M. Menvielle

National Space Activities Commission

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Pascal Tarits

Centre National de la Recherche Scientifique

V. Dehant

UCLouvain

Philippe Lognonné

Université Paris Cité

B. Schmieder

Observatoire de Paris

Christine Amory‐Mazaudier

Laboratoire de Physique des Plasmas

C. Lathuillère

Centre National de la Recherche Scientifique

A. Mocquet

Nantes Université

Mioara Mandéa

Centre National d'Études Spatiales

J. J. Berthelier

Laboratoire atmosphères, milieux, observations spatiales

F. Primdahl

Technical University of Denmark

Cooperative Institutions

Centre National de la Recherche Scientifique

169

Sorbonne Université

Université Paris Cité

Institut de physique du globe de Paris

Université de Versailles Saint-Quentin-en-Yvelines

Jet Propulsion Laboratory

Centre National d'Études Spatiales

Université Paris-Saclay

Institut Pierre-Simon Laplace

Goddard Space Flight Center

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Geomagnetic data 1996

HAL (Le Centre pour la Communication Scientifique Directe) (2006)

M. Menvielle

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Mars interior models.

HAL (Le Centre pour la Communication Scientifique Directe) (2005)

A. Rivoldini O. Verhoeven T. van Hoolst A. Mocquet G. Choblet

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On the long term change in the geomagnetic activity during the 20th century

Annales Geophysicae (2009)

Frédéric Ouattara Christine Amory‐Mazaudier M. Menvielle P. A. Simon Judith Legrand

Abstract. The analysis of the aa index series presented in this paper clearly shows that during the last century (1900 to 2000) the number of quiet days (Aa<20 nT) drastically diminished from a mean annual value greater than 270 days per year at the end of the nineteenth century to a mean value of 160 quiet days per year one hundred years later. This decrease is mainly due to the decrease of the number of very quiet days (Aa<13 nT). We show that the so-evidenced decrease in the number of quiet days cannot be accounted for by drift in the aa baseline resulting in a systematic underestimation of aa during the first quarter of the century: a 2–3 nT overestimation in the aa increase during the 20th century would lead to a 20–40% overestimation in the decrease of the number of quiet days during the same period. The quiet days and very quiet days correspond to periods during which the Earth encounters slow solar wind streams flowing in the heliosheet during the period where the solar magnetic field has a dipolar geometry. Therefore, the observed change in the number of quiet days is the signature of a long term evolution of the solar coronal field topology. It may be interpreted in terms of an increase in the magnitude of the solar dipole, the associated decrease of the heliosheet thickness accounting for the observed decrease in the number of quiet days.

QUIET

10.5194/angeo-27-2045-2009

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3D inversion of MT data using Bayesian statistics

Viacheslav V. Spichak M. Menvielle Michel Roussignol

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Paleoclimate investigation based on magnetic and electric properties of sediments in the basin of Lake Ferto (Neusiedlersee)

5th EEGS-ES Meeting (1999)

A. Jelinowskal M. Menvielle László Szarka P. Tucholkal B. V. Wesztergom

Lake Ferto (Neusiedlersee) (309 km2) is located on the Austro-Hungarian border south (20 km) of the Danube. It is a shallow (average water depth 50 - 60 cm) water body with large water level fluctuations over the historical period. More than one-third of its surface is now overgrown with uliginal plants. The age of the lake is estimated to be nearly 20 kyr and its origin is related to the simultaneous formation of Hanság and Ferto basins. Large depositions of gravel and sands by Danube and Rába rivers at the end of Pleistocene formed a barrier separating the two basins. During high water periods the two basins were frequently connected. The lake is supplied by local rainfall (78%) and the Vulka and Rákos rivers (20%); groundwater feed represents 2% (Boroviczényi et al 1992). In its natural state lake Ferto has no outlet, its water level is regulated by the discharge through the Hanság channel. Lake Ferto is a part of the Ferto-Hansag (Neusiedler See - Seewinkel) National Park. After some former geophysical experiments (e.g. Fritsch, 1961, Ádám et al 1964, then Kohlbeck et al 1993, 1994) the present study of the area of lake Ferto (Neusiedlersee) is being carried out since 1997 with an aim to understand the past of its basin and environment during the post-glacial period, its actual state and possibly future evolution. Physical properties of sediments measured from the surface (resistivity by geoelectric end electromagnetic methods) and directly from cores are investigated. Preliminary study was realised in 1997 in 6 sites using short (up to 3.5 m) hand-drilled cores and vertical electric soundings. It has shown by comparison of high precision electrical sounding (20 data/decade, millimetre range geometry of electrode positioning for AB distances shorter than 6.4 m; a combination of potential electrodes at the surface and at a depth of 40 cm) with direct measurements of physical parameters (resistivity, water content and low field magnetic susceptibility) on the cores that although very thin sedimentary layers and local inhomogenities cannot be identified by surface measurements, the geoelectric inversion methods allowing smooth layer transitions and stochastic Bayesian method provide a realistic model of the subsurface structure while classical few-layer inversion techniques fail (Kohlbeck et al 1999). Variation of some environmental parameters in sediments were investigated using changes of magnetic minerals which reflect variation in salinity and organic material contents in waters and sediments of the lake and therefore give information about the evolution of hydrogeological system of the lake basin (Jelinowska et al 1999).

