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The International Geophysical Year occurred at the peak of this solar cycle. The maximum smoothed sunspot number observed during the solar cycle was 285.0, in March 1958 (the highest on record [3]), and the starting minimum was 5.1. [4] During the minimum transit from solar cycle 19 to 20, there were a total of 227 days with no sunspots.
Solar maximum is the regular period of greatest solar activity during the Sun's 11-year solar cycle. During solar maximum, large numbers of sunspots appear, and the solar irradiance output grows by about 0.07%. [2] On average, the solar cycle takes about 11 years to go from one solar maximum to the next, with duration observed varying from 9 to ...
Solar cycle 15–16 1917 – Aug 534 Solar cycle 16–17 1928 – Apr 568 Solar cycle 17–18 1937 – Apr 269 Solar cycle 18–19 1947 – May 446 Solar cycle 19–20 1958 – Mar 227 Solar cycle 20–21 1968 – Nov 272 Solar cycle 21–22 1979 – Dec 273 Solar cycle 22–23 1989 – Oct 309 Solar cycle 23–24 2001 – Nov 817 Solar cycle ...
An extreme storm, estimated at Dst −531 nT arose from a fast CME (mean ≈1500 km/s), occurred during the ascending phase of the minimum of the relatively weak solar cycle 14, which is the most significant storm on record in a solar minimum period. Aurora was conservatively observed to ≈44.1° ILAT, and widespread disruptions and ...
The "Great Red Aurora", the strongest recorded solar maximum, reached its peak of activity; a magnetic storm creating a fan shaped-aurora was observed from multiple areas in the Northern Hemisphere starting at 0053 UTC. [50] [51] Marshal Chen Yi became the new Chinese Foreign Minister, replacing Zhou Enlai. [52]
The Sun has reached a period of peak activity in an 11-year cycle known as the Solar Maximum, marked by recent geomagnetic storms and near-global aurora light displays.. Solar Cycle 25 has been ...
February 11 – The strongest known solar maximum is recorded. [2] March 5 – Explorer 2 fails to reach orbit. March 17 – Vanguard 1 becomes the first of its program to enter space, after three failed attempts. March 26 – Explorer 3 is launched into orbit. April 14 – Sputnik 2 re-enters Earth's atmosphere.
The Modern Maximum was found by Sami Solanki, Ilya G. Usoskin and colleagues [1] as the period of unusually high solar activity [2] which began with solar cycle 15 in 1914. It reached a maximum in solar cycle 19 during the late 1950s and may have ended with the peak of solar cycle 23 in 2000, as solar cycle 24 is recording, at best, very muted ...