Citation: Soler-Arechalde AM, Goguitchaichvili A, Carrancho Á, Sedov S, Caballero-Miranda CI, Ortega B, Solis B, Morales Contreras JJ, Urrutia-Fucugauchi J and Bautista F (2015) A detailed paleomagnetic and rock-magnetic investigation of the Matuyama-Brunhes geomagnetic reversal recorded in the tephra-paleosol sequence of Tlaxcala (Central Mexico). Front. Earth Sci. 3:11. doi: 10.3389/feart.201...

This paper proposes a method for detecting geomagnetic sudden commencement (SC) from a geomagnetic horizontal (H) component b y using lifting wavelet lters. Lifting wavelet lters are biorthog-onal wavelet lers containing free parameters. Our method is to learn such free parameters based on some training signals which c o n tain the SC. The learnt w avelet lters have the feature of training sign...

The XIVth IAGA Workshop on Geomagnetic Observatory Instruments, Data Acquisition, and Processing was the first of its kind to take place in China, the country regarded as the birthplace of geomagnetism. These workshops are scheduled to take place every 2 years, and as such, it is an important meeting for all magnetic observatories to attend. These workshops serve to provide the standard of obse...

To stimulate the discussion about possible reasons for whale strandings, we suggest solar driven geomagnetic variations as one further explanation for this phenomenon. Following this hypothesis that whales may strand due to geomagnetic disturbances we compared annual means of stranding event numbers of sperm whales (Physeter macrocephalus) along the North Sea coasts with yearly averaged numbers...

The geomagnetic activity of the Dst index is analyzed using wavelet transforms and it is shown that the Dst index possesses properties associated with self-affine fractals. For example, the power spectral density obeys a powerlaw dependence on frequency, and therefore the Dst index can be viewed as a self-affine fractal dynamic process. In fact, the behaviour of the Dst index, with a Hurst expo...

The Dst index is a key parameter which characterises the disturbance of the geomagnetic field in magnetic storms. Modelling of the Dst index is thus very important for the analysis of the geomagnetic field. A data-based modelling approach, aimed at obtaining efficient models based on limited inputoutput observational data, provides a powerful tool for analysing and forecasting geomagnetic activ...

Local scaling and singularity properties of solar wind and geomagnetic time series were analysed using Hölder exponents α. It was shown that in analysed cases due to multifractality of fluctuations α changes from point to point. We argued there exists a peculiar interplay between regularity / irregularity and amplitude characteristics of fluctuations which could be exploited for improvement of ...

The geospace is very sensitive to solar and geomagnetic activity, to changes in these activities and its manifestations in the near-Earth space environment and on the Earth. The Sun, as the origin of visible and invisible influence, poses a health and safety threat to humans and all kinds of human activities. This paper describes recently obtained results of cross-disciplinary heliobiological s...

The effects of thermospheric winds and electric fields on the ionospheric FZlayer are controlled by the geometry of the magnetic field, and so vary with latitude and longitude. We adopt a simple model of the daytime F2-layer and study the effects at midlatitudes (25O-65” geographic) of three processes that accompany geomagnetic storms : (i) thermospheric changes due to aurora1 heating; (ii) equ...

The analysis of the f oF2 ionosonde data acquired at mid and high latitudes reveals a general decreasing of the F2 plasma frequency over more than two solar cycles, showing steeper trends over the high latitude stations and, in particular, over Antarctica. A careful analysis of the f oF2 hourly data, opportunely catalogued in different levels of magneto-ionospheric conditions, highlights the ro...