Abstract
Abstract Two geomagnetic main-field models for epochs 1995.0 and 2000.0 were proposed as candidate models for DGRF 1995 and DGRF 2000. A main-field model was derived for epoch 2000.0, using the high-quality data provided by the Ørsted satellite around this epoch. Since no high-quality satellite vector measurements of the magnetic field were acquired between 1980 and 1999, our approach was to extrapolate this 2000.0 accurate model back to 1995. To do this we produced a secular-variation model for the time-span 1995-2000, from ground measurements. The models obtained were incorporated into DGRF 1995 and DGRF 2000 as part of the 9th generation of the IGRF in 2003.
Highlights
IntroductionThe launch of the Ørsted satellite has considerably changed the way magnetic models are constructed, or the way magnetic measurements are selected
The launch of the Ørsted satellite has considerably changed the way magnetic models are constructed, or the way magnetic measurements are selected.For the 8th generation of IGRF, main-field candidate models relied on spatially incomplete datasets, resulting in errors that were too large to be ignored
A main-field model was derived for epoch 2000.0, using the high-quality data provided by the Ørsted satellite around this epoch
Summary
The launch of the Ørsted satellite has considerably changed the way magnetic models are constructed, or the way magnetic measurements are selected. Due to the very large number of magnetic measurements, it is possible to apply very strict data selection criteria. In this context, we chose to derive a model for epoch 2000.0 from selected measurements provided by the Ørsted satellite at the time of this study. We chose to derive a model for epoch 2000.0 from selected measurements provided by the Ørsted satellite at the time of this study This model was extrapolated back to epoch 1995.0 using a secular-variation model derived from monthly mean observatory data. Our candidate main-field model for DGRF 2000 was computed using selected vector and scalar one-second measurements of Ørsted satellite mission, over the 1999–2002 period. C The Society of Geomagnetism and Earth, Planetary and Space SciCopyright ences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
