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Title of Journal: Sol Phys

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Abbravation: Solar Physics

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Springer Netherlands

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DOI

10.1002/chin.200330114

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1573-093X

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Eclipses Observed by Emphasis Type="Italic"Large

Authors: A I Shapiro W Schmutz M Dominique A V Shapiro
Publish Date: 2012/07/31
Volume: 286, Issue: 1, Pages: 271-287
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Abstract

We analyze the light curves of the recent solar eclipses measured by the Herzberg channel 200 – 220 nm of the Large Yield RAdiometer LYRA onboard Project for OnBoard Autonomy PROBA2 The measurements allow us to accurately retrieve the centertolimb variations CLV of the solar brightness The formation height of the radiation depends on the observing angle so the examination of the CLV provide information about a broad range of heights in the solar atmosphere We employ the 1D NLTE radiative transfer COde for Solar Irradiance COSI to model the measured light curves and corresponding CLV dependencies The modeling is used to test and constrain the existing 1D models of the solar atmosphere eg the temperature structure of the photosphere and the treatment of the pseudocontinuum opacities in the Herzberg continuum range We show that COSI can accurately reproduce not only the irradiance from the entire solar disk but also the measured CLV Hence it can be used as a reliable tool for modeling the variability of the spectral solar irradianceThe research leading to this article was supported by the Swiss National Science Foundation under grant CRSI122130642 FUPSOL and grant 200020130102 We thank the PROBA2/LYRA science team for their work in producing the data sets used in this article and their helpful recommendations LYRA is a project of the Centre Spatial de Liège the PhysikalischMeteorologisches Observatorium Davos and the Royal Observatory of Belgium funded by the Belgian Federal Science Policy Office BELSPO and by the Swiss Bundesamt für Bildung und Wissenschaft PROBA2 is an ESA micro satellite operated by the Director for Science and Robotic Exploration


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Other Papers In This Journal:

  1. Coronal Mass Ejections from the Same Active Region Cluster: Two Different Perspectives
  2. Gnevyshev Peaks in the CME Average Speeds in Cycle 23
  3. Mapping Solar Wind Streams from the Sun to 1 AU: A Comparison of Techniques
  4. Non-reflective Propagation of Kink Waves in Coronal Magnetic Loops
  5. High-Energy Emission from a Solar Flare in Hard X-rays and Microwaves
  6. Estimating Electric Current Densities in Solar Active Regions
  7. Total Solar Irradiance Measurement and Modelling during Cycle 23
  8. Reduced Coronal Emission Above Large Isolated Sunspots
  9. Observational Signatures of Impulsively Heated Coronal Loops: Power-Law Distribution of Energies
  10. Transition of the Sunspot Number from Zurich to Brussels in 1980: A Personal Perspective
  11. Very High-Resolution Solar X-Ray Imaging Using Diffractive Optics
  12. Tracking of Coronal White-Light Events by Texture
  13. An Interpretation of a Possible Mechanism for the First Ground-Level Enhancement of Solar Cycle 24
  14. Velocities and Temperatures of an Ellerman Bomb and Its Associated Features
  15. Kink Wave Propagation in Thin Isothermal Magnetic Flux Tubes
  16. Ensemble Modeling of CMEs Using the WSA–ENLIL+Cone Model
  17. A Simple Way to Estimate the Soft X-ray Class of Far-Side Solar Flares Observed with STEREO/EUVI
  18. Multi-spacecraft Observations of CIR-Associated Ion Increases During the Ulysses 2007 Ecliptic Crossing
  19. Numerical Simulation of a Solar Active Region. I: Bastille Day Flare
  20. Magnetic Topology of Active Regions and Coronal Holes: Implications for Coronal Outflows and the Solar Wind
  21. Variations in Ratio and Correlation of Solar Magnetic Fields in the Fe i 525.02 nm and Na i 589.59 nm Lines According to Mount Wilson Measurements During 2000 – 2012
  22. Oscillations in Solar Faculae. III. The Phase Relations Between Chromospheric and Photospheric Line-of-Sight Velocities
  23. A Search for Helioseismic Signature of Emerging Active Regions
  24. Subsecond (0.1 s) Pulsations in the 11 April 2001 Radio Event
  25. Global Heliospheric Parameters and Cosmic-Ray Modulation: An Empirical Relation for the Last Decades
  26. Modeling of EIS Spectrum Drift from Instrumental Temperatures
  27. Preface
  28. Emission of Type II Radio Bursts – Single-Beam Versus Two-Beam Scenario
  29. Historical Heliophysical Series of the Ebro Observatory
  30. Dynamics of an Erupting Arched Magnetic Flux Rope in a Laboratory Plasma Experiment
  31. The Self-Inversion of the Sign of Circular Polarization in “Halo” Microwave Sources
  32. Recent Developments of NEMO: Detection of EUV Wave Characteristics
  33. Design and Ground Calibration of the Helioseismic and Magnetic Imager (HMI) Instrument on the Solar Dynamics Observatory (SDO)
  34. Preface
  35. Evidence that Synchrotron Emission from Nonthermal Electrons Produces the Increasing Submillimeter Spectral Component in Solar Flares

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