Results 221 to 230 of about 58,091 (257)

Change of Solar Oscillation Eigenfrequencies with the Solar Cycle

Nature, 1985
Solar p-mode eigenfrequencies depend on the radial stratification of the solar interior and this stratification may be perturbed by the mechanism of the 11-year magnetic activity cycle. Observations of long-term changes in p-mode oscillation frequencies may therefore help to identify the cause of the solar cycle.
Martin F. Woodard, Robert W. Noyes
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Solar cycles and malignant melanoma

Medical Hypotheses, 1979
There 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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Solar Wind Variation with the Cycle

International Astronomical Union Colloquium, 2000
AbstractThe cyclic evolution of the heliospheric plasma parameters is related to the time-dependent boundary conditions in the solar corona. “Minimal” coronal configurations correspond to the regular appearance of the tenuous, but hot and fast plasma streams from the large polar coronal holes. The denser, but cooler and slower solar wind is adjacent to
I. S. Veselovsky, A. V. Dmitriev, A. V. Suvorova, M. V. Tarsina   +3 more
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A Simple Model for the Solar Cycle

Solar Physics, 2003
A simple nonlinear model which describes the 11-year solar cycle can be derived from the usual α−ω dynamo theory in the form of a Van der Pol equation. Solar activity displays also small-scale inter-cycle persistent stochastic oscillations with a Hurst exponent of the order of H≃0.76±0.01.
PONTIERI A, LEPRETI, Fabio, SORRISO VALVO L, VECCHIO A, CARBONE V.   +4 more
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The Periodicity of Solar Activity Cycles

Solar Physics, 1994
On the basis of published Wolf Numbers and Schove Row, solar activity cycles in the interval of 11 to hundreds of years have been investigated. In this case the method of investigation of pulsating stars showing the Blazhko effect was applied. The elements of cycles and O-C were calculated and compared with results of solar activity parameters ...
Yu. S. Romanov, N. S. Zgonyaiko
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Solar activity and the solar cycle

Advances in Space Research, 2003
Abstract 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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IS THE SOLAR ACTIVITY CYCLE SYNCHRONIZED WITH THE SOLAR INERTIAL MOTION?

International Journal of Bifurcation and Chaos, 2000
The 300 year record of the yearly sunspot numbers and numerically generated trajectory of the solar inertial motion (SIM) were subjects of a synchronization analysis. Phase synchronization of the sunspot cycle and a fast component of the SIM have been found and confirmed with statistical significance in three epochs (1727–1757, 1802–1832 and 1863–1922)
Milan Palus, Jürgen Kurths, Udo Schwarz, Dagmar Novotná, Ivanka Charvátová   +4 more
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Prediction of Solar Cycle Maximum Using Solar Cycle Lengths

Solar Physics, 2008
If 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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Peculiar behaviour of solar cycle-23 in comparison to previous solar cycles

Indian Journal of Physics, 2012
The abrupt decrease in cosmic ray intensity and disturbances in geomagnetic field are known as Forbush decreases (FDs) and Geomagnetic storms (GSs) respectively. We have selected the number of FDs and GSs during solar cycles 20–23. It is found that the occurrence of FDs follows the sunspot cycle 23, whereas the occurrence of GSs does not follow the ...
B. N. Mishra, A. P. Mishra
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Solar Activity, Solar Cycle, Coordinates

1996
The 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, Gerd K. Hartmann, Reinhart Leitinger   +2 more
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