Measurements of spectral irradiance during the solar eclipse of 21 August 2017: reassessment of the effect of solar limb darkening and of changes in total ozone

Bernhard, Germar; Petkov, Boyan

doi:10.5194/acp-19-4703-2019

Articles | Volume 19, issue 7

https://doi.org/10.5194/acp-19-4703-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-19-4703-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 19, issue 7

Research article

|

09 Apr 2019

Research article |

| 09 Apr 2019

Measurements of spectral irradiance during the solar eclipse of 21 August 2017: reassessment of the effect of solar limb darkening and of changes in total ozone

Germar Bernhard and Boyan Petkov

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Jan 2019	35	5	0	40
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Mar 2019	35	11	0	46
Apr 2019	175	43	4	222
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Sep 2019	3	6	0	9
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Jul 2024	61	16	4	81
Aug 2024	41	13	3	57
Sep 2024	30	17	0	47
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Nov 2024	13	4	1	18
Dec 2024	19	3	1	23
Jan 2025	23	4	0	27
Feb 2025	35	23	0	58
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Apr 2025	24	14	0	38
May 2025	24	6	2	32
Jun 2025	62	15	1	78
Jul 2025	33	17	1	51
Aug 2025	55	24	3	82
Sep 2025	74	23	0	97
Oct 2025	24	19	0	43
Nov 2025	49	31	5	85
Dec 2025	74	60	1	135
Jan 2026	69	35	7	111
Feb 2026	86	20	3	109
Mar 2026	66	29	3	98
Apr 2026	76	63	5	144

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Short summary

Solar radiation at ultraviolet, visible, and infrared wavelengths was measured during the total solar eclipse of 21 August 2017. Data were used to study the wavelength-dependent changes of solar radiation at Earth’s surface and to validate parameterizations of solar limb darkening (LD), which describes the change in the Sun’s brightness between its center and its edge. The study highlights the importance of the LD effect when calculating total ozone and aerosol optical depth during an eclipse.