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Detection of Solar Rotational Variability in the Large Yield RAdiometer (LYRA) 190 – 222 nm Spectral Band

  • PROBA2 – FIRST TWO YEARS OF SOLAR OBSERVATION
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Abstract

We analyze the variability of the spectral solar irradiance during the period from 7 January 2010 until 20 January 2010 as measured by the Herzberg channel (190 – 222 nm) of the Large Yield RAdiometer (LYRA) onboard PROBA2. In this period of time, observations by the LYRA nominal unit experienced degradation and the signal produced by the Herzberg channel frequently jumped from one level to another. Both factors significantly complicate the analysis. We present the algorithm that allowed us to extract the solar variability from the LYRA data and compare the results with SORCE/SOLSTICE measurements and with modeling based on the Code for the Solar Irradiance (COSI).

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Acknowledgements

The research leading to this article was supported by the Swiss National Science Foundation under grant CRSI122-130642 (FUPSOL) and grant 200020-130102. We thank the PROBA2/LYRA science team for their work in producing the data sets used in this article and their helpful recommendations. We also thank the PSPT team for providing us with the filling factors of the active components of the solar atmosphere. We thank Stephanie Ebert for her help and advice in editing the figures.

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Correspondence to A. V. Shapiro.

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PROBA2 – First Two Years of Solar Observation

Guest Editors: David Berghmans, Anik De Groof, Marie Dominique, and Jean-François Hochedez

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Shapiro, A.V., Shapiro, A.I., Dominique, M. et al. Detection of Solar Rotational Variability in the Large Yield RAdiometer (LYRA) 190 – 222 nm Spectral Band. Sol Phys 286, 289–301 (2013). https://doi.org/10.1007/s11207-012-0029-2

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