Results 21 to 30 of about 13,690 (192)
Long-term variations in the geomagnetic activity level Part II: Ascending phases of sunspot cycles [PDF]
Annales Geophysicae, 1994 Monthly averages of the Helsinki Ak-values have been reduced to the equivalent aa-indices to extend the aa-data set back to 1844. A periodicity of about five cycles was found for the correlation coefficient (r) between geomagnetic indices and sunspot ...
V. Mussino +3 more
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The Contribution of a Geophysical Data Service: The International Service of Geomagnetic Indices
Data Science Journal, 2013 Geomagnetic indices are basic data in Solar-Terrestrial physics and in operational Space Weather activities. The International Service of Geomagnetic Indices (ISGI) is in charge of the derivation and dissemination of the geomagnetic indices that are ...
M Menvielle
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Comparison between indices during geomagnetic disturbances [PDF]
Geofísica Internacional, 2004 Auroral indices AE, AU, AL, and Troshichev index from Thule, PC (Polar Cap) are compared for geomagnetic disturbances of different intensities. To identify perturbations, the indices Dst and AE have been used. Fourteen storms have been analyzed, with Dst
Marta Zossi de Artigas +1 more
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Data Science Journal, 2020 This paper presents the results of the creation of a geomagnetic data storage system that combines raw observation data from different geomagnetic observation networks along with derived indices and indicators of geomagnetic activity.
Michael Dobrovolsky +2 more
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Solar, ionospheric and geomagnetic indices
Annals of Geophysics, 1998 The most common solar, ionospheric and geomagnetic indices are here presented with particular reference to their application for radiocommunication prediction purposes. Summary tables of practical use are also included concerning the method of derivation
G. De Franceschi, L. Perrone
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The Geomagnetic Kp Index and Derived Indices of Geomagnetic Activity
Space Weather, 2021 The geomagnetic Kp index is one of the most extensively used indices of geomagnetic activity, both for scientific and operational purposes. This article reviews the properties of the Kp index and provides a reference for users of the Kp index and ...
J. Matzka +4 more
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Deep Neural Networks With Convolutional and LSTM Layers for SYM‐H and ASY‐H Forecasting
Space Weather, 2021 Geomagnetic indices quantify the disturbance caused by the solar activity on a planetary scale or in particular regions of the Earth. Among them, the SYM‐H and ASY‐H indices represent the (longitudinally) symmetric and asymmetric geomagnetic disturbance ...
Armando Collado‐Villaverde +2 more
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A Detection Study of the Ionospheric Total Electron Contents Variations Using GPS Network [PDF]
Journal of Astronomy and Space Sciences, 2007 We established a regional ionospheric model for investigating ionospheric TEC (Total Electron Contents) variations over the Korean Peninsula during major geomagnetic storms.
Byung-Kyu Choi +2 more
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Journal of Space Weather and Space Climate, 2014 Extreme geomagnetic storms are considered as one of the major natural hazards for technology-dependent society. Geomagnetic field disturbances can disrupt the operation of critical infrastructures relying on space-based assets, and can also result in ...
Cid Consuelo +4 more
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Geomagnetic disturbances analysis using discrete wavelets [PDF]
Geofísica Internacional, 2008 To assess long-term trends and periodicities in geomagnetic storms, the discrete wavelet transform, using the Daubechies function, was applied. Among a variety of techniques, which are available for analyzing variability, wavelet analysis has emerged in ...
E. M. Zotto +2 more
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