A 2015 International Geomagnetic Reference Field IGRF candidate model based on Swarm���s experimental absolute magnetometer vector mode dataReportar como inadecuado




A 2015 International Geomagnetic Reference Field IGRF candidate model based on Swarm���s experimental absolute magnetometer vector mode data - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

1 IPGP - Institut de Physique du Globe de Paris 2 DTU Space 3 CEA-LETI - Laboratoire d-Electronique et des Technologies de l-Information 4 CIRES - Cooperative Institute for Research in Environmental Sciences 5 CNES - Centre National d-Etudes Spatiales

Abstract : Each of the three satellites of the European Space Agency Swarm mission carries an absolute scalar magnetometer ASM that provides the nominal 1-Hz scalar data of the mission for both science and calibration purposes. These ASM instruments, however, also deliver autonomous 1-Hz experimental vector data. Here, we report on how ASM-only scalar and vector data from the Alpha and Bravo satellites between November 29, 2013 a week after launch and September 25, 2014 for on-time delivery of the model on October 1, 2014 could be used to build a very valuable candidate model for the 2015.0 International Geomagnetic Reference Field IGRF. A parent model was first computed, describing the geomagnetic field of internal origin up to degree and order 40 in a spherical harmonic representation and including a constant secular variation up to degree and order 8. This model was next simply forwarded to epoch 2015.0 and truncated at degree and order 13. The resulting ASM-only 2015.0 IGRF candidate model is compared to analogous models derived from the mission-s nominal data and to the now-published final 2015.0 IGRF model. Differences among models mainly highlight uncertainties enhanced by the limited geographical distribution of the selected data set essentially due to a lack of availability of data at high northern latitude satisfying nighttime conditions at the end of the time period considered. These appear to be comparable to differences classically observed among IGRF candidate models. These positive results led the ASM-only 2015.0 IGRF candidate model to contribute to the construction of the final 2015.0 IGRF model.

Keywords : Absolute vector magnetometer Swarm IGRF





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Fuente: https://hal.archives-ouvertes.fr/



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