It is also believed that an increase in sunspot activity can have an affect on pole reversal. |
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Between the mid-sixteenth and seventeenth centuries, the sunspot cycle shut down, reducing solar output by a mere 0.25 percent. |
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Many magnetic storms occurred in tandem with reports of solar flares or of large sunspot regions near the Sun's equator. |
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In August it is crammed with holidaymakers, and all the usual paraphernalia of a Mediterranean sunspot. |
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The darkest, central region of a sunspot, called the umbra, features tightly bundled magnetic field lines. |
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Three methods to determine the heliographic latitude and longitude of sunspot groups are described below. |
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Only sunspot number counts cover a longer period, going back to at least the 17th Century. |
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A sunspot always has an associated facula, though faculae may exist apart from such spots. |
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Until now, Dr. Wolff said, there have been only indirect and inconclusive evidence for Rossby waves through sunspot observations. |
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They also argue about the effect of changes in the sunspot cycle on temperatures. |
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He says sunspots are an indicator of the amount of energy radiating from the sun and we're currently coming out of a sunspot minimum. |
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They are more frequent every eleven years, a cycle that corresponds with maximum sunspot activity. |
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They say solar sunspot cycles are also a factor influencing the summer outlook. |
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During the periods where the earth warms up dramatically, there is an increase in sunspot activity. |
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The quality varies widely, since the signal is susceptible to ionospheric disturbances caused by sunspot activity. |
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The eclipse record shows a strong dip in signal strength after 11:40 local time, when the Moon covered a large sunspot on the solar disc. |
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Scientists have noticed that sunspot activity tends to follow a regular cycle that peaks every 11 years. |
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When using ICEAREA, judgement is required to select appropriate sunspot numbers and to account for multipath effects. |
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Sunspot number simply represents the number of observed sunspots and sunspot groups on the solar surface. |
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For example, magnetic fields could be added to global simulations of solar convection to address the operation of the dynamo that drives the sunspot cycle. |
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Theorists suspect that the penumbra is key to keeping a sunspot intact. |
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The Sun is not considered a variable star, but it does undergo periodic changes in activity known as the sunspot cycle. |
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The correlation between these warming periods throughout the earth's history, according to the scientists I spoke with, relates to sunspot activity. |
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Solar flares are sudden brightening of flocculus near an active sunspot group, becoming brilliant within a few minutes. |
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There is still a very poor understanding of the correlation between low sunspot activity and cooling temperatures. |
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This led to the question of whether this was a variation in the emission from the whole disc or that smaller, variable sources were present, perhaps associated with active regions and sunspot groups. |
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The quality of the connection depends on the carrier wave, which varies with the time of day, the weather, sunspot activity, distance, and other factors. |
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Although similar observations have been made before, Dr Hathaway's are the first, he claims, to provide an unambiguous explanation of what governs the sunspot cycle. |
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While the well-known 11-year sunspot cycle contributes to short-term climate variability, longer term changes in solar behaviour are not well understood or predictable. |
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In 1946, he made the discovery that sunspots are very bright at 10.7 cm wavelength, offering a simple all-weather method to measure and predict sunspot activity. |
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The peak of North Dakotan auroral activity appears to take place after sunspot maximum and when the spots are declining. |
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They found a loose match between temperature and the number of sunspots but a much better one between temperature and the length of the sunspot cycle. |
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We use sunspot group observations from the Royal Greenwich Observatory to investigate the effects of intercalibrating data from observers with different visual acuities. |
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Sunspot activity seems to have been less common during the little ice age, and this further confuses the issue. |
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And Bishop, colossus, Warpath, Blink, Sunspot, Quiksilver, Stryker and Havoc will all be there too. |
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As solar cycle 24 progresses towards its predicted maximum in early 2013, the Relative Sunspot number has gained momentum during the session. |
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