RCM‐E and AMIE studies of the Harang reversal formation during a steady magnetospheric convection event

Yang, Jian; Toffoletto, F.; Lu, G.; Wiltberger, M. J.

doi:10.1002/2014ja020207

Cited by 12 publications

(16 citation statements)

References 39 publications

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“…The associations we found among FACs, convection, and pV γ are consistent with the requirements for the interchange stability of the plasma sheet in the presence of the R1 and R2 currents (section 4). A similar simulation but with the Rice Convection Model-Equilibrium (RCM-E) for a steady magnetospheric convection event was reported by Yang et al [2014]. Their simulated convection pattern also reveals the Harang reversal, and its location relative to the FAC distribution is consistent with our expectation (see Figure 5 of their paper).…”

Section: Comparision With a Modeled Plasma Sheetsupporting

confidence: 86%

“…A similar simulation but with the Rice Convection Model-Equilibrium (RCM-E) for a steady magnetospheric convection event was reported by Yang et al [2014]. A similar simulation but with the Rice Convection Model-Equilibrium (RCM-E) for a steady magnetospheric convection event was reported by Yang et al [2014].…”

Section: Comparision With a Modeled Plasma Sheetsupporting

confidence: 66%

“…A convection structure of our particular interest is the Harang reversal [Harang, 1946], which in the ionosphere is characterized as the interface between the eastward and westward convection flows on its poleward and equatorward sides, respectively [Heppner, 1972;Maynard, 1974]. Modeling studies also suggest that ion thermal kinetics play an essential role in the formation of the Harang reversal in the magnetosphere [Erickson et al, 1991;Gkioulidou et al, 2009;Yang et al, 2014]. The associated latitudinal electric field converges at the reversal, suggesting that the reversal is collocated with an upward FAC; the distributions of convection and FACs are actually more complex because of the spatial gradient of ionospheric conductance (see section 4).…”

Section: Introductionmentioning

confidence: 99%

“…We refer to this upward FAC as R1 current in this study following the convention although it is probably driven by the pressure gradient in the plasma sheet in the same way as the R2 current is driven (see section 3). Modeling studies also suggest that ion thermal kinetics play an essential role in the formation of the Harang reversal in the magnetosphere [Erickson et al, 1991;Gkioulidou et al, 2009;Yang et al, 2014]. The Harang reversal is often collocated with discrete auroral arcs, and substorm onsets very often take place in the vicinity of this reversal [e.g., Bristow and Jensen, 2007;Weygand et al, 2008;Zou et al, 2009aZou et al, , 2009b.…”

Section: Introductionmentioning

confidence: 99%

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The Harang reversal and the interchange stability of the magnetotail

et al. 2016

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The present study addresses steady convection in the plasma sheet in terms of the interchange stability with special attention to the Harang reversal. The closure of the tail current with a field‐aligned current (FAC) results from the divergence/convergence of the pressure gradient current. If the magnetotail is in a steady state, the associated change of local plasma pressure p has to balance with its advective change. Accordingly, for adiabatic transport, the flux tube entropy parameter pVγ increases and decreases along the convection path in regions corresponding to downward and upward FACs, respectively. This requirement, along with the condition for the interchange stability imposes an important constraint on the direction of convection especially in the regions of downward FACs. It is deduced that for the dusk cell, the convection in the downward R2 current has to be directed azimuthally duskward, which follows the sunward, possibly dawnward deflected, convection in the region of the premidnight upward R1 current. This duskward turn of convection takes place in the vicinity of the R1‐R2 demarcation, and it presumably corresponds to the Harang reversal. For the dawn cell the convection in the postmidnight downward R1 current has to deflect dawnward, and then it proceeds sunward in the upward R2 current. The continuity of the associated ionospheric currents consistently reproduces the assumed FAC distribution. The proposed interrelationships between the convection and FACs are also verified with a quasi‐steady plasma sheet configuration and convection reproduced by a modified Rice Convection Model with force balance.

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Section: Comparision With a Modeled Plasma Sheetsupporting

confidence: 86%

Section: Comparision With a Modeled Plasma Sheetsupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Harang reversal and the interchange stability of the magnetotail

et al. 2016

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“…Changes to the hot electron drift paths will alter the trapped electron fluxes, while changes in the cold plasma evolution will alter the rate at which the trapped electron fluxes are converted into precipitating fluxes via pitch angle scattering by chorus and hiss waves. The version used at The Aerospace Corporation (Chen et al, 2012, Chen, Lemon, Orlova, et al, 2015, Chen, Lemon, Guild, et al, 2015, Chen et al, 2019 is different than the version used at Rice University (Yang et al, 2014, but the fundamental physics and much of the central code is the same. The RCM-E is a model of magnetospheric plasma drift, electrodynamic coupling with the ionosphere (Harel, 1981;Sazykin et al, 2002Sazykin et al, , 2005, and coupling between the plasma and magnetic field (Lemon, 2003, Lemon et al, 2004.…”

Section: Rcm-e Descriptionmentioning

confidence: 99%

The Magnetosphere‐Ionosphere Electron Precipitation Dynamics and Their Geospace Consequences During the 17 March 2013 Storm

et al. 2019

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During geomagnetic storms and substorms, the magnetosphere and ionosphere are strongly coupled by precipitating magnetospheric electrons from the Earth's plasma sheet and driven by both magnetospheric and ionospheric processes. Magnetospheric wave activity initiates electron precipitation, and the ionosphere and upper atmosphere further facilitate this process by enhancing the value of precipitated energy fluxes via connection of two magnetically conjugate regions and multiple atmospheric reflections. This paper focuses on the resulting electron energy fluxes and affiliated height‐integrated Pedersen and Hall conductances in the auroral regions produced by multiple atmospheric reflections during the 17 March 2013 geomagnetic storm and their effects on the inner magnetospheric electric field and ring current. Our study is based on the magnetically and electrically self‐consistent Rice Convection Model‐Equilibrium of the inner magnetosphere with SuperThermal Electron Transport modified electron energy fluxes that take into account the electron energy interplay between the two magnetically conjugate ionospheres. SuperThermal Electron Transport‐modified energy flux in the Rice Convection Model‐Equilibrium leads to a significant difference in the global conductance pattern, ionospheric electric field formation, Birkeland current structure, ring current energization and its energy content, subauroral polarization drifts intensifications and their spatial locations, interchange instability redistribution, and overall energy interplay on the global scale.

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