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Earth, Planets and Space
Fig. 7 | Earth, Planets and Space

Fig. 7

From: Improvements and validation of the IRI UP method under moderate, strong, and severe geomagnetic storms

Fig. 7

Examples of effective index variograms and maps passing the NQCR selection procedure. (top left) Example of spherical variogram model which has passed the NQCR procedure and (top right) corresponding map of IG12eff on October 16, 2016, at 12:00 UT. (bottom left) Example of linear variogram model which has passed the NQCR procedure and (bottom right) corresponding map of R12eff on March 17, 2015, at 11:00 UT

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