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Geomagnetic storm severity info (K-Index) NOAA / Space Weather Prediction Center The K-index is a code that is related to the maximum fluctuations of horizontal components observed on a magnetometer relative to a quiet day, during a three-hour interval. The conversion table from maximum fluctuation (nT) to K-index, varies from observatory to observatory in such a way that the historical rate of occurrence of certain levels of K are about the same at all observatories.
Aster - Archives Aster devient Recherches en didactiques des sciences et des technologies à compter de janvier 2010. La revue Aster contribue au développement de la recherche en didactique des sciences et à la diffusion des connaissances qui permettent de mieux comprendre les situations d’enseignement-apprentissage, les contenus d’enseignement et l’organisation des plans d’étude. Elle s’intéresse aux processus d’accès aux savoirs, à la construction de compétences par les élèves et les étudiants, et à la professionnalisation des enseignants et des formateurs, tant dans des situations d'éducation formelle que non formelle. For Students- Stanford Solar Center Activities for Students You cannot teach a man anything, you can only help him to find it for himself. -Galileo Galilei Tour through these topics to find exciting activities, images, interactive tools, text, and other resources to let you research our special star -- the Sun. Check out our new comics series! Design Your Own Solar Cupcakes! Build an SDO Hexaflexagon!
SOLARCYCLE 24.com / SolarHam.com / Solar Cycle 24 / Spaceweather / Amateur Radio VHF Aurora Website / Sunspots / Solar Flares Free Books : Download & Streaming : Ebook and Texts Archive : Internet Archive Additional collections of scanned books, articles, and other texts (usually organized by topic) are presented here. United States Patent and Trademark Office documents contributed by Think Computer Foundation. Topic: U.S Patent The American Libraries collection includes material contributed from across the United States. Institutions range from the Library of Congress to many local public libraries.
Speed of the Earth's Rotation The Question (Submitted April 01, 1997) I am trying to find out the speed of the turning of the Earth. The Answer SECCHI - Solar Physics Branch - Naval Research Laboratory Science.gouv.fr STEREO Enseigner les Sciences, EE et EDD - Réseau social du Laboratoire de Didactique et d'Epistémologie des Sciences