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The International Service of Geomagnetic Indices (ISGI) is in charge of the elaboration and dissemination of geomagnetic indices, and of tables of remarkable magnetic events, based on the report of magnetic observatories distributed all over the planet, with the help of ISGI Collaborating Institutes. The interaction between the solar wind, including plasma and interplanetary magnetic field, and the Earth's magnetosphere results in a transfer of energy and particles inside the magnetosphere. Solar wind characteristics are highly variable, and they have actually a direct influence on the shape and size of the magnetosphere, on the amount of transferred energy, and on the way this energy is dissipated. It is clear that the great diversity of sources of magnetic variations give rise to a great complexity in ground magnetic signatures. Geomagnetic indices aim at describing the geomagnetic activity or some of its components. Each geomagnetic index is related to different phenomena occurring in the magnetosphere, ionosphere and deep in the Earth in its own unique way. The location of a measurement, the timing of the measurement and the way the index is calculated all affect the type of phenomenon the index relates to. The IAGA endorsed geomagnetic indices and lists of remarkable geomagnetic events constitute unique temporal and spatial coverage data series homogeneous since middle of 19th century.
This website constitutes a repository of tools and resources for researchers and teachers that are interested in second language speech acquisition and pronunciation teaching in diverse educational contexts. If you are a RESEARCHER in the field of second language acquisition (SLA), here you will find a wide range of validated tools that may be useful for your individual differences, SLA or L2 speech studies. If you are a passionate second language pronunciation TEACHER interested in communicative methods, here you will be able to download several carefully designed explicit instruction, communicative form-focused activities and pronunciation-based tasks that are ready to be used in your classroom