Solar cycle 10
Solar cycle 10 was the tenth solar cycle since 1755, when extensive recording of solar sunspot activity began. The solar cycle lasted 11.3 years, beginning in December 1855 and ending in March 1867. The maximum smoothed sunspot number (SIDC formula) observed during the solar cycle was 186.2 (February 1860), and the starting minimum was 6.0. During the transit from solar cycle 10 to 11, there were a total of 406 days with no sunspots.
|Solar cycle 10|
Sunspots during solar cycle 10, as sketched by Richard Carrington (September 1, 1859).
|Start date||December 1855|
|End date||March 1867|
|Max count month||February 1860|
|Previous cycle||Solar cycle 9 (1843-1855)|
|Next cycle||Solar cycle 11 (1867-1878)|
Solar storm of 1859Edit
On September 1–2, 1859, the largest recorded geomagnetic storm on Earth occurred, known as the Carrington Event. Aurorae were seen around the world, even over the Caribbean; those over the Rocky Mountains were so bright that their glow awoke gold miners, who began preparing breakfast because they thought it was morning.
Telegraph systems all over Europe and North America failed. Telegraph pylons threw sparks and telegraph paper spontaneously caught fire. Some telegraph systems appeared to continue to send and receive messages despite having been disconnected from their power supplies.
From August 28, 1859 until September 2, numerous sunspots and solar flares were observed on the sun. Just before noon on September 1, the British astronomer Richard Carrington observed the largest flare, which would later be named after him.
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