Davos, Switzerland Cis Verbeeck, Veronique Delouille, Rami Qahwaji EUV Irradiance Reconstruction in view of PROBA2 ESWW9, Brussels, Nov 4-7 2012 Margit Haberreiter

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  3. Absorption of EUV in the Earth‘s atmosphere Altitude-wavelength dependence of energy deposition from solar irradiance units of Log10(Wm-4) From Solomon and Qian 2005 Solar minimum conditions EUV varies by a factor of 2 and more!!

  4. ESWW9, Brussels, Nov 4-7 2012 Margit Haberreiter Global Mean Neutral Density vs F10.7 Long-term variation due to solar forcing (here F10.7) Short-term variations visible in geomagnetic variations (Ap index)

  5. ESWW9, Brussels, Nov 4-7 2012 Margit Haberreiter Neutral Density versus EUV irradiance

  6. Modeling the Solar EUV Spectrum • Wavelengths • UV: 120 – 400 nm • EUV: 10 – 120 nm • Contribution from the • Chromophere • Transition region • Corona

  7. EUV reconstruction - Semi-empirical modeling ESWW9, Brussels, Nov 4-7 2012 Margit Haberreiter Iterative process nlevel, nel,nion,… (x,y,z,t) I(λ,μ,φ,t) I(λ,μ,φ,t)

  8. ESWW9, Brussels, Nov 4-7 2012 Margit Haberreiter Comparison to SDO/EVE observations Haberreiter, 2011, Solar Physics, 274, 473

  9. ESWW9, Brussels, Nov 4-7 2012 Margit Haberreiter Synthetic EUV Spectra Quiet Corona Quiet Coronal Network Active Coronal Network Hot loops Super hot loops

  10. ESWW9, Brussels, Nov 4-7 2012 Margit Haberreiter EIT Image Decomposition June 1, 2003 Coronal Hole Mask Active Region Mask SPoCA Image Decomposition: Cis Verbeeck, ROB

  11. ESWW9, Brussels, Nov 4-7 2012 Margit Haberreiter Area coverage over solar cycle 23 Barra et al., 2009, A&A Data from Barra et al, 2009

  12. ESWW9, Brussels, Nov 4-7 2012 Margit Haberreiter Reconstruction of the EUV for solar cycle 23 Haberreiter, 2012, IAU Symposium 286

  13. ESWW9, Brussels, Nov 4-7 2012 Margit Haberreiter SWAP integrated intensities • Mean of off-limb contribution:  35%

  14. ESWW9, Brussels, Nov 4-7 2012 Margit Haberreiter Reconstruction of the EUV for solar cycle 23

  15. ESWW9, Brussels, Nov 4-7 2012 Margit Haberreiter FP7 Space Project SOLID • SOLID: First European Comprehensive SOLar Irradiance Data exploitation • Coordinator PMOD/WRC (W. Schmutz, Project Manager: M. Haberreiter) • Start: December 2012 • 10 Partners from 7 European Countries (CH, F, B, UK, D, EL, I) • Compilation and Analysis of the existing irradiance observations from the XUV/EUV, UV, visible to the IR along with the state-of-the-art irradiance modelling results Poster 3.1 Haberreiter et. al

  16. ESWW9, Brussels, Nov 4-7 2012 Margit Haberreiter Conclusion • Understanding the physical mechanisms that drive solar spectral irradiance variations is important for Space Weather studies • Successful reconstruction based on EIT image analysis • Improvement of implementation of extended corona • Extend the reconstruction to PROBA2 time series based on SWAP decomposition • More to come soon within the FP7 SOLID project

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