منابع مشابه
Objective Calibration of Sunspot Numbers
Waldmeier [1971] found a very tight relationship between the F10.7 solar radio flux and the sunspot number and suggested using the flux for an objective calibration of the sunspot number. He suggested that if this relationship changed later on, the sunspot number should be recalibrated, assuming that the calibration must have drifted with time. I repeat his analysis using data up to the present...
متن کاملThe shape of the sunspot cycle described by sunspot areas
The temporal behavior of the sunspot cycles 12–22, as described by quarterly mean values of sunspot areas, can be represented by a single function containing only two parameters: the starting time and the amplitude of a cycle. The parameters are determined for the more recent 11 sunspot cycles and examined for any predictable behavior. As a sunspot cycle progresses, the amplitude parameter can ...
متن کاملBHP universality in sunspot numbers fluctuations
We analyze the famous Wolf’s sunspot numbers. The time series shows a mean period with duration of 133 months. We observed that the mean period consists of two equal sized phases, descendent and ascendent, that can be well fitted by two ortogonal lines. The sunspot numbers standard deviation period is well fitted by a sine function. We discovered that the distribution of the sunspot number fluc...
متن کاملForecasting Sunspot Numbers with Neural Networks
This paper presents a feedforward neural network approach to sunspot forecasting. The sunspot series were analyzed with feedforward neural networks, formalized based on statistical models. The statistical models were used as comparison models along with recurrent neural networks. The feedforward networks had 24 inputs (depending on the number of predictor variables), one hidden layer with 20 ...
متن کاملSunspot Cycle: A Driven Nonlinear Oscillator?
A property of nonlinear oscillators—mutual dependence between their instantaneous amplitude and frequency—is tested in the yearly and monthly records of the sunspot numbers using the histogramadjusted isospectral surrogate data and the Barnes model as the autoregressive moving average surrogates. The instantaneous amplitudes and frequencies are obtained by means of the analytic signal approach ...
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ژورنال
عنوان ژورنال: Nature
سال: 1959
ISSN: 0028-0836,1476-4687
DOI: 10.1038/1841787a0