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EUV Irradiance Reconstruction in view of PROBA2

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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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margit haberreiter pmod wrc davos switzerland cis verbeeck veronique delouille rami qahwaji
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

absorption of euv in the earth s atmosphere
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!!

global mean neutral density vs f10 7
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)

modeling the solar euv spectrum
Modeling the Solar EUV Spectrum
  • Wavelengths
    • UV: 120 – 400 nm
    • EUV: 10 – 120 nm
  • Contribution from the
    • Chromophere
    • Transition region
    • Corona
iterative process

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)

comparison to sdo eve observations
ESWW9, Brussels, Nov 4-7 2012 Margit Haberreiter Comparison to SDO/EVE observations

Haberreiter, 2011, Solar Physics, 274, 473

synthetic euv spectra
ESWW9, Brussels, Nov 4-7 2012 Margit Haberreiter Synthetic EUV Spectra

Quiet Corona

Quiet Coronal Network

Active Coronal Network

Hot loops

Super hot loops

eit image decomposition
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

area coverage over solar cycle 23
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

swap integrated intensities
ESWW9, Brussels, Nov 4-7 2012 Margit Haberreiter SWAP integrated intensities
  • Mean of off-limb contribution:  35%
fp7 space project solid
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

conclusion
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