Solar activity cycle influenced by changing magnetic fields

Physics Today ◽  
2010 ◽  
Keyword(s):  
Solar Activity ◽  
Magnetic Fields ◽  
Activity Cycle ◽  
Solar Activity Cycle

Corotational solar streams and cosmic-ray diurnal anisotropy

1991 ◽  
Vol 69 (8-9) ◽  
pp. 981-983
Author(s):  
A. G. Ananth ◽  
D. Venkatesan
Keyword(s):  
Solar Activity ◽  
Magnetic Fields ◽  
Geomagnetic Activity ◽  
Cosmic Ray ◽  
Activity Cycle ◽  
Solar Activity Cycle ◽  
Detailed Comparison ◽  
Secondary Peak ◽  
Solar Magnetic Fields ◽  
Diurnal Anisotropy

A detailed comparison of the behavior of cosmic-ray diurnal anisotropy with the solar activity cycle indicates that the amplitude of the diurnal anisotropy is significantly modulated by the corotational streams that produce the secondary peak in geomagnetic activity. However, the time of the maximum of diurnal anisotropy does not show any systematic changes with solar activity but indicates a shift towards earlier hours (~12:00 LT), corresponding to the reversal of polarity of solar magnetic fields.

Surface magnetic fields during the solar activity cycle

Solar Physics ◽  
1981 ◽  
Vol 74 (1) ◽  
pp. 131-145 ◽  
Author(s):  
Robert Howard ◽  
Barry J. Labonte
Keyword(s):  
Solar Activity ◽  
Magnetic Fields ◽  
Activity Cycle ◽  
Solar Activity Cycle

Trends in Parameters of the F2 Layer and the 24th Solar-Activity Cycle

2020 ◽  
Vol 60 (5) ◽  
pp. 586-596 ◽  
Author(s):  
A. D. Danilov ◽  
A. V. Konstantinova
Keyword(s):  
Solar Activity ◽  
Activity Cycle ◽  
Solar Activity Cycle

scholarly journals On the Prediction of Solar Cycles

Solar Physics ◽  
2021 ◽  
Vol 296 (1) ◽  
Author(s):  
V. Courtillot ◽  
F. Lopes ◽  
J. L. Le Mouël
Keyword(s):  
Solar Activity ◽  
Solar Cycle ◽  
Transfer Function ◽  
Singular Spectrum Analysis ◽  
Activity Cycle ◽  
Solar Activity Cycle ◽  
Planetary Motion ◽  
Data Sets ◽  
Solar Cycles ◽  
Jovian Planets

AbstractThis article deals with the prediction of the upcoming solar activity cycle, Solar Cycle 25. We propose that astronomical ephemeris, specifically taken from the catalogs of aphelia of the four Jovian planets, could be drivers of variations in solar activity, represented by the series of sunspot numbers (SSN) from 1749 to 2020. We use singular spectrum analysis (SSA) to associate components with similar periods in the ephemeris and SSN. We determine the transfer function between the two data sets. We improve the match in successive steps: first with Jupiter only, then with the four Jovian planets and finally including commensurable periods of pairs and pairs of pairs of the Jovian planets (following Mörth and Schlamminger in Planetary Motion, Sunspots and Climate, Solar-Terrestrial Influences on Weather and Climate, 193, 1979). The transfer function can be applied to the ephemeris to predict future cycles. We test this with success using the “hindcast prediction” of Solar Cycles 21 to 24, using only data preceding these cycles, and by analyzing separately two 130 and 140 year-long halves of the original series. We conclude with a prediction of Solar Cycle 25 that can be compared to a dozen predictions by other authors: the maximum would occur in 2026.2 (± 1 yr) and reach an amplitude of 97.6 (± 7.8), similar to that of Solar Cycle 24, therefore sketching a new “Modern minimum”, following the Dalton and Gleissberg minima.

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