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Article

Evaluating the Accuracy of Magnetospheric Magnetic Field Models Using Cluster Spacecraft Magnetic Field Measurements

Faculty of Mathematics and Physics, Charles University, 18000 Prague, Czech Republic
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Author to whom correspondence should be addressed.
Academic Editor: Vladimir Semenov
Universe 2021, 7(8), 282; https://doi.org/10.3390/universe7080282
Received: 23 June 2021 / Revised: 27 July 2021 / Accepted: 1 August 2021 / Published: 3 August 2021
(This article belongs to the Special Issue Planetary Plasma Environment)
Magnetic fields in the inner magnetosphere can be obtained as vector sums of the Earth’s own internal magnetic field and magnetic fields stemming from currents flowing in the space plasma. While the Earth’s internal magnetic field is accurately described by the International Geomagnetic Reference Field (IGRF) model, the characterization of the external magnetic fields is significantly more complicated, as they are highly variable and dependent on the actual level of the geomagnetic activity. Tsyganenko family magnetic field models (T89, T96, T01, TA15B, TA15N), parameterized by the geomagnetic activity level and solar wind parameters, are often used by the involved community to describe these fields. In the present paper, we use a large dataset (2001–2018) of magnetospheric magnetic field measurements obtained by the four Cluster spacecraft to assess the accuracy of these models. We show that, while the newer models (T01, TA15B, TA15N) perform significantly better than the old ones (T89, T96), there remain some systematic deviations, in particular at larger latitudes. Moreover, we compare the locations of the min-B equator determined using the four-point Cluster spacecraft measurements with the locations determined using the magnetic field models. We demonstrate that, despite the newer models being comparatively slightly more accurate, an uncertainty of about one degree in the latitude of the min-B equator remains. View Full-Text
Keywords: magnetosphere; magnetic field models; Cluster spacecraft magnetosphere; magnetic field models; Cluster spacecraft
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MDPI and ACS Style

Němec, F.; Kotková, M. Evaluating the Accuracy of Magnetospheric Magnetic Field Models Using Cluster Spacecraft Magnetic Field Measurements. Universe 2021, 7, 282. https://doi.org/10.3390/universe7080282

AMA Style

Němec F, Kotková M. Evaluating the Accuracy of Magnetospheric Magnetic Field Models Using Cluster Spacecraft Magnetic Field Measurements. Universe. 2021; 7(8):282. https://doi.org/10.3390/universe7080282

Chicago/Turabian Style

Němec, František, and Marie Kotková. 2021. "Evaluating the Accuracy of Magnetospheric Magnetic Field Models Using Cluster Spacecraft Magnetic Field Measurements" Universe 7, no. 8: 282. https://doi.org/10.3390/universe7080282

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