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One historical long-term correlation between solar activity and climate change is the 1645–1715 Maunder minimum, a period of little or no sunspot activity which partially overlapped the "Little Ice Age" during which cold weather prevailed in Europe. The Little Ice Age encompassed roughly the 16th to the 19th centuries.
Just as they impact ocean currents, they can also shift the Earth's plates. New study shows the Sun and Moon's pull may trigger San Andreas earthquakes Skip to main content
Three solar flares occurred over a 24-hour period this week. While we may not see them with a naked eye, they can affect Earth. Here's how.
Individual sunspots or groups of sunspots may last anywhere from a few days to a few months, but eventually decay. Sunspots expand and contract as they move across the surface of the Sun, with diameters ranging from 16 km (10 mi) [3] to 160,000 km (100,000 mi). [4] Larger sunspots can be visible from Earth without the aid of a telescope. [5]
Both long term variations in solar intensity are known to affect global climate. [62] Solar output varies on shorter time scales, including the 11-year solar cycle [63] and longer-term modulations. [64] Correlation between sunspots and climate and tenuous at best. [62]
Millennia later, we have the myth that earthquakes occur during windy weather. Humans gained a fuller knowledge of quakes after the devastating 1755 Lisbon earthquake , an 8.5 which rocked the ...
Sunspot activity has been measured using the Wolf number for about 300 years. This index (also known as the Zürich number) uses both the number of sunspots and the number of sunspot groups to compensate for measurement variations. A 2003 study found that sunspots had been more frequent since the 1940s than in the previous 1150 years. [30]
When the Sun's disk is obscured during a total solar eclipse or by a coronagraph (pictured), coronal structures not otherwise visible can be observed above the limb. [3] Coronal holes were first observed during total solar eclipses. They appeared as dark regions surrounded by much brighter helmet streamers above the Sun's limb. [3]