10.3997/2214-4609.201406458

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Réinterprétation par inversion bayésienne des sondages électriques sur le lac Tritrivakely (Madagascar)

Heritiana A. Rakoto F. Ranaivo-Nomenjanahary J.B. Ratsimbazafy Yves Albouy Jonathan Schott

The aim of this study is to interpret data from vertical electrical soundings using bayesian approach of the 1D inverse problem. Two orthogonal Shlumberger soundings were carried out on the lake Tritrivakely. By classical interpretation, thickness of first conductive layers is underestimated. Bayesian inversion method is efficient for analysis of equivalence : using two or three layers models, we obtain a well constrained estimation on resistivity of conductive(s) layer(s) but a poorly constrained estimation on thickness. Bayesian inversion may be used also for giving a smooth model resistivity versus depth. Heritiana Rakoto1, Flavien Ranaivo-Nomenjanahary1, Jean-Bruno Ratsimbazafy1, Yves Albouy2, Jean-Jacques Schott3, Michel Menvielle4 1 Institut et Observatoire de Geophysique d’Antananarivo, B.P. 1473, Antananarivo, Madagascar 2 ORSTOM, Laboratoire de Geodynamique Interne, 32 avenue Henri Varagnat, 93143 Bondy cedex, France 3 Ecole et Institut de Physique du Globe, 5 rue Rene Descartes, 67084 Strasbourg cedex, France 4 Universite Paris Sud, Laboratoire de Geophysique et Geodynamique Interne, Bât. 504, 91405 Orsay cedex, France einterpretation par inversion bayesienne des sondages electriques sur le lac Tritrivakely (Madagascar)

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Synergies between the MagNet/NetLander experiment and a magnetic experiment onboard an orbiter

EGS - AGU - EUG Joint Assembly (2003)

M. Menvielle Mioara Mandéa F. Primdahl

Orbiter

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Bayesian Monte Carlo for MT tensor decomposition, in Protokoll über das Kolloquium Elektromagnetische Tiefenforschung.

HAL (Le Centre pour la Communication Scientifique Directe) (2005)

V. Cerv J. Pek M. Menvielle

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From the Sun to the Earth: impact of the 27-28 May 2003 solar events on the magnetosphere, ionosphere and thermosphere

Annales Geophysicae (2006)

C. Hanuise J.‐C. Cerisier F. Auchère K. Bocchialini Sean Bruinsma

Abstract. During the last week of May 2003, the solar active region AR 10365 produced a large number of flares, several of which were accompanied by Coronal Mass Ejections (CME). Specifically on 27 and 28 May three halo CMEs were observed which had a significant impact on geospace. On 29 May, upon their arrival at the L1 point, in front of the Earth's magnetosphere, two interplanetary shocks and two additional solar wind pressure pulses were recorded by the ACE spacecraft. The interplanetary magnetic field data showed the clear signature of a magnetic cloud passing ACE. In the wake of the successive increases in solar wind pressure, the magnetosphere became strongly compressed and the sub-solar magnetopause moved inside five Earth radii. At low altitudes the increased energy input to the magnetosphere was responsible for a substantial enhancement of Region-1 field-aligned currents. The ionospheric Hall currents also intensified and the entire high-latitude current system moved equatorward by about 10°. Several substorms occurred during this period, some of them - but not all - apparently triggered by the solar wind pressure pulses. The storm's most notable consequences on geospace, including space weather effects, were (1) the expansion of the auroral oval, and aurorae seen at mid latitudes, (2) the significant modification of the total electron content in the sunlight high-latitude ionosphere, (3) the perturbation of radio-wave propagation manifested by HF blackouts and increased GPS signal scintillation, and (4) the heating of the thermosphere, causing increased satellite drag. We discuss the reasons why the May 2003 storm is less intense than the October-November 2003 storms, although several indicators reach similar intensities.

Space Weather

Interplanetary scintillation

Electrojet

Dynamic pressure

Solar maximum

10.5194/angeo-24-129-2006

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Effects of crustal conductivity heterogeneities on the electromagnetic field

Surveys in Geophysics (1988)

M. Menvielle

Distortion (music)

Earth model

10.1007/bf01901628

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Citations (17)