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Conference Paper

The potential of Geomagnetic Virtual Observatories with NanoMagSat

Authors

Brown,  William
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Gomez Perez,  Natalia
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Beggan,  Ciaran
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Hammer,  Magnus
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Finlay,  Chris
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Hulot,  Gauthier
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Brown, W., Gomez Perez, N., Beggan, C., Hammer, M., Finlay, C., Hulot, G. (2023): The potential of Geomagnetic Virtual Observatories with NanoMagSat, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3072


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020328
Abstract
Geomagnetic Virtual Observatories (GVOs) are a method for processing magnetic satellite data in order to simulate the observed behaviour of the geomagnetic field at a static location. Data are collected in a volume of space over a period of time and reduced, via the fitting of a local potential field model, to a point estimate. As low-Earth orbit satellites move very quickly but have an infrequent re-visit time to the same location, a trade off must be made between spatial and temporal resolution. Geomagnetic satellites in polar orbits that drift slowly in local time see uneven sampling of local time dependent signals unless data are gathered over a period as long as the local time drift rate. For example, four months and a radius of influence of 700km was chosen for the ESA Swarm mission.The proposed NanoMagSat constellation would include two satellites at 60° inclined orbits, and one in a near-polar orbit. The inclined orbits would provide comparatively rapid local time coverage at mid-to-low latitudes, in theory allowing GVOs to sample every three weeks compared to seventeen weeks for Swarm. We present the results of calculating GVOs from simulated NanoMagSat mission data and compare to the standard of Swarm GVOs.