Scientists have been counting sunspots with small telescopes since 1610 so it was quickly learned that the Sun’s activity increases every eleven years, according to the interval in the growth of the number of darker and colder spots in comparison with the rest of its surface. The more spots that appear, the more luminous the surrounding areas are, and our star shines brighter.
Even with telescope data, the indices used by scientists disagreed on solar activity of dates prior to 1885 but a new effort to standardize the historical results finds that the solar activity of our times is very similar to the Enlightenment. And it confirms that the eleven-year cycles don't always have the same intensity and probably never did. The more intense peaks of the Sun’s luminosity were produced in the 20th century, which experts have called the ‘modern maximum’ but there were also elevated values in other periods.
International sunspot number. / Credit: Royal Observatory of Belgium/SILSO graphics
“It has been a huge surprise to observe that in the 18th century the levels of the Sun’s activity were practically the same as they are now,” says José M. Vaquero, researcher at the University of Extremadura (Spain) and co-author of the research, which is a review of the number of sunspots recorded in the last 400 years.
The results also reveal that in other periods the opposite occurred, such as the Maunder minimum (1645-1715), when the sunspots practically disappeared and solar activity was drastically reduced.
“A proper estimate of the past and present activity of the Sun, our main source of light and heat, is crucial in understanding numerous phenomena that occur on Earth, especially to rule out the role of the Sun in global warming,” says Vaquero, “but we come up against the problem that two indices or ways of calculating historical solar activity exist, and their data does not coincide when describing what happened before the 20th century”.
Discrepancy between European and American indices
The first index is the ‘International Sunspot Number’ or Wolf number, thought up by the Swiss astronomer Rudolf Wolf in 1849. It is currently the method followed by the Royal Observatory of Belgium, aided by a network of more than a hundred other astronomical observatories, the majority amateur. The second version is the ‘Group Sunspot Number’, and was created by US scientists Douglas V. Hoyt and K.H. Schatten in 1998.
“Unfortunately these two series only coincide in the more recent period, from approximately 1885 onwards,” points out Vaquero. “In the previous periods, the US index shows a much lower level of solar activity than the European one, and this causes confusion and contradictions when the number of sunspots is used in modern research regarding the solar dynamo or the solar forcing on the Earth’s climate system, for example”.
The historical study of sunspots has led to the detection of several errors in the two versions. Their authors, from centres such as the Royal Observatory of Belgium, Stanford University and the US National Solar Observatory, have also been able to correct some of the detected incidents.
To carry out this research, Spain has provided information from the catalogue of sunspots from the Observatory of the University of Valencia, created between 1920 and 1928 before its fire, and data from the Astronomical Observatory of Madrid recorded between 1876 and 1986.
References:
Frédéric Clette, Leif Svalgaard, José M. Vaquero y Edward W. Cliver. “Revisiting the Sunspot Number A 400-Year Perspective on the Solar Cycle”. Space Science Reviews, 2014. Doi: 10.1007/s11214-014-0074-2.
A. J. P. Aparicio, J. M. Vaquero, V. M. S. Carrasco, M. C. Gallego. “Sunspot Numbers and Areas from the Madrid Astronomical Observatory (1876 – 1986)” y “Sunspot Catalogue of the Valencia Observatory (1920-1928)”. Solar Physics 289 (11), 2014.
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