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Ermolli, I., Matthes, K., Dudok de Wit, T., et al. (2013). Recent variability of the solar spectral
irradiance and its impact on climate modelling. Atmospheric Chemistry and Physics, 13(8),
3945–3977.
Hapgood, M. A. (2011). Towards a scientific understanding of the risk from extreme space weather.
Advances in Space Research, 47(12), 2059–2072. https://doi.org/10.1016/j.asr.2010.02.007.
Hayakawa, H., Ebihara, Y., Willis, D. M., et al. (2018). The great space weather event during
1872 February recorded in East Asia. The Astrophysical Journal, 862(1), 15. https://doi.
org/10.3847/1538- 4357/aaca40.
Hayakawa, H., Ebihara, Y., & Willis, D. M., et al. (2019). Temporal and spatial evolutions of a
Large Sunspot Group and Great Auroral Storms around the Carrington Event in 1859, Space
Weather, 17(11), 1553–1569. https://doi.org/10.1029/2019SW002269
Hodgson, R. (1859). On a curious appearance seen in the Sun. Monthly Notices of the Royal
Astronomical Society, 20, 15–16. https://doi.org/10.1093/mnras/20.1.15.
Kopp, G. (2020). Solar irradiance: Instrument-based advances. In Astronomy in Focus XXX, presented at IAU XXX General Assembly, Vienna, Austria. Proceedings of the IAU, pp. 354–357.
https://doi.org/10.1017/S1743921319004605.
Kopp, G., Pilewskie, P., & Richard, E. (2016). The next spaceflight solar irradiance sensor: TSIS,
American Astronomical Society. SPD meeting #47, id.8.09, https://ui.adsabs.harvard.edu/
abs/2016SPD....47.0809K..
Langley, S. P. (1881). The bolometer and radiant energy. Proceedings of the American Academy of
Arts and Sciences, 16(1881), 342–358. https://doi.org/10.2307/25138616.
Mueller, D., et al. (2020). The Solar Orbiter mission. Science overview. Astronomy and
Astrophysics, 642, A1, 31. https://doi.org/10.1051/0004- 6361/202038467.
Schrijver, C. J., Beer, J., Baltensperger, U., et al. (2012). Estimating the frequency of extremely
energetic solar events, based on solar, stellar, lunar, and terrestrial records. Journal of
Geophysical Research: Space Physics, 117, A8. https://doi.org/10.1029/2012JA017706.
Secchi, A. (1851). Memorie dell’osservatorio del Collegio Romano, 14.
Secchi, A. (1859). Observations des taches et facules du soleil á l’Observatoire du Collège Romain.
Comptes Rendus, 49, 191–194.
Secchi, A. (1860). Memorie dell’osservatorio del Collegio Romano, 2(5).
Secchi, A. (1866). Bollettino meteorologico dell’osservatorio del Collegio Romano, V, Roma 28
febbraio 1866.
Secchi, A. (1871). Atti dell’accademia pontificia de’ Nuovi Lincei, Anno XXIV, Sessione III del 7
maggio 1871.
Solanki, S. K., Inhester, B., & Schuessler, M. (2006). The solar magnetic field. Reports on Progress
in Physics, 69(3), 563–668.
Solanki, S. K., Krivova, N. A., & Haigh, J. D. (2013). Solar irradiance variability and climate.
Annual Review of Astronomy and Astrophysics, 51(1), 311–351.
Zhang, J., Tian, H., Solanki, S. K., et al. (2018). Dark structures in sunspot light bridges. The
Astrophysical Journal, 865(1)., article id. 29, 9 pp.
I. Ermolli and M. Ferrucci
Ermolli, I., Matthes, K., Dudok de Wit, T., et al. (2013). Recent variability of the solar spectral
irradiance and its impact on climate modelling. Atmospheric Chemistry and Physics, 13(8),
3945–3977.
Hapgood, M. A. (2011). Towards a scientific understanding of the risk from extreme space weather.
Advances in Space Research, 47(12), 2059–2072. https://doi.org/10.1016/j.asr.2010.02.007.
Hayakawa, H., Ebihara, Y., Willis, D. M., et al. (2018). The great space weather event during
1872 February recorded in East Asia. The Astrophysical Journal, 862(1), 15. https://doi.
org/10.3847/1538- 4357/aaca40.
Hayakawa, H., Ebihara, Y., & Willis, D. M., et al. (2019). Temporal and spatial evolutions of a
Large Sunspot Group and Great Auroral Storms around the Carrington Event in 1859, Space
Weather, 17(11), 1553–1569. https://doi.org/10.1029/2019SW002269
Hodgson, R. (1859). On a curious appearance seen in the Sun. Monthly Notices of the Royal
Astronomical Society, 20, 15–16. https://doi.org/10.1093/mnras/20.1.15.
Kopp, G. (2020). Solar irradiance: Instrument-based advances. In Astronomy in Focus XXX, presented at IAU XXX General Assembly, Vienna, Austria. Proceedings of the IAU, pp. 354–357.
https://doi.org/10.1017/S1743921319004605.
Kopp, G., Pilewskie, P., & Richard, E. (2016). The next spaceflight solar irradiance sensor: TSIS,
American Astronomical Society. SPD meeting #47, id.8.09, https://ui.adsabs.harvard.edu/
abs/2016SPD....47.0809K..
Langley, S. P. (1881). The bolometer and radiant energy. Proceedings of the American Academy of
Arts and Sciences, 16(1881), 342–358. https://doi.org/10.2307/25138616.
Mueller, D., et al. (2020). The Solar Orbiter mission. Science overview. Astronomy and
Astrophysics, 642, A1, 31. https://doi.org/10.1051/0004- 6361/202038467.
Schrijver, C. J., Beer, J., Baltensperger, U., et al. (2012). Estimating the frequency of extremely
energetic solar events, based on solar, stellar, lunar, and terrestrial records. Journal of
Geophysical Research: Space Physics, 117, A8. https://doi.org/10.1029/2012JA017706.
Secchi, A. (1851). Memorie dell’osservatorio del Collegio Romano, 14.
Secchi, A. (1859). Observations des taches et facules du soleil á l’Observatoire du Collège Romain.
Comptes Rendus, 49, 191–194.
Secchi, A. (1860). Memorie dell’osservatorio del Collegio Romano, 2(5).
Secchi, A. (1866). Bollettino meteorologico dell’osservatorio del Collegio Romano, V, Roma 28
febbraio 1866.
Secchi, A. (1871). Atti dell’accademia pontificia de’ Nuovi Lincei, Anno XXIV, Sessione III del 7
maggio 1871.
Solanki, S. K., Inhester, B., & Schuessler, M. (2006). The solar magnetic field. Reports on Progress
in Physics, 69(3), 563–668.
Solanki, S. K., Krivova, N. A., & Haigh, J. D. (2013). Solar irradiance variability and climate.
Annual Review of Astronomy and Astrophysics, 51(1), 311–351.
Zhang, J., Tian, H., Solanki, S. K., et al. (2018). Dark structures in sunspot light bridges. The
Astrophysical Journal, 865(1)., article id. 29, 9 pp.
I. Ermolli and M. Ferrucci