Simulations of inner magnetosphere dynamics with an expanded RAM‐SCB model and comparisons with Van Allen Probes observations

V. K Jordanova; C. A Kletzing; Y Yu; J. T Niehof; R. M Skoug; G. D Reeves; J. F Fennell; H. E Spence

doi:10.1002/2014GL059533

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Simulations of inner magnetosphere dynamics with an expanded RAM‐SCB model and comparisons with Van Allen Probes observations

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Simulations of inner magnetosphere dynamics with an expanded RAM‐SCB model and comparisons with Van Allen Probes observations

V. K Jordanova, C. A Kletzing, Y Yu, J. T Niehof, R. M Skoug, G. D Reeves, J. F Fennell and H. E Spence

Geophysical research letters, Vol.41(8), pp.2687-2694

04/28/2014

DOI: 10.1002/2014GL059533

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Abstract

Simulations from our newly expanded ring current‐atmosphere interactions model with self‐consistent magnetic field (RAM‐SCB), now valid out to 9 RE, are compared for the first time with Van Allen Probes observations. The expanded model reproduces the storm time ring current buildup due to the increased convection and inflow of plasma from the magnetotail. It matches Magnetic Electron Ion Spectrometer (MagEIS) observations of the trapped high‐energy (>50 keV) ion flux; however, it underestimates the low‐energy (<10 keV) Helium, Oxygen, Proton, and Electron (HOPE) observations. The dispersed injections of ring current ions observed with the Energetic particle, Composition, and Thermal plasma (ECT) suite at high (>20 keV) energy are better reproduced using a high‐resolution convection model. In agreement with Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) observations, RAM‐SCB indicates that the large‐scale magnetic field is depressed as close as ∼4.5 RE during even a moderate storm. Regions of electromagnetic ion cyclotron instability are predicted on the duskside from ∼6 to ∼9 RE, indicating that previous studies confined to geosynchronous orbit may have underestimated their scattering effect on the energetic particles. Key PointsExpanded RAM‐SCB model reproduces well high‐energy (>50 keV) MagEIS observationsThe magnetic field is depressed as close as ∼4.5 RE during even a moderate stormEMIC wave growth extends on duskside from ∼6 to ∼9 RE during storm main phase

inner magnetosphere

radiation belts

ring current

Details

Title: Subtitle: Simulations of inner magnetosphere dynamics with an expanded RAM‐SCB model and comparisons with Van Allen Probes observations
Creators: V. K Jordanova - Los Alamos National Laboratory
C. A Kletzing - University of Iowa
Y Yu - Los Alamos National Laboratory
J. T Niehof - Los Alamos National Laboratory
R. M Skoug - Los Alamos National Laboratory
G. D Reeves - Los Alamos National Laboratory
J. F Fennell - The Aerospace Corporation
H. E Spence - University of New Hampshire
Resource Type: Journal article
Publication Details: Geophysical research letters, Vol.41(8), pp.2687-2694
DOI: 10.1002/2014GL059533
ISSN: 0094-8276
eISSN: 1944-8007
Number of pages: 8
Language: English
Date published: 04/28/2014
Academic Unit: Physics and Astronomy
Record Identifier: 9984199697702771

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