Articles | Volume 17, issue 2
Research article
 | Highlight paper
30 Apr 2021
Research article | Highlight paper |  | 30 Apr 2021

On the phenomenon of the blue sun

Nellie Wullenweber, Anna Lange, Alexei Rozanov, and Christian von Savigny

Related authors

TOLNet validation of satellite ozone profiles in the troposphere: impact of retrieval wavelengths
Matthew S. Johnson, Alexei Rozanov, Mark Weber, Nora Mettig, John Sullivan, Michael J. Newchurch, Shi Kuang, Thierry Leblanc, Fernando Chouza, Timothy A. Berkoff, Guillaume Gronoff, Kevin B. Strawbridge, Raul J. Alvarez, Andrew O. Langford, Christoph J. Senff, Guillaume Kirgis, Brandi McCarty, and Larry Twigg
Atmos. Meas. Tech., 17, 2559–2582,,, 2024
Short summary
Tropospheric ozone column dataset from OMPS-LP/OMPS-NM limb–nadir matching
Andrea Orfanoz-Cheuquelaf, Carlo Arosio, Alexei Rozanov, Mark Weber, Annette Ladstätter-Weißenmayer, John P. Burrows, Anne M. Thompson, Ryan M. Stauffer, and Debra E. Kollonige
Atmos. Meas. Tech., 17, 1791–1809,,, 2024
Short summary
Explaining the green volcanic sunsets after the 1883 eruption of Krakatoa
Christian von Savigny, Anna Lange, Christoph G. Hoffmann, and Alexei Rozanov
Atmos. Chem. Phys., 24, 2415–2422,,, 2024
Short summary
Retrieval of stratospheric aerosol extinction coefficients from OMPS-LP measurements
Alexei Rozanov, Christine Pohl, Carlo Arosio, Adam Bourassa, Klaus Bramstedt, Elizaveta Malinina, Landon Rieger, and John P. Burrows
EGUsphere,,, 2024
Short summary
Relations between cyclones and ozone changes in the Arctic using data from satellite instruments and the MOSAiC ship campaign
Falco Monsees, Alexei Rozanov, John P. Burrows, Mark Weber, Annette Rinke, Ralf Jaiser, and Peter von der Gathen
EGUsphere,,, 2024
Short summary

Related subject area

Subject: Feedback and Forcing | Archive: Modelling only | Timescale: Decadal-Seasonal
Assessing the impact of large volcanic eruptions of the last millennium (850–1850 CE) on Australian rainfall regimes
Stephanie A. P. Blake, Sophie C. Lewis, Allegra N. LeGrande, and Ron L. Miller
Clim. Past, 14, 811–824,,, 2018
Short summary
10Be in late deglacial climate simulated by ECHAM5-HAM – Part 2: Isolating the solar signal from 10Be deposition
U. Heikkilä, X. Shi, S. J. Phipps, and A. M. Smith
Clim. Past, 10, 687–696,,, 2014

Cited articles

Ångström, A.: The Blue Sun of September 1950, Tellus, 3, 135–140,, 1951. a
Ball, J. G. C., Reed, B. E., Grainger, R. G., Peters, D. M., Mather, T. A., and Pyle, D. M.: Measurements of the complex refractive index of volcanic ash at 450, 546.7, and 650 nm, J. Geophys. Res.-Atmos., 120, 7747–7757,, 2015. a
Bates, D. R.: Rayleigh scattering by air, Planet. Space Sci., 32, 785–790,, 1984. a
Bauch, M.: The Day the Sun Turned Blue: A Volcanic Eruption in the Early 1460s and Its Possible Climatic Impact – A Natural Disaster Perceived Globally in the Late Middle Ages?, in: Historical Disaster Experiences. Transcultural Research – Heidelberg Studies on Asia and Europe in a Global Context, edited by: Schenk, G. J., Springer, Cham, 107–138, 2017. a
Bergstrom, R. W., Pilewskie, P., Russell, P. B., Redemann, J., Bond, T. C., Quinn, P. K., and Sierau, B.: Spectral absorption properties of atmospheric aerosols, Atmos. Chem. Phys., 7, 5937–5943,, 2007. a, b, c, d, e
Short summary
This study investigates the physical processes leading to the rare phenomenon of the sun appearing blue or green. The phenomenon is caused by anomalous scattering by, e.g., volcanic or forest fire aerosols. Unlike most other studies, our study includes a full treatment of the effect of Rayleigh scattering on the colour of the sun. We investigate different factors and revisit a historic example, i.e. the Canadian forest fires in 1950, that led to blue sun events in different European countries.