Rapid modelling of the large-scale magnetospheric field from Swarm satellite data

Hamilton, Brian

doi:10.5047/eps.2013.09.003

Cited by 23 publications

(26 citation statements)

References 20 publications

(18 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a consequence, it is preferable to use either the full CI model or a dedicated core field model together with an additional model for the ionospheric field , to ensure that the contribution of the ionosphere induced in the Earth's mantle is also corrected for. Additional magnetospheric field corrections can then also be implemented based on the so-called Model of the MAgnetosphere (MMA) SH model (Hamilton 2013). As an attractive alternative to the CI model the Dedicated COre field model (DCO) can, for instance, be used.…”

Section: Correction With Sh Modelsmentioning

confidence: 99%

“…Explicit models relying on the parameterization of the main internal and external fields in SH are most appropriate for such data correction. The Swarm processing chains developed within the SCARF consortium ) provide various models for these source fields (Hamilton 2013;Rother et al 2013;Sabaka et al 2013). However, data corrections based on models derived from different dataset Fig.…”

Section: Correction With Sh Modelsmentioning

confidence: 99%

See 1 more Smart Citation

A Swarm lithospheric magnetic field model to SH degree 80

et al. 2016

View full text Add to dashboard Cite

The Swarm constellation of satellites was launched in November 2013 and since then has delivered high-quality scalar and vector magnetic field measurements. A consortium of several research institutions was selected by the European Space Agency to provide a number of scientific products to be made available to the scientific community on a regular basis. In this study, we present the dedicated lithospheric field inversion model. It uses carefully selected magnetic field scalar and vector measurements from the three Swarm satellites between March 2014 and December 2015 and directly benefits from the explicit expression of the magnetic field gradients by the lower pair of Swarm satellites. The modeling scheme is a two-step one and relies first on a regional modeling approach that is very sensitive to small spatial scales and weak signals which we seek to describe. The final model is built from adjacent regional solutions and consists in a global spherical harmonics model expressed between degrees 16 and 80. The quality of the derived model is assessed through a comparison with independent models based on Swarm and the CHAMP satellites. This comparison emphasizes the high level of accuracy of the current model after only 2 years of measurements but also highlights the possible improvements which will be possible once the lowest two satellites reach lower altitudes.

show abstract

Section: Correction With Sh Modelsmentioning

confidence: 99%

Section: Correction With Sh Modelsmentioning

confidence: 99%

A Swarm lithospheric magnetic field model to SH degree 80

et al. 2016

View full text Add to dashboard Cite

show abstract

“…This latter field is in the usual earth fixed, earth centered system of coordinates (geocentric), and parametrized in time by an index controlling the rapid variations of the field. The external field index is preferentially the MMA Level 2 product (Hamilton, 2013). In case the MMA index is not available or found not to be appropriate, the DST index can be used alternatively.…”

Section: Model Parametrization and Estimationmentioning

confidence: 99%

“…MMA is the a time series of spherical harmonic model coefficients of the large-scale magnetospheric field and its Earth-induced counterparts (Hamilton, 2013); AUX DST is the name of a Swarm L2 Product with DST indices including quick-look and preliminary estimates from World Data Center for Geomagnetism in Kyoto, in listing format (Olsen et al, 2013); AUX IMF is the name of a Swarm L2 Product with the values of the Interplanetary Magnetic Field propagated to the Earth magnetosphere (Olsen et al, 2013).…”

Section: Selectionmentioning

confidence: 99%

An algorithm for deriving core magnetic field models from the Swarm data set

2013

View full text Add to dashboard Cite

In view of an optimal exploitation of the Swarm data set, we have prepared and tested software dedicated to the determination of accurate core magnetic field models and of the Euler angles between the magnetic sensors and the satellite reference frame. The dedicated core field model estimation is derived directly from the GFZ Reference Internal Magnetic Model (GRIMM) inversion and modeling family. The data selection techniques and the model parameterizations are similar to what were used for the derivation of the second (Lesur et al., 2010) and third versions of GRIMM, although the usage of observatory data is not planned in the framework of the application to Swarm. The regularization technique applied during the inversion process smoothes the magnetic field model in time. The algorithm to estimate the Euler angles is also derived from the CHAMP studies. The inversion scheme includes Euler angle determination with a quaternion representation for describing the rotations. It has been built to handle possible weak time variations of these angles. The modeling approach and software have been initially validated on a simple, noise-free, synthetic data set and on CHAMP vector magnetic field measurements. We present results of test runs applied to the synthetic Swarm test data set.

show abstract

“…Only one model, derived from the Comprehensive Inversion chain (MMA SHAi2C) will be validated, though a second 'fast- track' model (MMA SHA 2F) is issued on a daily basis (Hamilton, 2013). The CI model describes the time-varying (external) magnetospheric field up to degree L = 3 and order m = 1 with a cadence of ninety minutes for the dipole terms and six hours for the non-dipole terms .…”

Section: Magnetospheric Fieldmentioning

confidence: 99%

Independent validation of Swarm Level 2 magnetic field products and ‘Quick Look’ for Level 1b data

et al. 2013

Self Cite

View full text Add to dashboard Cite

Magnetic field models are produced on behalf of the European Space Agency (ESA) by an independent scientific consortium known as the Swarm Satellite Constellation Application and Research Facility (SCARF), through the Level 2 Processor (L2PS). The consortium primarily produces magnetic field models for the core, lithosphere, ionosphere and magnetosphere. Typically, for each magnetic product, two magnetic field models are produced in separate chains using complementary data selection and processing techniques. Hence, the magnetic field models from the complementary processing chains will be similar but not identical. The final step in the overall L2PS therefore involves inspection and validation of the magnetic field models against each other and against data from (semi-) independent sources (e.g. ground observatories). We describe the validation steps for each magnetic field product and the comparison against independent datasets, and we show examples of the output of the validation. In addition, the L2PS also produces a daily set of 'Quick Look' output graphics and statistics to monitor the overall quality of Level 1b data issued by ESA. We describe the outputs of the 'Quick Look' chain.

show abstract

Rapid modelling of the large-scale magnetospheric field from Swarm satellite data

Cited by 23 publications

References 20 publications

A Swarm lithospheric magnetic field model to SH degree 80

A Swarm lithospheric magnetic field model to SH degree 80

An algorithm for deriving core magnetic field models from the Swarm data set

Independent validation of Swarm Level 2 magnetic field products and ‘Quick Look’ for Level 1b data

Contact Info

Product

Resources

About