In this study, we have for the first time discussed the effect of a partial solar eclipse on limb-darkening effect, incoming solar radiation and atmospheric temperature at the surface with the help of a solar telescope with the back-end instrument as the charge-coupled device camera and data of net radiometer installed at the Department of Physics, Banaras Hindu University, Varanasi, India. We have also calculated the eclipse parameters, magnitude and obscuration. A partial eclipse occurred at Varanasi on 21 June 2020 from 10:30:51 am to 02:04:01 pm (IST) for 3 h 33 min. The path of this rare solstice ring of fire was of long duration. Observation of six phases of the partial solar eclipse was recorded and it showed a variation in the intensity over the sun’s diameter from one limb to another at different phases of the eclipse. We also estimated the limb-darkening coefficient for six phases of the partial solar eclipse. The average value of the solar limb-darkening coefficient was found to be about 0.61. The observed values of the limb-darkening coefficient; incoming solar radiation and atmospheric temperature at the surface are consistent with earlier studies.
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Anderson J 1999 Meteorological changes during a solar eclipse; Weather 54(7) 207–215.
Anderson R C, Keefer D R and Myers O E 1972 Atmospheric pressure and temperature changes during the 7 March 1970 solar eclipse; J. Atmos. Sci. 29 583–587.
Anon 1834 Meteorological observations during the solar eclipse of 30th November 1834, at Boston, Mass.; Boston Med. Surg. J., American Periodicals Series II, Boston 11 295–296.
Antonia R A, Chambers A J, Phong-Anant D, Rajagopalan S and Sreenivasan K R 1979 Response of atmospheric surface layer turbulence to a partial solar eclipse; J. Geophys. Res. 4 1689–1692.
Aplin K L and Harrison R G 2003 Meteorological effects of the eclipse of 11 August 1999 in cloudy and clear conditions; Proc. Roy. Soc. London Ser. A 459 353–371.
Aplin K L, Scott C J and Gray L 2016 Atmospheric change from solar eclipses; Philos. Trans. Roy. Soc. A 374 20150217, https://doi.org/10.1098/rsta.2015.0217.
Bernhard G and Petkov B 2019 Measurements of spectral irradiance during the solar eclipse of 21 August 2017: Reassessment of the effect of solar limb darkening and changes in total ozone; Atmos. Chem. Phys. 19 4703–4719.
Bhattacharya R, Roy M, Biswas M, Guha R and Bhoumick A 2010 Cosmic ray intensity and surface parameters during solar eclipse on 22 July 2009 at Kalyani in West Bengal; Curr. Sci. 98 1609–1614.
Birt W R 1836 Meteorological observations made during the solar eclipse of May 15, 1836, at Greenwich; London Edinburgh Philos. Mag. J. Sci. 9 393–394.
Bojkov R D 1968 The ozone variations during the solar eclipse of 20 May 1966; Tellus 20 417–421.
Burnett C R and Burnett E B 1985 Atmospheric hydroxyl response to the partial solar eclipse of May 1984; Geophys. Res. Lett. 12 263–266.
Burt S 2018 Meteorological impacts of the total solar eclipse of 21 August 2017; Weather 73(3) 90–95.
Chandra H, Vyas G D and Sharma S 1997 Ionospheric effects of the total solar eclipse of 24 October 1995 over Ahmedabad; Indian J. Radio Space Phys. 26 30–35.
Chimonas G 1970 Internal gravity-wave motions induced in the Earth’s atmosphere by a solar eclipse; J. Geophys. Res. 75 5545–5551.
Deen J L and Bruner M H 1933 The effect of the 1932 eclipse upon the width of stomatal openings in gray birch; Ecology 14 76–77.
Dolas P M, Ramchandran R, Gupta K S, Patil S M and Jadhav P N 2002 Atmospheric surface-layer processes during the total solar eclipse of 11 August 1999; Bound.-Layer Meteorol. 104 445–461.
Elansky N F, Glushchenco Y V, Gruzdev A N and Elokhov A S 1983 Measurements of the ozone content in the atmosphere from an aircraft during the solar eclipse on July 31, 1981; Izv. Atmos. Oceanic Phys. 19 153–156.
Fernandez W, Castro V and Hidalgo H 1993 Air temperature and wind changes in Costa Rica during the total solar eclipse of July 11, 1991; Earth, Moon Planet. 63 133–147.
