Initial results from a dynamic coupled magnetosphere‐ionosphere‐ring current model

Pembroke, A. D.; Toffoletto, F.; Sazykin, S.; Wiltberger, M. J.; Lyon, J. G.; Merkin, V. G.; Schmitt, P.

doi:10.1029/2011ja016979

Cited by 117 publications

(145 citation statements)

References 59 publications

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“…The focus of this paper has been the evolution of fields calculated from the simulation model using measured solar wind input from ACE, Wind and ARTEMIS spacecraft. The LFM-RCM model couples the Lyon-Fedder-Mobarry (LFM) global MHD code with the Rice Convection Model (RCM) of the ring current and includes dipole tilt and a Kp = 5 non-evolving embedded plasmasphere for storm time simulations (see Pembroke et al, 2012;Hudson et al, 2014a).…”

Section: Discussion and Summarymentioning

confidence: 99%

“…RCM has an option of incorporating dipole tilt which is enabled for all runs presented in this paper. Twoway coupling between LFM and RCM is discussed in Pembroke et al (2012).…”

Section: Mhd Modelmentioning

confidence: 99%

“…LFM is coupled with two other models which improve description of physical processes in the inner magnetosphere. The Rice Convection Model (RCM) provides a representation of ring current particle populations including drift physics (Toffoletto et al, 2003;Pembroke et al, 2012) and the Magnetosphere-Ionosphere Coupler/Solver (MIX) model provides an inner boundary at 2 R E (Merkin and Lyon, 2010).…”

Section: Mhd Modelmentioning

confidence: 99%

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Magnetohydrodynamic modeling of three Van Allen Probes storms in 2012 and 2013

et al. 2015

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Abstract. Coronal mass ejection (CME)-shock compression of the dayside magnetopause has been observed to cause both prompt enhancement of radiation belt electron flux due to inward radial transport of electrons conserving their first adiabatic invariant and prompt losses which at times entirely eliminate the outer zone. Recent numerical studies suggest that enhanced ultra-low frequency (ULF) wave activity is necessary to explain electron losses deeper inside the magnetosphere than magnetopause incursion following CME-shock arrival. A combination of radial transport and magnetopause shadowing can account for losses observed at radial distances into L = 4.5, well within the computed magnetopause location. We compare ULF wave power from the Electric Field and Waves (EFW) electric field instrument on the Van Allen Probes for the 8 October 2013 storm with ULF wave power simulated using the Lyon-FedderMobarry (LFM) global magnetohydrodynamic (MHD) magnetospheric simulation code coupled to the Rice Convection Model (RCM). Two other storms with strong magnetopause compression, 8-9 October 2012 and 17-18 March 2013, are also examined. We show that the global MHD model captures the azimuthal magnetosonic impulse propagation speed and amplitude observed by the Van Allen Probes which is responsible for prompt acceleration at MeV energies reported for the 8 October 2013 storm. The simulation also captures the ULF wave power in the azimuthal component of the electric field, responsible for acceleration and radial transport of electrons, at frequencies comparable to the electron drift period. This electric field impulse has been shown to explain observations in related studies (Foster et al., 2015) of electron acceleration and drift phase bunching by the Energetic Particle, Composition, and Thermal Plasma Suite (ECT) instrument on the Van Allen Probes.

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Section: Discussion and Summarymentioning

confidence: 99%

“…RCM has an option of incorporating dipole tilt which is enabled for all runs presented in this paper. Twoway coupling between LFM and RCM is discussed in Pembroke et al (2012).…”

Section: Mhd Modelmentioning

confidence: 99%

Section: Mhd Modelmentioning

confidence: 99%

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Magnetohydrodynamic modeling of three Van Allen Probes storms in 2012 and 2013

et al. 2015

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“…Third, we include new simulation results using the BATS-R-US-CRCM model Glocer et al, 2013) to physically interpret the local and global observations. Recently, significant progress has been made in ring current and global magnetosphere modeling with the development of so-called "twoway coupled models" Pembroke et al, 2012;Glocer et al, 2013;Meng et al, 2013). We demonstrate how this modeling approach helps to infer systemlevel dynamics, connect multipoint observations in different domains, and analyze global magnetosphere dynamics and coupling with the ionosphere.…”

