Out-of-Cycle Update of the US/UK World Magnetic Model for 2015-2020

Chulliat, Arnaud; Brown, William; Alken, Patrick; Macmillan, Susan; Nair, Manoj; Beggan, Ciaran; Woods, Adam; Hamilton, Brian; Meyer, Brian; Redmon, Robert. 2019 Out-of-Cycle Update of the US/UK World Magnetic Model for 2015-2020. National Centers for Environmental Information, NOAA, 16pp. (OR/19/028)

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In early 2018, the World Magnetic Model 2015-2020 (WMM2015) was predicted to exceed its performance specification error tolerances by the end of 2018 or early 2019. Specifically, the grid variation root-mean-square error was about to exceed the 1 degree specification (MIL-PRF89500A) due to fast fluid flows in the Earth’s outer core, especially in the North polar region. An out-of-cycle update of the WMM2015 was developed and released in early 2019 (WMM2015v2) to address this performance degradation. There was a pre-release in September 2018 and this technical note confirms the information provided in that pre-release. It also provides a description of the new model (section 1), how it was produced (section 2) and its uncertainties (section 3). How to Use this Note: A complete description of the WMM2015 is provided in the WMM2015 Technical Report (Chulliat et al., 2015; WMM2015-TR hereafter ( This new technical note should be seen as an addendum to the WMM2015-TR. It is organized in the same manner as the WMM2015-TR in order to facilitate the retrieval of information by users. It only includes information that is new for the out-of-cycle update, hereafter referred to as WMM2015v2.

Item Type: Publication - Report
Digital Object Identifier (DOI):
Funders/Sponsors: National Centers for Environmental Information, NOAA, British Geological Survey
Additional Information. Not used in RCUK Gateway to Research.: This item has been internally reviewed, but not externally peer-reviewed.
NORA Subject Terms: Earth Sciences
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Date made live: 22 Mar 2019 14:33 +0 (UTC)

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