Fernandez W, Hidalgo H, Coronel G and Morales E 1996 Changes in meteorological variables 15 in Coronel Oviedo, Paraguay, during the total solar eclipse of 3 November 1994; Earth, Moon Planet. 74 49–59.
Founda D, Melas D, Lykoudis S, Lisaridis I, Gerasopoulos E, Kouvarakis G, Petrakis M and Zerefos C 2007 The effect of the total solar eclipse of 29 March 2006 on meteorological variables in Greece; Atmos. Chem. Phys. 7 5543–5553.
Gerasopoulos E, Zerefos C S, Tsagouri I, Founda D, Amiridis V, Bais A F, Belehaki A, Christou N, Economou G, Kanakidou M, Karamanos A, Petrakis M and Zanis P 2008 The total solar eclipse of March 2006: Overview; Atmos. Chem. Phys. 7 17,663–17,704.
Girach I A, Nair P R, David L M, Hegde P, Mishra M K, Kumar G M, Das S M, Ojha N and Naja M 2012 The changes in near surface ozone and precursors at two nearby tropical sites during annular solar eclipse of 15 January 2010; J. Geophys. Res. Atmos. 117(D) 01303, https://doi.org/10.1029/2011JD016521.
Hanna E 2018 Meteorological effects of the 20 March 2015 solar eclipse over the United Kingdom; Weather 73(3) 71–80.
Harrington P S 1997 Eclipse!: The what, where, when, why, and how guide to watching solar and lunar eclipses; John Wiley & Sons, Inc., New York.
Kameda T, Fujita K, Sugita O, Hirasawa N and Takahashi S 2009 Total solar eclipse over Antarctica on 23 November 2003 and its effects on the atmosphere and snow near the ice sheet surface at Dome Fuji; J. Geophys. Res. Atmos. 114(D) 18.
Kawabata Y 1937 Spectrographic observation on the amount of ozone at the total solar eclipse of 15 February 1961; J. Astron. Geophys. 14 1–3.
Klobuchar J A and Whitney H E 1965 Ionospheric electron content measurements during a solar eclipse; J. Geophys. Res. 70 1254.
Kolev N, Tatarov B, Grigorieva V, Donev E, Simeonov P, Umlensky V, Kaprielov B and Kolev I 2005 Aerosol lidar and in situ ozone observations in PBL over Bulgaria during solar eclipse on 11 August 1999; Int J. Remote Sens. 26 3567–3584.
Krishnan P, Kunhikrishnan P K, Nair S M, Ravindran S, Ramachandran R, Subrahamanyam D B and Ramana M V 2004 Observations of the atmospheric surface layer parameters over a semi arid region during the solar eclipse of August 11th, 1999; Proc. Indian Acad. Sci. 113(3) 353–363.
Mims F M and Mims E R 1993 Fluctuations in column ozone during the total solar eclipse of 11 July 1991; Geophys. Res. Lett. 20 367–370.
Moon B, Jeong D-G, Oh S and Sohn J 2017 Variation in solar limb darkening coefficient estimated from solar images taken by SOHO and SDO; J. Astron. Space Sci. 34(2) 99–103.
Nayak C and Yigit E 2018 GPS-TEC observation of gravity waves generated in the ionosphere during 21 August 2017 total solar eclipse; J. Geophys. Res. Space Phys. 123 725–738.
Neckel H and Labs D 1994 Solar limb darkening 1986–1990 (λ 303 to 1099 nm); Sol. Phys. 153 91–114.
Penaloza-Murillo M A and Pasachoff J M 2015 Air-cooling mathematical analysis as inferred from the air–temperature observation during the 1st total occultation of the Sun of the 21st century at Lusaka, Zambia; J. Atmos. Sol.-Terr. Phys. 125–126 59–77.
Petkov B, Tomasi C, Vitale V, di Sarra A, Bonasoni P, Lanconelli C, Benedetti E, Sferlazzo D, Diémoz H, Agnesod G and Santaguida R 2010 Ground-based observations of solar radiation at three Italian sites, during the eclipse of 29 March 2006: Signs of the environment impact on incoming global irradiance; Atmos. Res. 96 131–140.
Pierce A K and Slaughter C D 1977 Solar limb darkening I (λ 3033 to 7297); Sol. Phys. 51 91–114.
Pierce A K, Slaughter C D and Weinberger D 1977 Solar limb darkening in the interval 7408–24018 Å; Sol. Phys. 52 179–189.
