A5091790174- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- Geophysical and Geoelectrical Methods
- Earthquake Detection and Analysis
- Ionosphere and magnetosphere dynamics
- Geological and Geophysical Studies
- Solar and Space Plasma Dynamics
- Planetary Science and Exploration
- Geology and Paleoclimatology Research
- Astro and Planetary Science
- Inertial Sensor and Navigation
- Reservoir Engineering and Simulation Methods
- Statistical and numerical algorithms
- Scientific Research and Discoveries
- Spacecraft Design and Technology
- Seismic Imaging and Inversion Techniques
- Geochemistry and Geologic Mapping
- Magnetic Field Sensors Techniques
- earthquake and tectonic studies
- Hydrocarbon exploration and reservoir analysis
- High-pressure geophysics and materials
- Space Science and Extraterrestrial Life
- Geophysical Methods and Applications
- NMR spectroscopy and applications
- Space exploration and regulation
Institut de physique du globe de Paris
2004-2023
Université Paris Cité
2004-2023
Centre National de la Recherche Scientifique
2004-2023
University of Potsdam
2009-2020
GFZ Helmholtz Centre for Geosciences
2007-2019
Sorbonne Paris Cité
2016-2018
Délégation Paris 7
2015-2016
Centre de Géosciences
2009
British Geological Survey
2002-2007
National Oceanic and Atmospheric Administration
2005
The 12th generation of the International Geomagnetic Reference Field (IGRF) was adopted in December 2014 by Working Group V-MOD appointed Association Geomagnetism and Aeronomy (IAGA). It updates previous IGRF with a definitive main field model for epoch 2010.0, 2015.0, linear annual predictive secular variation 2015.0-2020.0. Here, we present equations defining model, provide spherical harmonic coefficients, maps magnetic declination, inclination, total intensity 2015.0 their predicted rates...
The eleventh generation of the International Geomagnetic Reference Field (IGRF) was adopted in December 2009 by Association Geomagnetism and Aeronomy (IAGA) Working Group V-MOD.It updates previous IGRF with a definitive main field model DGRF 2005.0, for 2010.0, linear predictive secular variation 2010.0-2015.0.In this note equations defining are provided together spherical harmonic coefficients generation.Maps magnetic Declination, Inclination Total Intensity epoch 2010.0 their predicted...
Abstract In December 2019, the International Association of Geomagnetism and Aeronomy (IAGA) Division V Working Group (V-MOD) adopted thirteenth generation Geomagnetic Reference Field (IGRF). This IGRF updates previous with a definitive main field model for epoch 2015.0, 2020.0, predictive linear secular variation 2020.0 to 2025.0. letter provides equations defining IGRF, spherical harmonic coefficients this model, maps magnetic declination, inclination total intensity their predicted rate...
Swarm, a three-satellite constellation to study the dynamics of Earth’s magnetic field and its interactions with Earth system, is expected be launched in late 2013. The objective Swarm mission provide best ever survey geomagnetic temporal evolution, order gain new insights into system by improving our understanding interior environment. In derive advanced models (and other higher-level data products) it necessary take explicit advantage aspect Swarm. SCARF (SatelliteConstellationApplication...
Abstract We present a model of the lithospheric magnetic field Mars which is based on Global Surveyor orbiting satellite data and represented by an expansion spherical harmonic (SH) functions up to degree order 110. Several techniques were applied in obtain reliable well‐resolved Martian field: A modified Huber‐Norm was used properly treat outliers, mapping phase orbit weighted priori analysis data, static external fields treated joint inversion internal fields. Further, temporal...
In this paper the new GFZ Reference Internal Magnetic Model (GRIMM) is presented. The model has been derived from nearly 6 yr of CHAMP satellite data and 5 observatory hourly means. At high latitudes, full vector are used at all local times which allows a separation between, on one hand, fields generated by ionosphere field aligned currents, and, other in Earth's core lithosphere. This selection technique leads to set without gaps during polar summers resulting that an unprecedented time...
The World Digital Anomaly Map (WDMAM) is a worldwide compilation of near-surface magnetic data. We present here candidate for the second version WDMAM and its characteristics. This has been evaluated by group independent reviewers adopted as official during 26th general assembly International Union Geodesy Geomagnetism (IUGG). way this built described with some details. A global field model lithosphere contribution, parameterised spherical harmonics, derived up to degree order 800....
We present the second generation of GFZ Reference Internal Magnetic Model (GRIMM-2), that was derived for preparation candidate 11th IGRF. The model is built by fitting a vector data set made CHAMP satellite and observatory data, spanning period 2001.0 to 2009.5. selection technique parametrization are similar used derivation GRIMM (Lesur et al., 2008). obtained robust over time span data. However, secular variation above spherical harmonic degree 13 becomes less controlled constrained...
Abstract Data from the first year of ESA's Swarm constellation mission are used to derive Initial Field Model (SIFM), a new model Earth's magnetic field and its time variation. In addition conventional observations provided by each three satellites, explicit advantage is taken aspect including east‐west intensity gradient information lower satellite pair. Along‐track differences in provide further concerning north‐south gradient. The SIFM static shows excellent agreement (up at least degree...
