Analysis of Sunspot Number Fluctuations
نویسندگان
چکیده
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/f behavior with α ≃ 0.8±0.2. The well known cycle of approximately 11 years, clearly present in the spectrum, does not produce a sensible distortion of that behavior. The eventual characterization of the sunspot time series as a fractal is analyzed by means of the detrended fluctuation analysis. The jump size distribution of the signal is also studied.
منابع مشابه
BHP 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 کاملBHP universality and gaussianity in sunspot numbers fluctuations
We analyze the famous Wolf’s sunspot numbers. We discovered that the distribution of the sunspot number fluctuations is a mixture of the BHP distribution with the Gaussian distribution.
متن کاملComparing Four Models of Aggregate Fluctuations due to Self-Fulfilling Expectations
This paper compares four equilibrium business cycle models with increasing returns to scale production technologies that allow for aggregate fluctuations due to self-fulfilling expectations. Necessary and sufficient conditions for the existence of stationary sunspot equilibria are derived. Numerical examples demonstrate that the degree of increasing returns necessary for the existence of statio...
متن کاملModeling a Maunder Minimum
We introduce on/off intermittency into a mean field dynamo model by imposing stochastic fluctuations in either the alpha effect or through the inclusion of a fluctuating electromotive force. Sufficiently strong small scale fluctuations with time scales of the order of 0.3-3 years can produce long term variations in the system on time scales of the order of hundreds of years. However, global sup...
متن کاملOn stabilization policy in sunspot-driven oligopolistic economies
Economies with oligopolistic markets are prone to inefficient sunspot fluctuations triggered by autonomous changes in firms equilibrium conjectures. We show that a well designed taxation-subsidization scheme can eliminate these fluctuations by coordinating firms in each sector on a single efficient equilibrium. At the macroeconomic level, implementing this stabilization policy leads to signific...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2004