@ARTICLE{2021A&A...656A.104C,
       author = {{Chatzistergos}, Theodosios and {Krivova}, Natalie A. and {Ermolli}, Ilaria and {Yeo}, Kok Leng and {Mandal}, Sudip and {Solanki}, Sami K. and {Kopp}, Greg and {Malherbe}, Jean-Marie},
        title = "Reconstructing solar irradiance from historical Ca II K observations. I. Method and its validation",
      journal = {\aap},
         year = 2021,
       volume = {656},
          eid = {A104},
        pages = {A104},
          doi = {10.1051/0004-6361/202141516},
archivePrefix = {arXiv},
       eprint = {2109.05844},
 primaryClass = {astro-ph.SR},
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@ARTICLE{2021A&A...654A..28Y,
       author = {{Yeo}, K.~L. and {Solanki}, S.~K. and {Krivova}, N.~A. and {Jiang}, J.},
        title = "The relationship between bipolar magnetic regions and their sunspots",
      journal = {\aap},
         year = 2021,
       volume = {654},
          eid = {A28},
        pages = {A28},
          doi = {10.1051/0004-6361/202141336},
archivePrefix = {arXiv},
       eprint = {2109.14313},
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@ARTICLE{2021ApJ...914...21S,
       author = {{Sowmya}, K. and {Shapiro}, A.~I. and {Witzke}, V. and {N{\`e}mec}, N. -E. and {Chatzistergos}, T. and {Yeo}, K.~L. and {Krivova}, N.~A. and {Solanki}, S.~K.},
        title = "Modeling Stellar Ca II H and K Emission Variations. I. Effect of Inclination on the S-index",
      journal = {\apj},
         year = 2021,
       volume = {914},
       number = {1},
          eid = {21},
        pages = {21},
          doi = {10.3847/1538-4357/abf247},
archivePrefix = {arXiv},
       eprint = {2103.13893},
 primaryClass = {astro-ph.SR},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2021ApJ...914...21S},
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@INPROCEEDINGS{2021csss.confE.154K,
       author = {{Krishnamurthy}, Sowmya and {Shapiro}, Alexander I. and {Witzke}, Veronika and {N{\`e}mec}, Nina-E. and {Chatzistergos}, Theodosis and {Yeo}, Kok Leng and {Krivova}, Natalie A. and {Solanki}, Sami K.},
        title = "Modelling Solar Ca II H\&K Emission Variations",
    booktitle = {The 20.5th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (CS20.5)},
         year = 2021,
       series = {Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun},
          eid = {154},
        pages = {154},
          doi = {10.5281/zenodo.4564796},
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@INPROCEEDINGS{2020AGUFMA237...10C,
       author = {{Chatzistergos}, T. and {Krivova}, N. and {Ermolli}, I. and {Yeo}, K.~L. and {Solanki}, S.~K. and {Puiu}, C.~C. and {Giorgi}, F. and {Mandal}, S.},
        title = "Reconstructing solar irradiance from Ca II K observations",
    booktitle = {AGU abstracts},
         year = 2020,
       volume = {2020},
          eid = {A237-10},
        pages = {A237-10},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2020AGUFMA237...10C},
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@ARTICLE{2020GeoRL..4790243Y,
       author = {{Yeo}, K.~L. and {Solanki}, S.~K. and {Krivova}, N.~A. and {Rempel}, M. and {Anusha}, L.~S. and {Shapiro}, A.~I. and {Tagirov}, R.~V. and {Witzke}, V.},
        title = "The Dimmest State of the Sun",
      journal = {\grl},
         year = 2020,
       volume = {47},
       number = {19},
          eid = {e90243},
        pages = {e90243},
          doi = {10.1029/2020GL090243},
archivePrefix = {arXiv},
       eprint = {2102.09487},
 primaryClass = {astro-ph.SR},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2020GeoRL..4790243Y},
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@ARTICLE{2020A&A...642C...2Y,
       author = {{Yeo}, K.~L. and {Solanki}, S.~K. and {Krivova}, N.~A.},
        title = "How faculae and network relate to sunspots, and the implications for solar and stellar brightness variations(Corrigendum)",
      journal = {\aap},
         year = 2020,
       volume = {642},
          eid = {C2},
        pages = {C2},
          doi = {10.1051/0004-6361/202037739e},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2020A&A...642C...2Y},
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@ARTICLE{2020A&A...639A.139Y,
       author = {{Yeo}, K.~L. and {Solanki}, S.~K. and {Krivova}, N.~A.},
        title = "How faculae and network relate to sunspots, and the implications for solar and stellar brightness variations",
