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Earth, Planets and Space
Fig. 1 | Earth, Planets and Space

Fig. 1

From: The BGS candidate models for IGRF-13 with a retrospective analysis of IGRF-12 secular variation forecasts

Fig. 1

Distributions of selected satellite and ground data in space and time. Top: Map of ground observatory locations providing hourly mean vector data, those used as projected scalar values for locations above GMD latitude |55\(^\circ \)| are shown as open squares. Middle: Stacked histogram of data coverage in time, in 30 day bins. Solid bars show vector data, hollow bars show scalar data. Bottom: Distribution of all data types by GMD latitude and time; colours of data sources as in middle plot. Note the gaps in the Swarm data are due to the exclusion of orbits with local times between 05:00 and 23:00; Swarm A data mostly plot over Swarm C data due to the proximity of their orbits

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