Section: Introductionmentioning

confidence: 99%

Magnetosphere dynamics during the 14 November 2012 storm inferred from TWINS, AMPERE, Van Allen Probes, and BATS-R-US–CRCM

et al. 2018

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Abstract. During the 14 November 2012 geomagnetic storm, the Van Allen Probes spacecraft observed a number of sharp decreases ("dropouts") in particle fluxes for ions and electrons of different energies. In this paper, we investigate the global magnetosphere dynamics and magnetosphereionosphere (M-I) coupling during the dropout events using multipoint measurements by Van Allen Probes, TWINS, and AMPERE together with the output of the two-way coupled global BATS-R-US-CRCM model. We find different behavior for two pairs of dropouts. For one pair, the same pattern was repeated: (1) weak nightside Region 1 and 2 Birkeland currents before and during the dropout; (2) intensification of Region 2 currents after the dropout; and (3) a particle injection detected by TWINS after the dropout. The model predicted similar behavior of Birkeland currents. TWINS low-altitude emissions demonstrated high variability during these intervals, indicating high geomagnetic activity in the near-Earth tail region. For the second pair of dropouts, the structure of both Birkeland currents and ENA emissions was relatively stable. The model also showed quasi-stationary behavior of Birkeland currents and simulated ENA emissions with gradual ring current buildup. We confirm that the first pair of dropouts was caused by large-scale motions of the OCB (open-closed boundary) during substorm activity. We show the new result that this OCB motion was associated with global changes in Birkeland (M-I coupling) currents and strong modulation of low-altitude ion precipitation. The second pair of dropouts is the result of smaller OCB disturbances not related to magnetospheric substorms. The local observations of the first pair of dropouts result from a global magnetospheric reconfiguration, which is manifested by ion injections and enhanced ion precipitation detected by TWINS and changes in the structure of Birkeland currents detected by AMPERE. This study demonstrates that multipoint measurements along with the global model results enable the reconstruction of a more complete system-level picture of the dropout events and provides insight into M-I coupling aspects that have not previously been investigated.

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“…The details of this coupling, such as partially reflecting ionosphere or the coupling of Alfvén and compressional waves in a curved geometry, are tempting for future work, where advanced coupled modeling [e.g., de Zeeuw et al, 2004;Pembroke et al, 2012] may be useful.…”

Section: Panov Et Almentioning

confidence: 99%

Period and damping factor of Pi2 pulsations during oscillatory flow braking in the magnetotail

et al. 2014

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, we compare the oscillation period and the damping factor of the plasma sheet flows with those of the Pi2 magnetic pulsations on the ground at auroral and midlatitudes near the local time of the conjugate ionospheric THEMIS footprints. Whereas the damping of the plasma sheet flows and of the pulsations on the ground occurs on the same time scales, the frequency of the pulsations is on average twice the frequency of the plasma sheet flows. We conclude that larger-amplitude ground pulsations at auroral latitudes were caused by the oscillatory flow braking in the plasma sheet, presumably through alternating field-aligned currents as suggested by Panov et al. (2013c).

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Initial results from a dynamic coupled magnetosphere‐ionosphere‐ring current model

Cited by 117 publications

References 59 publications

Magnetohydrodynamic modeling of three Van Allen Probes storms in 2012 and 2013

Magnetohydrodynamic modeling of three Van Allen Probes storms in 2012 and 2013

Magnetosphere dynamics during the 14 November 2012 storm inferred from TWINS, AMPERE, Van Allen Probes, and BATS-R-US–CRCM

Period and damping factor of Pi2 pulsations during oscillatory flow braking in the magnetotail

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