Solar cycle 4 was the fourth solar cycle since 1755, when extensive recording of solar sunspot activity began.[1][2] The solar cycle lasted 13.6 years, beginning in September 1784 and ending in April 1798 (thus overlapping the Dalton Minimum). The maximum smoothed sunspot number observed during the solar cycle was 235.3 (in February 1788), and the starting minimum was 15.9.[3]
There are some recent speculations that cycle 4, the longest solar cycle since 1755, was actually two cycles, based on the appearance of new sunspots at high solar latitudes in 1793–1796 and a reconstruction of the sunspot butterfly diagram for cycles 3 and 4,[4][5] although total sunspot numbers only show a single-peaked distribution.[3]
^Kane, R.P. (2002). "Some Implications Using the Group Sunspot Number Reconstruction". Solar Physics205(2), 383–401.
^"The Sun: Did You Say the Sun Has Spots?". Space Today Online. Retrieved 12 August 2010.
^ abSIDC Monthly Smoothed Sunspot Number. "[1]"
^Usoskin, I. G.; Mursula, K.; Arlt, R.; Kovaltsov, G. A. (2009). "A Solar Cycle Lost in 1793–1800: Early Sunspot Observations Resolve the Old Mystery". The Astrophysical Journal. 700 (2): L154. arXiv:0907.0063. Bibcode:2009ApJ...700L.154U. doi:10.1088/0004-637X/700/2/L154.
^"Centuries-old sketches solve sunspot mystery", New Scientist, 1 August 2009, p. 10.
Solarcycle4 was the fourth solarcycle since 1755, when extensive recording of solar sunspot activity began. The solarcycle lasted 13.6 years, beginning...
The solarcycle, also known as the solar magnetic activity cycle, sunspot cycle, or Schwabe cycle, is a nearly periodic 11-year change in the Sun's activity...
Solarcycles are nearly periodic 11-year changes in the Sun's activity that are based on the number of sunspots present on the Sun's surface. The first...
Solarcycle 25 is the current solarcycle, the 25th since 1755, when extensive recording of solar sunspot activity began. It began in December 2019 with...
Solarcycle 20 was the twentieth solarcycle since 1755, when extensive recording of solar sunspot activity began. The solarcycle lasted 11.4 years, beginning...
Solarcycle 10 was the tenth solarcycle since 1755, when extensive recording of solar sunspot activity began. The solarcycle lasted 11.3 years, beginning...
Solarcycle 23 was the 23rd solarcycle since 1755, when extensive recording of solar sunspot activity began. The solarcycle lasted 12.3 years, beginning...
Solarcycle 5 was the fifth solarcycle since 1755, when extensive recording of solar sunspot activity began. The solarcycle lasted 12.3 years, beginning...
Solarcycle 3 was the third solarcycle since 1755, when extensive recording of solar sunspot activity began. The solarcycle lasted 9.3 years, beginning...
Solarcycle 9 was the ninth solarcycle since 1755, when extensive recording of solar sunspot activity began. The solarcycle lasted 12.4 years, beginning...
secondary steam cycle will warm up, improving fuel efficiency and providing further power. In November 2013, the Fraunhofer Institute for Solar Energy Systems...
Solarcycle 12 was the twelfth solarcycle since 1755, when extensive recording of solar sunspot activity began. The solarcycle lasted 11.3 years, beginning...
Solarcycle 16 was the sixteenth solarcycle since 1755, when extensive recording of solar sunspot activity began. The solarcycle lasted 10.1 years, beginning...
Solarcycle 8 was the eighth solarcycle since 1755, when extensive recording of solar sunspot activity began. The solarcycle lasted 9.7 years, beginning...
geomagnetic storm components that occurred from 10–13 May 2024 during solarcycle 25. The geomagnetic storm was the most powerful to affect Earth since...
in divine years (years of the gods), each lasting for 360 solar (human) years. Each Yuga Cycle lasts for 4,320,000 years (12,000 divine years) with its...
1790 to 1830 or 1796 to 1820, corresponding to the period solar cycle4 to solarcycle 7. While the Dalton Minimum is often compared with the Maunder Minimum...
Price (2004-10-25). "Parabolic Trough Organic Rankine CycleSolar Power Plant" (PDF). 2004 DOE Solar Energy Technologies. Denver, Colorado: US Department...
153H. doi:10.1086/142452. "NASA Satellites Capture Start of New SolarCycle". PhysOrg. 4 January 2008. Archived from the original on 6 April 2008. Retrieved...
The Solar Hijri calendar is the official calendar of Iran. It is a solar calendar and is the one Iranian calendar that is the most similar to the Gregorian...
being 1.361 kilowatts per square meter (kW/m2) at solar minimum (the time in the 11-year solarcycle when the number of sunspots is minimal) and approximately...
ejections, solar particle events, and other eruptive solar phenomena. The occurrence of solar flares varies with the 11-year solarcycle. Solar flares are...
A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby obscuring the view of the Sun from a small part of Earth, totally or partially...
Irradiance in space is a function of distance from the Sun, the solarcycle, and cross-cycle changes. Irradiance on the Earth's surface additionally depends...
polarity. Their number varies according to the approximately 11-year solarcycle. Individual sunspots or groups of sunspots may last anywhere from a few...
Global Information