Results 11 to 20 of about 1,956,285 (237)
Prediction of even and odd sunspot cycles [PDF]
Journal of Space Weather and Space Climate, 2023 Here we study the prediction of even and odd numbered sunspot cycles separately, thereby taking into account the Hale cyclicity of solar magnetism. We first show that the temporal evolution and shape of all sunspot cycles are extremely well-described by ...
Asikainen Timo, Mantere Jani
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Forecasting the number of sunspots for solar cycle 25 utilizing the facebook prophet model [PDF]
Scientific ReportsThe solar cycle, also referred to as the solar magnetic activity cycle, represents a nearly periodic change in solar activity occurring approximately every 11 years, as evidenced by the observation of sunspot numbers.
H. I. Abdel Rahman, W. A. Badawy
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Fractal Dimension and Maximum Sunspot Number in Solar Cycle [PDF]
Journal of Astronomy and Space Sciences, 2006 The fractal dimension is a quantitative parameter describing the characteristics of irregular time series. In this study, we use this parameter to analyze the irregular aspects of solar activity and to predict the maximum sunspot number in the following ...
R.-S. Kim +4 more
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An upper limit prediction of the peak sunspot number for solar cycle 24
Journal of Space Weather and Space Climate, 2011 In this paper we address the prediction of the maximum sunspot number in solar cycle 24. We correlate the integral sunspot activity related to the variability of the cycle decrease speed in the declining phase with the height of the next sunspot maximum.
Van der Linden R., Podladchikova T.
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The proposed “Waldmeier discontinuity”: How does it affect to sunspot cycle characteristics?
Journal of Space Weather and Space Climate, 2012 Recently, Svalgaard has proposed that Waldmeier introduced a discontinuity in the International Sunspot Number (ISN) around 1945. In this paper, we study some characteristics of the sunspot cycle using the classical ISN and the proposed version derived ...
Pérez Aparicio Alejandro Jesús +2 more
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Bistability in the sunspot cycle [PDF]
Europhysics LettersAbstract A direct dynamical test of the sunspot cycle is carried out to indicate that a stochastically forced nonlinear oscillator characterizes its dynamics. The sunspot series is then decomposed into its eigen time-delay coordinates.
Vashishtha, Sumit +1 more
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The lost sunspot cycle: Reanalysis of sunspot statistics [PDF]
Astronomy & Astrophysics, 2003 We have recently suggested that one low sunspot cycle was possibly lost in 1790s (Usoskin et al. 2001, A&A, 370, L31). In this paper we present the results of a rigorous statistical analysis of all available sunspot observations around the suggested additional cycle minimum in 1792-1793.
I. G. Usoskin +2 more
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Deciphering solar magnetic activity: The (solar) hale cycle terminator of 2021
Frontiers in Astronomy and Space Sciences, 2023 We previously identified an event in the solar timeline that appeared to play a role in how sunspot Cycle 23 (SC23) transitioned into sunspot Cycle 24 (SC24). The timeframe for this transition was rapid, taking place over a very short time and perhaps in
Scott W. McIntosh +3 more
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Journal of Space Weather and Space Climate, 2023 On a centennial timescale, solar activity oscillates quasi-periodically and also tends to occasionally get into a low-activity period. The Dalton Minimum (circa 1790s–1820s) was one of such low-activity periods that had been captured in telescopic ...
Hayakawa Hisashi +3 more
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Relative Sunspot Number Observed from 2002 to 2011 at ButterStar Observatory [PDF]
Journal of Astronomy and Space Sciences, 2012 The ButterStar Observatory at the Dongducheon High School has been working for photographic observations of the Sun since October 16, 2002. In this study, we observed the Sun at the ButterStar observatory for 3,364 days from October 16, 2002 to December ...
Sung-Jin Oh, Heon-Young Chang
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