Results 21 to 30 of about 1,248,900 (279)
Tests of Sunspot Number Sequences: 4. Discontinuities Around 1946 in Various Sunspot Number and Sunspot-Group-Number Reconstructions [PDF]
Solar Physics, 2016 In press with Solar ...
Lockwood, M., Owens, M. J., Barnard, L.
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ANALYSIS OF SUNSPOT NUMBER FLUCTUATIONS [PDF]
Fractals, 2004 Monthly averages of the sunspot number visible on the sun, observed from 1749, Zurich Observatory, and from 1848 other observatories, have been analyzed. This time signal presents a frequency power spectra with a clear 1/fα behavior with α≃0.8±0.2.
Fanchiotti, H. +3 more
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Journal of Water and Climate Change, 2021 The relation between sunspots and rainfall patterns is still obscure in Africa, especially for Sudan and South Sudan. This research explores the response of rainfall to solar activity in eastern regions of Africa, with a case study in Sudan and South ...
Mostafa A. Mohamed +1 more
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Active Days around Solar Minimum and Solar Cycle Parameter
Journal of Astronomy and Space Sciences, 2021 Utilizing a new version of the sunspot number and group sunspot number dataset available since 2015, we have statistically studied the relationship between solar activity parameters describing solar cycles and the slope of the linear relationship ...
Heon-Young Chang
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On the Relation Between the Sun and Climate Change with the Solar North-South Asymmetry [PDF]
Journal of Astronomy and Space Sciences, 2009 We report the relation between the solar activity and terrestrial climate change with the solar north-south asymmetry. For this purpose, we calculate sliding correlation coefficients between sunspot numbers and earth`s mean annual temperature anomalies ...
I. H. Cho +4 more
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Solar Cycle 25 Prediction Using N-BEATS
The Astrophysical Journal, 2023 Solar activities lead to Sun variation with an 11 yr periodicity. The periodic variation affects space weather and heliophysics research. So it is important to accurately predict solar cycle variations. In this paper, we predicted the ongoing Solar Cycle
Xu Su +4 more
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Relationships Between foF2 and Various Solar Activity Proxies
Space Weather, 2023 To study ionospheric climate, to model the ionosphere (e.g., the International Reference Ionosphere—IRI) and to investigate its long‐term changes and trends, solar activity proxies/indices have been used, because long and homogeneous data series of solar
Jan Laštovička, Dalia Burešová
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Long-term variations in the geomagnetic activity level Part II: Ascending phases of sunspot cycles [PDF]
Annales Geophysicae, 1994 Monthly averages of the Helsinki Ak-values have been reduced to the equivalent aa-indices to extend the aa-data set back to 1844. A periodicity of about five cycles was found for the correlation coefficient (r) between geomagnetic indices and sunspot ...
V. Mussino +3 more
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Periodic analysis of forest fire numbers and sunspot numbers in Türkiye [PDF]
, 2022 The aim of this study is to examine the periodic structures of forest fire numbers in Türkiye and sunspot numbers. The main purpose of this study is to investigate the variability of forest fire numbers in Turkey and sunspot numbers using continuous ...
Cengiz, Taner Mustafa +1 more
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Does Correction Factor Vary with Solar Cycle? [PDF]
Journal of Astronomy and Space Sciences, 2012 Monitoring sunspots consistently is the most basic step required to study various aspects of solar activity. To achieve this goal, the observers must regularly calculate their own correction factor k and keep it stable. Relatively recently, two observing
Heon-Young Chang, Sung-Jin Oh
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