Michel Menvielle

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We present a practical algorithm for determining the Bayesian solution of non-linear inverse problems with a limited number of parameters. This approach allows the use of very general conditional probability density functions (pdfs of the data given the model parameters) and a priori pdfs (prior beliefs upon the parameters). The results consist in the a(More)
Geomagnetic indices are basic data in Solar-Terrestrial physics, and for operational Space Weather activities. The International Service of Geomagnetic Indices (ISGI) is in charge of the derivation and dissemination of geomagnetic indices that are acknowledged by the International Association of Geomagnetism and Aeronomy (IAGA, an IUGG association).(More)
The K index was devised by Bartels et al. (1939) to provide an objective monitoring of irregular geomagnetic activity. The K index was then routinely used to monitor the magnetic activity at permanent magnetic observatories as well as at temporary stations. The increasing number of digital and sometimes unmanned observatories and the creation of INTERMAGNET(More)
' Equipe de Physique de la Terre et des Plandtes (URA 7369), Bat. 504, Abstract: The transient variations of the ntagnetjc field at the surface of a planet has a primary externa/ source, the interaction between the environment of the pkmet and solar radiation, and a secondary source, the electric currents induced in the conductive p!anet. The continuous(More)
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