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Quantitative performance assessment of recent empirical geomagnetic field models in outer radiation belt zone
Alternative Title20204609497339
Wang, Li1,2,3; Yang, Xiaochao1,3; Zhang, Shenyi1,2,3
Source PublicationActa Geophysica Sinica
2020
Volume63Issue:11Pages:3944-3951
DOI10.6038/cjg2020O0030
ISSN00015733
Language中文
KeywordMagnetic fields - Radiation belts External magnetic field - Geomagnetic conditions - Geomagnetic field model - Geosynchronous orbits - Magnetic field models - Magnetic field vectors - Outer radiation belt - Performance assessment
AbstractAccuracy of geomagnetic field model has key importance for the theoretical and operational studies about radiation belt. Using magnetic field data measured by Van Allen Probes (VAP) from 2012 to 2018 and GOES15 from 2011 to 2017, this paper quantitatively evaluates performances of three newer empirical external magnetic field models (TS05, TA15, and TA16) in the outer radiation belt (3~6.6RE). The prediction efficiency (PE) is chosen as a measure to quantitatively assess models' performance in various spatial ranges (Lm), under different geomagnetic conditions (Kp), and along with magnetic local time (MLT). Also, θ (the angle between the observed and estimated magnetic field vector) is calculated to evaluate the model's ability to predict the direction of the magnetic field. The results show that with increasing Lm and disturbed level of geomagnetic field, the PE decreases and the θ increases. The PE at MLT=12-21 is smaller than MLT=0-9 in the range of Lm=5~6.5RE, showing a dawn-dusk asymmetry and indicating that the three magnetic field models can describe the strength of the magnetic field in the dawn sector better than in the sector from afternoon to dusk; at the geosynchronous orbit (Lm~6.6RE), PE at MLT=9-15 is greater than at other local times, the day-night asymmetry indicates that the three magnetic field models can well estimate the magnitude of the magnetic field in the dayside, but they may have noticeable errors on the nightside. The θ at MLT=6-12 is smaller than at other local times, showing a day-night asymmetry and indicating that the three magnetic field models can better describe the geomagnetic field configuration in the dayside, but they may have noticeable errors in the nightside. Within the range of Lm~3~6.5RE, the estimations of TA16 are the closest to the observations from VAP, with PE>0.7 and θE), the estimation of TS05 model is the closest to the observations from GOES15 with PE of about 0.75 and θ of about 7 °. The relevant research results can provide references for the selection of geomagnetic field models for the on-orbit cross calibration of energetic particles for Chinese spaceborne energetic particle detectors, the study of the dynamic model of energetic particles in the radiation belt, and related theory/application research of the magnetospheric environment. © 2020, Science Press. All right reserved.
Indexed ByEI
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Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/7483
Collection中国科学院国家空间科学中心
Affiliation1.National Space Science Center, Chinese Academy of Science, Beijing; 100190, China;
2.University of Chinese Academy of Sciences, Beijing; 100149, China;
3.Beijing Key Laboratory of Space Environment Exploration, Beijing; 100190, China
Recommended Citation
GB/T 7714
Wang, Li,Yang, Xiaochao,Zhang, Shenyi. Quantitative performance assessment of recent empirical geomagnetic field models in outer radiation belt zone[J]. Acta Geophysica Sinica,2020,63(11):3944-3951.
APA Wang, Li,Yang, Xiaochao,&Zhang, Shenyi.(2020).Quantitative performance assessment of recent empirical geomagnetic field models in outer radiation belt zone.Acta Geophysica Sinica,63(11),3944-3951.
MLA Wang, Li,et al."Quantitative performance assessment of recent empirical geomagnetic field models in outer radiation belt zone".Acta Geophysica Sinica 63.11(2020):3944-3951.
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