The 12th revision of the International Geomagnetic Reference Field (IGRF) was issued in December 2014 by Association Geomagnetism and Aeronomy (IAGA) Division V Working Group V-MOD ( http://www.ngdc.noaa.gov/IAGA/vmod/igrf.html ). This comprises new spherical harmonic main field models for epochs 2010.0 (DGRF-2010) 2015.0 (IGRF-2015) predictive linear secular variation interval 2015.0-2020.0 (SV-2010-2015). were derived from weighted averages candidate submitted ten international teams....
Recent first principles calculations of the Earth's outer core thermal and electrical conductivities have raised their values by a factor three. This has significant implications for geodynamo operation, in particular, forcing development stably stratified layer at core–mantle boundary (CMB). study seeks to test hypothesis uppermost analysing geomagnetic observations made CHAMP satellite. An inversion method is utilized that jointly solves time-dependent main field surface flow, where we...
Evidence of fast variations in the Earth's core field are seen both magnetic observatory and satellite records. We present here how they have been identified at surface from ground-based records their spatio-temporal structure is now characterised by data. It shown properties mantle boundary extracted through localised global modelling processes, paying particular attention to time scales. Finally listed possible types waves liquid outer core, together with main properties, that may give...
The International Association of Geomagnetism and Aeronomy (IAGA) on 2004 December 12 has released the 10th-Generation Geomagnetic Reference Field—the latest version a standard mathematical description Earth's main magnetic field used widely in studies deep interior, its crust, ionosphere magnetosphere. coefficients were finalized by task force IAGA. IGRF is product large collaborative effort between modellers institutes involved collecting disseminating data from satellites observatories...
A spherical harmonic degrees 60, global internal field model is described (called BGS/G/L/0706). This includes a degree 15 core and piecewise-linear secular variation derived from quiet-time Ørsted Champ satellite data sampled between 2001.0 2005.0. For the selection, wide range of geomagnetic index other selection filters have been used to best isolate suitably quiet magnetospheric ionospheric conditions. Only relatively simple, one harmonic, external then required. It found that new...
Abstract We propose a reduced dynamical system describing the coupled evolution of fluid flow and magnetic field at top Earth's core between years 1900 2014. The is modeled with first‐order autoregressive process, while obeys classical frozen flux equation. An ensemble Kalman filter algorithm serves to constrain dynamics geomagnetic its secular variation given by COV‐OBS.x1 model. Using large 40,000 members provides meaningful statistics including reliable error estimates. model highlights...
We present the in-flight scalar calibration and characterisation of Swarm magnetometry package consisting absolute magnetometer, vector spacecraft structure supporting instruments. A significant improvement in residuals between pairs magnetometers is demonstrated, confirming high performance these The results presented here, including a Sun-driven disturbance field, form basis correction magnetic measurements from which applied to Level 1b data.
Patterns of the magnetic signature ionospheric currents, generated from an empirical model based on satellite observations, are used to build a statistical correlation for fields. In order stabilize dynamics and take into account dominant role sun, fields represented in solar coordinates. The covariance structure is analyzed second process that approximates full generated. We show synthetic data observations located at Earth observatories, field pattern as observed earth surface can be...
Abstract. A new magnetic observatory has been set on La Réunion island in the Indian Ocean through a collaboration between "Institut de physique du globe Paris" (IPGP) local volcano (OVPF) and its service. This is isolated serves for monitoring evolution of field that region. It also particularly useful large scale modelling core other contributions to geomagnetic field. Three-component vector data are continuously collected at 1 Hz using fluxgate, while scalar 0.2 with proton magnetometer....
The International Association of Geomagnetism and Aeronomy has recently released the 9th-Generation Geomagnetic Reference Field—the latest version a standard mathematical description Earth's main magnetic field used widely in studies deep interior, its crust ionosphere magnetosphere. coefficients were finalized at XXIII General Assembly Union Geophysics Geodesy, held Sapporo Japan 2003 July. IGRF is product huge collaborative effort between modellers institutes involved collecting...
The conventional formulation of 3D Euler deconvolution assumes that the observed field in each window varies all directions. Where source is 2D, this assumption leads to production poorly constrained solutions. If problem a rank deficient normal equations matrix having an eigenvector associated with zero eigenvalue. This vector lies horizontal plane and pointing along strike direction, thus allowing for identification 2D structure its strike. Finding pseudoinverse via expansion allows...
To understand the dynamics of Earth's fluid, iron-rich outer core, only indirect observations are available. The magnetic field, originating mainly within and its temporal variations can be used to infer fluid motion at top on a decadal subdecadal time-scale. Gravity resulting from changes in mass distribution Earth may also occur same time-scales. Such include signature flow inside though they largely dominated by water cycle contributions. Our study is based 8 y high-resolution,...
Magnetic satellite data from the last decade allow to model geomagnetic secular acceleration, second time derivative of field, in a highly precise manner. Robust estimates acceleration (SA) are obtained by using order six B-Splines as representation field variability, which turn allows us estimate characteristic SA timescale, τSA. We confirm recent finding that τSA is 10 years and fairly independent spherical harmonic degree n. This contrasts with timescale variation τSV, decreasing function...