      journal = {\aap},
         year = 2020,
       volume = {639},
          eid = {A139},
        pages = {A139},
          doi = {10.1051/0004-6361/202037739},
archivePrefix = {arXiv},
       eprint = {2006.14274},
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@ARTICLE{2019A&A...631A.178T,
       author = {{Tagirov}, R.~V. and {Shapiro}, A.~I. and {Krivova}, N.~A. and {Unruh}, Y.~C. and {Yeo}, K.~L. and {Solanki}, S.~K.},
        title = "Readdressing the UV solar variability with SATIRE-S: non-LTE effects",
      journal = {\aap},
         year = 2019,
       volume = {631},
          eid = {A178},
        pages = {A178},
          doi = {10.1051/0004-6361/201935121},
archivePrefix = {arXiv},
       eprint = {1909.11736},
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@ARTICLE{2019A&A...626A.114C,
       author = {{Chatzistergos}, Theodosios and {Ermolli}, Ilaria and {Solanki}, Sami K. and {Krivova}, Natalie A. and {Giorgi}, Fabrizio and {Yeo}, Kok Leng},
        title = "Recovering the unsigned photospheric magnetic field from Ca II K observations",
      journal = {\aap},
         year = 2019,
       volume = {626},
          eid = {A114},
        pages = {A114},
          doi = {10.1051/0004-6361/201935131},
archivePrefix = {arXiv},
       eprint = {1905.03453},
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@ARTICLE{2019A&A...624A.135Y,
       author = {{Yeo}, K.~L. and {Krivova}, N.~A.},
        title = "Intensity contrast of solar network and faculae. II. Implications for solar irradiance modelling",
      journal = {\aap},
         year = 2019,
       volume = {624},
          eid = {A135},
        pages = {A135},
          doi = {10.1051/0004-6361/201935123},
archivePrefix = {arXiv},
       eprint = {2102.09530},
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@ARTICLE{2017PhRvL.119i1102Y,
       author = {{Yeo}, K.~L. and {Solanki}, S.~K. and {Norris}, C.~M. and {Beeck}, B. and {Unruh}, Y.~C. and {Krivova}, N.~A.},
        title = "Solar Irradiance Variability is Caused by the Magnetic Activity on the Solar Surface",
      journal = {\prl},
         year = 2017,
       volume = {119},
        pages = {9.1102},
          doi = {10.1103/PhysRevLett.119.091102},
archivePrefix = {arXiv},
       eprint = {1709.00920},
 primaryClass = {astro-ph.SR},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2017PhRvL.119i1102Y},
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@ARTICLE{2017A&A...605A..45N,
       author = {{Norris}, Charlotte M. and {Beeck}, Benjamin and {Unruh}, Yvonne C. and {Solanki}, Sami K. and {Krivova}, Natalie A. and {Yeo}, Kok Leng},
        title = "Spectral variability of photospheric radiation due to faculae. I. The Sun and Sun-like stars",
      journal = {\aap},
         year = 2017,
       volume = {605},
          eid = {A45},
        pages = {A45},
          doi = {10.1051/0004-6361/201629879},
archivePrefix = {arXiv},
       eprint = {1705.04455},
 primaryClass = {astro-ph.SR},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2017A&A...605A..45N},
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@ARTICLE{2017NatAs...1..612S,
       author = {{Shapiro}, A.~I. and {Solanki}, S.~K. and {Krivova}, N.~A. and {Cameron}, R.~H. and {Yeo}, K.~L. and {Schmutz}, W.~K.},
        title = "The nature of solar brightness variations",
      journal = {Nature Astronomy},
         year = 2017,
       volume = {1},
        pages = {612-616},
          doi = {10.1038/s41550-017-0217-y},
archivePrefix = {arXiv},
       eprint = {1711.04156},
 primaryClass = {astro-ph.SR},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2017NatAs...1..612S},
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@ARTICLE{2017JGRA..122.3888Y,
       author = {{Yeo}, K.~L. and {Krivova}, N.~A. and {Solanki}, S.~K.},
        title = "EMPIRE: A robust empirical reconstruction of solar irradiance variability",
      journal = {Journal of Geophysical Research (Space Physics)},
         year = 2017,
       volume = {122},
       number = {4},
        pages = {3888-3914},
          doi = {10.1002/2016JA023733},
archivePrefix = {arXiv},
       eprint = {1704.07652},
 primaryClass = {astro-ph.SR},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2017JGRA..122.3888Y},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
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@INPROCEEDINGS{2016csss.confE..63N,
