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Solar Activity, Solar Cycle, Coordinates
1996The structure and the dynamics of the upper atmosphere depend on the energy input from the Sun via extreme ultraviolet and X-ray radiation (XUV) and on the properties of the solar wind. Contrary to the good temporal stability of the Sun’s radiation intensity at longer wavelengths (from infrared to near ultraviolet) the energy output of the Sun is ...
Walter Dieminger +2 more
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Physics Today, 1982
Nearly 140 years have elapsed since the German apothecary and amateur astronomer Samuel Heinrich Schwabe reported discovery of the solar cycle. “From my earlier observations,” Schwabe wrote in 1843, “it appears that there is a certain periodicity in the appearance of sunspots and this theory seems more and more probable from the results of this year ...
Gordon Newkirk, Kendrick Frazier
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Nearly 140 years have elapsed since the German apothecary and amateur astronomer Samuel Heinrich Schwabe reported discovery of the solar cycle. “From my earlier observations,” Schwabe wrote in 1843, “it appears that there is a certain periodicity in the appearance of sunspots and this theory seems more and more probable from the results of this year ...
Gordon Newkirk, Kendrick Frazier
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Prediction of Solar Cycle Maximum Using Solar Cycle Lengths
Solar Physics, 2008If the rise time RT, fall time FT, and total time TT (i.e., RT+FT) of a solar cycle are compared against the maximum amplitude Rz(max ) for the following cycle, then only the association between TT and Rz(max ) is inferred to be well anticorrelated, inferring that the larger (smaller) the value of Rz(max ) for the following cycle, the shorter (longer ...
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Solar cycles and malignant melanoma
Medical Hypotheses, 1979There has been a sixfold increase in the incidence of malignant melanoma in the State of Connecticut during the past forty years. Superimposed on a steady incidence rise are cycles of markedly increased incidence rates which follow periods of maximum sunspot activity. We propose that the effect of sunspot cycles on human melanoma occurrence is mediated
M V, Viola, A, Houghton, E W, Munster
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2007
Ulysses’ launch in October of 1990 was at the maximum of solar activity cycle 22. The first passages through the polar regions of the heliosphere came in 1994 and 1995, very near the minimum of activity between cycles 22 and 23. The second orbit then took Ulysses through the polar regions in 2000 and 2001, at the maximum of solar activity for cycle 23,
David H. Hathaway, Steven T. Suess
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Ulysses’ launch in October of 1990 was at the maximum of solar activity cycle 22. The first passages through the polar regions of the heliosphere came in 1994 and 1995, very near the minimum of activity between cycles 22 and 23. The second orbit then took Ulysses through the polar regions in 2000 and 2001, at the maximum of solar activity for cycle 23,
David H. Hathaway, Steven T. Suess
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The solar cycle: predicting the peak of solar cycle 25
Astrophysics and Space Science, 2020Motivated by a successful prediction on the peak of solar cycle 24 (81.7, comparable to the observed 81.9, Du in Astrophys. Space Sci. 338:9, 2012), based on the logarithmic relationship between the maximum amplitude ( $R_{ \mathrm{m}}$ ) of a solar cycle and the preceding minimum $aa$ geomagnetic index ( $aa_{\mathrm{min}}$ ), we perform a ...
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Space Science Reviews, 2008
Predicting the behavior of a solar cycle after it is well underway (2–3 years after minimum) can be done with a fair degree of skill using auto-regression and curve fitting techniques that don’t require any knowledge of the physics involved. Predicting the amplitude of a solar cycle near, or before, the time of solar cycle minimum can be done using ...
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Predicting the behavior of a solar cycle after it is well underway (2–3 years after minimum) can be done with a fair degree of skill using auto-regression and curve fitting techniques that don’t require any knowledge of the physics involved. Predicting the amplitude of a solar cycle near, or before, the time of solar cycle minimum can be done using ...
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2020
In this chapter we discuss several methods for forecasting solar activity on different time scales. The solar radiation and particle emission influences on the space around Earth, the Earth’s magnetosphere, the Earth’s atmosphere, and can be harmful for satellites and manned spacecraft missions and disrupt communication systems.
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In this chapter we discuss several methods for forecasting solar activity on different time scales. The solar radiation and particle emission influences on the space around Earth, the Earth’s magnetosphere, the Earth’s atmosphere, and can be harmful for satellites and manned spacecraft missions and disrupt communication systems.
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Solar Physics, 1981
The properties of kinematic αω -dynamos are briefly reviewed. The mean field concept, including turbulent diffusivity, is defended against recent criticism. It is pointed out that although the Maunder minimum cannot be explained by kinematic dynamo theory alone, this does not invalidate dynamo theory in general.
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The properties of kinematic αω -dynamos are briefly reviewed. The mean field concept, including turbulent diffusivity, is defended against recent criticism. It is pointed out that although the Maunder minimum cannot be explained by kinematic dynamo theory alone, this does not invalidate dynamo theory in general.
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Solar activity and the solar cycle
Advances in Space Research, 2003Abstract Solar activity prediction methods have been wide-ranging, mostly numerical, and essentially curve fitting. Thus for many years the search for physically based methods has remained elusive. Surprisingly, a new class of methods does seem to be making progress, and it relates to the structure of the field within the Sun and heliosphere.
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