Pruitt W O, Lourence F and Crawford T V 1965 Radiation and energy balance changes during the eclipse of 20 July 1963; J. Appl. Meteorol. 4(2) 272–278.
Ramanathan A S 1954 Study of the continuous solar spectrum in the visible range; Ann. Astrophys. 17 18–29.
Sánchez-Bajo F, Vaquero J M and Rubio Montero M P 2002 Measuring solar limb-darkening with modest equipment; Eur. J. Phys. 23 323.
Sarrvesh S S, Sunder S P, Jackon I K and Kannan P 2011 Detection and analysis of solar eclipse; Proc. SPIE 8285 828518.
Sharp W E, Silverman S M and Lloyd J W F 1971 Summary of sky brightness measurements during eclipses of the sun; Appl. Opt. 10 1207–1210.
Silverman S M and Mullen E G 1975 Sky brightness during eclipses: a review; Appl. Opt. 14 2838–2843.
Singh G and Singh A K 2016 A study on precursors leading to geomagnetic storms using artificial neural network; J. Earth Syst. Sci. 125 899–908.
Singh A K, Singh R, Veenadhari B and Singh A K 2012 Response of low latitude D-region ionosphere to the total solar eclipse of 22 July 2009 deduced from ELF/VLF analysis; Adv. Space Res. 50 1352–1361.
Srivastava G P, Pakkir M P M and Balwalli R R 1982 Ozone concentration measurements near the ground at Raichur during the solar eclipse of 1980; Proc Indian Acad. Sci. A 48 138–142.
Subrahamanyam D B, Anurose T J, Mohan M, Santosh M, Kiran Kumar N V P, Sijikumar S, Prijith S S and Aloysius M 2011 Atmospheric surface-layer response to the annular solar eclipse of 15 January 2010 over Thiruvananthapuram, India; Bound.-Layer Meteorol. 141 325–332.
Tripathi A K, Chaubey S and Singh A K 2020 Study of limb darkening effect and rotation period of Sun by using a solar telescope; J. Sci. Res. 64(1) 122–126.
Tzanis C, Varotsos C and Viras L 2008 Impacts of the solar eclipse of 29 March 2006 on the surface ozone concentration, the solar ultraviolet radiation and the meteorological parameters at Athens, Greece; Atmos. Chem. Phys. 8 425–430.
Uddin W, Joshi B, Kumar T S, Sharma S and Sagar R 2007 Observations of total solar eclipse of 29 March and related atmospheric measurements; Curr. Sci. 93(7) 957–959.
Very F W 1902 The absorption power of the solar atmosphere; Astrophys. J. 16 73–91.
Wuebbles D and Chang J S 1979 A theoretical study of stratospheric trace species variations during a solar eclipse; Geophys. Res. Lett. 6 179–182.
Zeilik M 1997 Introductory astronomy and astrophysics; Cengage Learning, London.
Zerefos C S, Balis D S, Meleti C, Bais A F, Tourpali K, Vanicek K, Cappelani F, Kaminski U, Tiziano C, Stubi R, Formenti P and Andreae A 2000 Changes in environmental parameters during the solar eclipse of 11 August 1999, over Europe. Effects on surface UV 20 solar irradiance and total ozone; J. Geophys. Res. 105 26,463–26,473.
Zerefos C S, Balis D S, Zanis P, Meleti C, Bais A F, Tourpali K, Melas D, Ziomas I, Galani E, Kourtidis K, Papayannis A and Gogosheva Z 2001 Changes in surface UV solar irradiance and ozone over the Balkans during the eclipse of 11 August 1999; Adv. Space Res. 27(12) 1955–1963.
Zirker J B 1995 Total eclipses of the sun; Princeton University Press.
The study is partially supported by SERB, New Delhi for the CRG project (file no. CRG/2019/000573) and also partially by the Institute of Eminence (IoE) (scheme no. 6031) to BHU, Varanasi. We are thankful to the referee for the thoughtful comments and suggestions that helped us to improve the quality of the manuscript.
Communicated by Suresh Babu
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Chaubey, S., Singh, G. & Singh, A.K. Measurements of limb-darkening effect and solar radiation during the partial solar eclipse of 21 June 2020 at Varanasi. J Earth Syst Sci 131, 57 (2022). https://doi.org/10.1007/s12040-021-01799-5
- Solar eclipse
- solar radiation
- eclipse obscuration
- eclipse magnitude
- limb-darkening effect