منابع مشابه
Orbital tuning of geomagnetic polarity time-scales
Milankovitch climate cyclicity and magnetic polarity stratigraphy are being successfully combined as a powerful geochronometer in the astronomical polarity timescale (APTS). The APTS for 0–5.23 Ma has been rapidly accepted as the definitive chronology for the Pliocene and Pleistocene against which even high precision radiometric dating is now calibrated. Extensions of astronomical calibration t...
متن کاملSpurious Dimension Estimates From Time Series Of Geomagnetic Indice
time series. Notice the non–stationary mean and variance, especially the elevated mean during the fourth day, and the relatively quiet conditions during the later part of the fifth day. These short periods of high correlation may be leading to a spurious dimension estimate. Next we tried estimating the dimension of the attractor using the method of Termonia and Alexandrowicz (1983), but no scal...
متن کاملIntermittency and multifractional Brownian character of geomagnetic time series
The Earth’s magnetosphere exhibits a complex behavior in response to the solar wind conditions. This behavior, which is described in terms of mutifractional Brownian motions, could be the consequence of the occurrence of dynamical phase transitions. On the other hand, it has been shown that the dynamics of the geomagnetic signals is also characterized by intermittency at the smallest temporal s...
متن کاملNon-linear analysis of geomagnetic time series from Etna volcano
An intensive nonlinear analysis of geomagnetic time series from the magnetic network on Etna volcano was carried out to investigate the dynamical behavior of magnetic anomalies in volcanic areas. The short-term predictability of the geomagnetic time series was evaluated to establish a possible low-dimensional deterministic dynamics. We estimated the predictive ability of both a nonlinear foreca...
متن کاملSpurious Dimension Estimates from Time Series of Geomagnetic Indices
1623 Abstract. The tools of nonlinear systems analysis can be used to determine the number of effective degrees of freedom, or dimension, of a system. The algorithms for estimating the dimension appear deceptively simple, but must be applied with extreme care or a spurious dimension estimate is likely to result. We discuss various problems, and methods to overcome them, with estimating the dime...
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ژورنال
عنوان ژورنال: Geophysical Journal of the Royal Astronomical Society
سال: 2007
ISSN: 0016-8009
DOI: 10.1111/j.1365-246x.1963.tb06291.x