       author = {{Norris}, Charlotte M. and {Beeck}, Benjamin and {Unruh}, Yvonne and {Solanki}, Sami and {Yeo}, Kok Leng and {Krivova}, Natalie},
        title = "Modelling the Spectral Contrasts of Stellar Faculae.",
    booktitle = {19th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (CS19)},
         year = 2016,
       series = {Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun},
          eid = {63},
        pages = {63},
          doi = {10.5281/zenodo.57418},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2016csss.confE..63N},
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@ARTICLE{2016A&A...590A..63D,
       author = {{Dasi-Espuig}, M. and {Jiang}, J. and {Krivova}, N.~A. and {Solanki}, S.~K. and {Unruh}, Y.~C. and {Yeo}, K.~L.},
        title = "Reconstruction of spectral solar irradiance since 1700 from simulated magnetograms",
      journal = {\aap},
         year = 2016,
       volume = {590},
          eid = {A63},
        pages = {A63},
          doi = {10.1051/0004-6361/201527993},
archivePrefix = {arXiv},
       eprint = {1605.02039},
 primaryClass = {astro-ph.SR},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2016A&A...590A..63D},
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@ARTICLE{2016A&A...589A..46S,
       author = {{Shapiro}, A.~I. and {Solanki}, S.~K. and {Krivova}, N.~A. and {Yeo}, K.~L. and {Schmutz}, W.~K.},
        title = "Are solar brightness variations faculae- or spot-dominated?",
      journal = {\aap},
         year = 2016,
       volume = {589},
          eid = {A46},
        pages = {A46},
          doi = {10.1051/0004-6361/201527527},
archivePrefix = {arXiv},
       eprint = {1602.04447},
 primaryClass = {astro-ph.SR},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2016A&A...589A..46S},
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@INPROCEEDINGS{2016ASPC..504..273Y,
       author = {{Yeo}, K.~L. and {Shapiro}, A.~I. and {Krivova}, N.~A. and {Solanki}, S.~K.},
        title = "Modelling Solar and Stellar Brightness Variabilities",
    booktitle = {Coimbra Solar Physics Meeting: Ground-based Solar Observations in the Space Instrumentation Era},
         year = 2016,
       editor = {{Dorotovic}, I. and {Fischer}, C.~E. and {Temmer}, M.},
       series = {Astron.\ Soc.\ Pacific Conf.\ Ser.},
       volume = {504},
        pages = {273},
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@ARTICLE{2015JGRA..120.6055Y,
       author = {{Yeo}, K.~L. and {Ball}, W.~T. and {Krivova}, N.~A. and {Solanki}, S.~K. and {Unruh}, Y.~C. and {Morrill}, J.},
        title = "UV solar irradiance in observations and the NRLSSI and SATIRE-S models",
      journal = {Journal of Geophysical Research (Space Physics)},
         year = 2015,
       volume = {120},
       number = {8},
        pages = {6055-6070},
          doi = {10.1002/2015JA021277},
archivePrefix = {arXiv},
       eprint = {1507.01224},
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       adsurl = {https://ui.adsabs.harvard.edu/abs/2015JGRA..120.6055Y},
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@INCOLLECTION{2015sac..book..137Y,
       author = {{Yeo}, K.~L. and {Krivova}, N.~A. and {Solanki}, S.~K.},
        title = "Solar Cycle Variation in Solar Irradiance",
    booktitle = {The Solar Activity Cycle},
         year = 2015,
       editor = {{Balogh}, Andr{\'e} and {Hudson}, Hugh and {Petrovay}, Krist{\'o}f and {von Steiger}, Rudolf},
       volume = {53},
        pages = {137},
          doi = {10.1007/978-1-4939-2584-1\_5},
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@ARTICLE{2014arXiv1412.3935Y,
       author = {{Yeo}, K.~L.},
        title = "Analysis and modeling of solar irradiance variations",
      journal = {arXiv e-prints},
         year = 2014,
          eid = {arXiv:1412.3935},
        pages = {arXiv:1412.3935},
archivePrefix = {arXiv},
       eprint = {1412.3935},
 primaryClass = {astro-ph.SR},
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@ARTICLE{2014SoPh..289.4433T,
       author = {{Thuillier}, G. and {Schmidtke}, G. and {Erhardt}, C. and {Nikutowski}, B. and {Shapiro}, A.~I. and {Bolduc}, C. and {Lean}, J. and {Krivova}, N. and {Charbonneau}, P. and {Cessateur}, G. and {Haberreiter}, M. and {Melo}, S. and {Delouille}, V. and {Mampaey}, B. and {Yeo}, K.~L. and {Schmutz}, W.},
        title = "Solar Spectral Irradiance Variability in November/December 2012: Comparison of Observations by Instruments on the International Space Station and Models",
