Definition, Betydelse, Synonymer & Anagram | Engelska ordet SUNSPOT

Definition av SUNSPOT

1. solfläck

Exempel på hur man kan använda SUNSPOT i en mening

• 28 BC – A sunspot is observed by Han dynasty astronomers during the reign of Emperor Cheng of Han, one of the earliest dated sunspot observations in China.
• The Maunder Minimum, also known as the "prolonged sunspot minimum", was a period around 1645 to 1715 during which sunspots became exceedingly rare.
• The major fluctuation is the eleven-year solar cycle (sunspot cycle) that causes a quasi-periodic variation of about ±0.
• April – George Ellery Hale and collaborators publish their discovery that the magnetic polarity of sunspot pairs reverses on an 11-year solar cycle and that the polarity varies by hemisphere, which becomes known as Hale's law.
• After studying the work of Gustav Spörer, who examined old records from the different observatories archives looking for changes of the heliographic latitude of sunspots, Maunder presented a paper on Spörer's conclusions to the Royal Astronomical Society in 1890 and analyzed the results to show the presence of a prolonged sunspot minimum in the 17-18th century in a paper published in 1894.
• Richard Christopher Carrington (26 May 1826 – 27 November 1875) was an English amateur astronomer whose 1859 astronomical observations demonstrated the existence of solar flares as well as suggesting their electrical influence upon the Earth and its aurorae; and whose 1863 records of sunspot observations revealed the differential rotation of the Sun.
• One can see ice blocks on the move in the form of meteors, and when one collides with Earth, it produces hailstorms over an area of many square kilometers, while when one falls into the Sun, it produces a sunspot and gets vaporized, making "fine ice", that covers the innermost planets.
• He also did some sunspot observations and published a series of articles, mostly in the Astronomische Nachrichten, on subjects such as comets, the theoretical considerations of comets "falling into the Sun", Tycho Brahe, and occultations of stars by the Moon.
• Bolton was first assigned to measure the polarisation properties of sunspot radiations, an area of active investigation as the Sun was recently confirmed to be radio bright during World War 2.
• This led him to do a lot of research in the history of his own field, particularly covering records of past eclipses and sunspot counts, whereupon he discovered the records of Edward Maunder and others demonstrating that there was indeed long term variability in solar activity.
• In the 1920s Yule wrote three influential papers on time series analysis, "On the time-correlation problem" (1921), a critique of the variate difference method, an investigation of a form of spurious correlation (1926) and "On a Method of Investigating Periodicities in Disturbed Series, with Special Reference to Wolfer's Sunspot Numbers" (1927), which used an autoregressive model to model the sunspot time series instead of the established periodogram method of Schuster.
• The observatory factor compensates for the differing number of recorded individual sunspots and sunspot groups by different observers.
• While the Dalton Minimum is often compared with the Maunder Minimum, its sunspot number was slightly higher and reported sunspots distributed in both solar hemispheres unlike the Maunder Minimum.
• They are difficult to observe due to their small size and because of the high brightness contrast between the sunspot umbra and the surrounding photosphere.
• An exceptional and unexpected burst of sunspot activity results in the death of Claggett and Linley: the two astronauts are exposed to a lethal level of radiation while out on the lunar surface during a large solar flare.
• The first machina helioscopica or helioscope was designed by Christoph Scheiner (1575 –1650) to assist his sunspot observations.

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