TY - JOUR
T1 - Bootstrapping Swarm and observatory data to generate candidates for the DGRF and IGRF-13
AU - Pavón-Carrasco, F. Javier
AU - Marsal, Santiago
AU - Torta, J. Miquel
AU - Catalán, Manuel
AU - Martín-Hernández, Fátima
AU - Tordesillas, J. Manuel
N1 - Funding Information:
The authors are grateful to the Spanish research project PGC2018-099103-A-I00 of the Spanish Ministry of Science, Innovation and Universities. We would like to thank the editors of this special issue and two anonymous reviewers for their useful comments. We are also grateful to the task force team of the Working Group V of IAGA for promoting and evaluating the IGRF-13 candidates. We also thank ESA for providing the Swarm Level-1b data. This work has used geomagnetic observatory data and we thank all the research institutions and observatories that provide these data, most of them supported by the INTERMAGNET network. Finally, a special dedication to all the people who are suffering the present pandemic situation, and in particular to all of them working for us while we rest at home.
Funding Information:
This work has been funded by the project PGC2018-099103-A-I00 entitled “Candidato Español para Campo Geomagnético de Referencia Internacional 2020” under the umbrella of the programme “I + D de Generación de Conocimiento” of the Spanish Ministry of Science, Innovation and Universities. Acknowledgements
Publisher Copyright:
© 2020, The Author(s).
PY - 2020/12/1
Y1 - 2020/12/1
N2 - As posted by the Working Group V of the International Association of Geomagnetism and Aeronomy (IAGA), the 13th generation of the International Geomagnetic Reference Field (IGRF) has been released at the end of 2019. Following IAGA recommendations, in this work we present a candidate model for the IGRF-13, for which we have used the available Swarm satellite and geomagnetic observatory ground data for the last year. In order to provide the IGRF-13 candidate, we have extrapolated the Gauss coefficients of the main field and its secular variation to January 1st, 2020. In addition, we have generated a Definitive Geomagnetic Reference Field model for 2015.0 using the same modelling approach, but focussed on a 1-year time window of data centred on 2015.0. To jointly model both satellite and ground data, we have followed the classical protocols and data filters applied in geomagnetic field modelling. Novelty arrives from the application of bootstrap analysis to solve issues related to the inhomogeneity of the spatial and temporal data distributions. This new approach allows the estimation of not only the Gauss coefficients, but also their uncertainties.[Figure not available: see fulltext.].
AB - As posted by the Working Group V of the International Association of Geomagnetism and Aeronomy (IAGA), the 13th generation of the International Geomagnetic Reference Field (IGRF) has been released at the end of 2019. Following IAGA recommendations, in this work we present a candidate model for the IGRF-13, for which we have used the available Swarm satellite and geomagnetic observatory ground data for the last year. In order to provide the IGRF-13 candidate, we have extrapolated the Gauss coefficients of the main field and its secular variation to January 1st, 2020. In addition, we have generated a Definitive Geomagnetic Reference Field model for 2015.0 using the same modelling approach, but focussed on a 1-year time window of data centred on 2015.0. To jointly model both satellite and ground data, we have followed the classical protocols and data filters applied in geomagnetic field modelling. Novelty arrives from the application of bootstrap analysis to solve issues related to the inhomogeneity of the spatial and temporal data distributions. This new approach allows the estimation of not only the Gauss coefficients, but also their uncertainties.[Figure not available: see fulltext.].
KW - Geomagnetic field
KW - Geomagnetic field modelling
KW - Geomagnetic observatories
KW - IGRF
KW - Secular variation
KW - Swarm
UR - http://www.scopus.com/inward/record.url?scp=85093105619&partnerID=8YFLogxK
U2 - 10.1186/s40623-020-01198-y
DO - 10.1186/s40623-020-01198-y
M3 - Article
AN - SCOPUS:85093105619
SN - 1343-8832
VL - 72
JO - Earth, Planets and Space
JF - Earth, Planets and Space
IS - 1
M1 - 152
ER -