      journal = {\solphys},
         year = 2014,
       volume = {289},
       number = {12},
        pages = {4433-4452},
          doi = {10.1007/s11207-014-0588-5},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2014SoPh..289.4433T},
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@ARTICLE{2014SSRv..186..137Y,
       author = {{Yeo}, K.~L. and {Krivova}, N.~A. and {Solanki}, S.~K.},
        title = "Solar Cycle Variation in Solar Irradiance",
      journal = {\ssr},
         year = 2014,
       volume = {186},
       number = {1-4},
        pages = {137-167},
          doi = {10.1007/s11214-014-0061-7},
archivePrefix = {arXiv},
       eprint = {1407.4249},
 primaryClass = {astro-ph.SR},
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@ARTICLE{2014A&A...570A..85Y,
       author = {{Yeo}, K.~L. and {Krivova}, N.~A. and {Solanki}, S.~K. and {Glassmeier}, K.~H.},
        title = "Reconstruction of total and spectral solar irradiance from 1974 to 2013 based on KPVT, SoHO/MDI, and SDO/HMI observations",
      journal = {\aap},
         year = 2014,
       volume = {570},
          eid = {A85},
        pages = {A85},
          doi = {10.1051/0004-6361/201423628},
archivePrefix = {arXiv},
       eprint = {1408.1229},
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@PHDTHESIS{2014PhDT........92Y,
       author = {{Yeo}, Kok Leng},
        title = "Analysis and modeling of solar irradiance variations",
       school = {Technical University of Braunschweig, Germany},
         year = 2014,
       adsurl = {https://ui.adsabs.harvard.edu/abs/2014PhDT........92Y},
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@ARTICLE{2014A&A...561A..22Y,
       author = {{Yeo}, K.~L. and {Feller}, A. and {Solanki}, S.~K. and {Couvidat}, S. and {Danilovic}, S. and {Krivova}, N.~A.},
        title = "Point spread function of SDO/HMI and the effects of stray light correction on the apparent properties of solar surface phenomena",
      journal = {\aap},
         year = 2014,
       volume = {561},
          eid = {A22},
        pages = {A22},
          doi = {10.1051/0004-6361/201322502},
archivePrefix = {arXiv},
       eprint = {1310.4972},
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@INPROCEEDINGS{2013EGUGA..1511720C,
       author = {{Cessateur}, Ga{\"e}l and {Shapiro}, Alexander and {Schmutz}, Werner and {Krivova}, Natalie and {Solanki}, Sami K. and {Yeo}, Kok Leng and {Thuillier}, G{\'e}rard},
        title = "What can we learn about the Sun with PREMOS/PICARD?",
    booktitle = {EGU General Assembly Conference Abstracts},
         year = 2013,
       series = {EGU General Assembly Conference Abstracts},
          eid = {EGU2013-11720},
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@ARTICLE{2013A&A...550A..95Y,
       author = {{Yeo}, K.~L. and {Solanki}, S.~K. and {Krivova}, N.~A.},
        title = "Intensity contrast of solar network and faculae",
      journal = {\aap},
         year = 2013,
       volume = {550},
          eid = {A95},
        pages = {A95},
          doi = {10.1051/0004-6361/201220682},
archivePrefix = {arXiv},
       eprint = {1302.1442},
 primaryClass = {astro-ph.SR},
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@INPROCEEDINGS{2012cosp...39..287C,
       author = {{Cessateur}, Ga{\"e}l. and {Kretzschmar}, Matthieu and {Krivova}, Natalie and {Schmutz}, Werner and {Solanki}, Sami K. and {Thuillier}, Gerard and {Shapiro}, Alexander and {Schoell}, Micha and {Shapiro}, Anna and {Dominique}, Marie and {Tagirov}, Rinat and {Wehrli}, Christoph and {Yeo}, Kok Leng},
        title = "Solar Spectral Irradiance as observed by LYRA/PROBA2 and PREMOS/PICARD",
    booktitle = {39th COSPAR Scientific Assembly},
         year = 2012,
       volume = {39},
        pages = {287},
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@INPROCEEDINGS{2012EGUGA..14.8254C,
       author = {{Cessateur}, G. and {Shapiro}, A.~I. and {Dominique}, M. and {Kretzschmar}, M. and {Krivova}, N. and {Shapiro}, A.~V. and {Schmutz}, W. and {Schoell}, M. and {Solanki}, S. and {Tagirov}, R. and {Thuillier}, G. and {Wehrli}, C. and {Yeo}, K.~L.},
        title = "Solar Spectral Irradiance as observed by LYRA/PROBA2 and PREMOS/PICARD",
    booktitle = {EGU General Assembly Conference Abstracts},
         year = 2012,
       series = {EGU General Assembly Conference Abstracts},
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