Pressure gradient structures in the tail neutral sheet as “roots of the arcs” with some effects of stochasticity

Galperin, Yu. I.; Volosevich, A. V.; Zelenyǐ, L. M.

doi:10.1029/92gl02178

Cited by 25 publications

(35 citation statements)

References 15 publications

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“…A comparison between the wave phase and the derivative of DC B Y component is consistent with the field variations produced by a DC current modulation. A second increase of the wave power started around 18:01:05 UT (when EQUB was (Lu et al, 1991;Galperin et al, 1992); d resulting Pedersen conductivity identified) with the maximum of power density registered at the higher frequency. For this band the wave phase-DC B Y correlation is not so good as for the POLB.…”

Section: Multiple Current Sheets On Pass 1563 Of the Magion-2mentioning

confidence: 99%

“…4. a Magnetic field components in the EQUB's principal axis reference system; b field aligned current density (positive for downward current); c resulting field aligned potential drop (Lu et al 1991;Galperin et al, 1992); d resulting Pedersen conductivity 6 Inferred and observable auroral and precipitation effects…”

Section: Multiple Current Sheets On Pass 2057 Of the Magion-3mentioning

confidence: 99%

“…A steady elongated generator of a double current sheet (downward and upward) in the plasma sheet, where the EQUB is mapped along geomagnetic field lines, was considered in a model of double field-aligned (FA) current sheet by Galperin, (1992) and Galperin et al, (1992). It was based on a phenomenological inclusion of non-adiabatic ion motion effects (deterministic chaos) in the neutral sheet accompanied by an enhanced narrow cross-tail westward ''line current''.…”

Section: Sheet Current Stratification In the Plasma Sheet Current Sourcementioning

confidence: 99%

“…For calculations of the effects of the auroral FA currents we modified the program developed by one of the authors (Galperin 1992;Galperin et al, 1992) using as inputs the current density deduced for POLB and EQUB (Figs. 2c-e 3c-e).…”

Section: Multiple Current Sheets On Pass 2057 Of the Magion-3mentioning

confidence: 99%

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Multiple current sheets in a double auroral oval observed from the MAGION-2 and MAGION-3 satellites

et al. 1997

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Abstract. A case is described of multiple current sheets crossed by the MAGION-2 satellite in the near-midnight quieting auroral oval. The data were obtained by the magnetometer experiment onboard. Results show during a quieting period after a preceding substorm, or during an early growth phase of the next substorm, two double-sheet current bands, POLB and EQUB, located at respectively the polar and equatorial borders of the auroral oval separated by about 500 km in latitude. This is consistent with the double-oval structure during recovery introduced by Elphinstone et al. (1995). Within the POLB, the magnetic field data show simultaneous existence of several narrow parallel bipolar current sheets within the upward current branch (at 69.5-70.3°i nvariant latitude) with an adjacent downward current branch at its polar side at (70.5-71.3°). The EQUB was similarly stratified and located at 61.2-63.5°invariant latitude. The narrow current sheets were separated on average by about 35 km and 15 km, respectively, within the POLB and EQUB. A similar case of double-oval current bands with small-scale structuring of their upward current branches during a quieting period is found in the data from the MAGION-3 satellite. These observations contribute to the double-oval structure of the late recovery phase, and add a small-scale structuring of the upward currents producing the auroral arcs in the double-oval pattern, at least for the cases presented here. Other observations of multiple auroral current sheets and theories of auroral arc multiplicity are briefly discussed. It is suggested that multiple X-lines in the distant tail, and/or leakage of energetic particles and FA currents from a series of plasmoids formed during preceding magnetic activity, could be one cause of highly stratified upward FA currents at the polar edge of the quieting double auroral oval.

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Section: Multiple Current Sheets On Pass 1563 Of the Magion-2mentioning

confidence: 99%

Section: Multiple Current Sheets On Pass 2057 Of the Magion-3mentioning

confidence: 99%

Section: Sheet Current Stratification In the Plasma Sheet Current Sourcementioning

confidence: 99%

Section: Multiple Current Sheets On Pass 2057 Of the Magion-3mentioning

confidence: 99%

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Multiple current sheets in a double auroral oval observed from the MAGION-2 and MAGION-3 satellites

et al. 1997

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“…Pressure gradients have been discussed in connection to auroral arc formation, e.g. by Galperin et al (1992).…”

Section: Recent Observations Confirm Earlier Studiesmentioning

confidence: 99%

On the profile of intense high-altitude auroral electric fields at magnetospheric boundaries

et al. 2006

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Abstract. The profile of intense high-altitude electric fields on auroral field lines has been studied using Cluster data. A total of 41 events with mapped electric field magnitudes in the range between 0.5-1 V/m were examined, 27 of which were co-located with a plasma boundary, defined by gradients in particle flux, plasma density and plasma temperature. Monopolar electric field profiles were observed in 11 and bipolar electric field profiles in 16 of these boundaryassociated electric field events. Of the monopolar fields, all but one occurred at the polar cap boundary in the late evening and midnight sectors, and the electric fields were typically directed equatorward, whereas the bipolar fields all occurred at plasma boundaries clearly within the plasma sheet. These results support the prediction by Marklund et al. (2004), that the electric field profile depends on whether plasma populations, able to support intense field-aligned currents and closure by Pedersen currents, exist on both sides, or one side only, of the boundary.

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RCM‐E simulation of substorm growth phase arc associated with large‐scale adiabatic convection

Yang

Wolf

Toffoletto

et al. 2013

Geophysical Research Letters

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[1] Substorm auroral breakup often occurs on a longitudinally elongated arc at the end of a growth phase. We present an idealized high-resolution simulation with the Rice Convection Model-Equilibrium (RCM-E) to investigate how large-scale adiabatic convection under equilibrium conditions can give rise to an auroral arc. We find that a thin arc that maps to the magnetic transition region at r~8 R E emerges in the late growth phase. The simulation implies that the arc in the premidnight sector is associated with a sheet of additional region 1 sense field-aligned current (FAC) just poleward of the main region 2 FAC, while the arc in the postmidnight sector is associated with the poleward portion of the main upward region 2 FAC. Explanations for the location and the thickness of the arc are proposed, based on the simulation.Citation: Yang, J., R. A. Wolf, F. R. Toffoletto, and S. Sazykin (2013), RCM-E simulation of substorm growth phase arc associated with large-scale adiabatic convection, Geophys. Res. Lett., 40,[6017][6018][6019][6020][6021][6022]

show abstract

Pressure gradient structures in the tail neutral sheet as “roots of the arcs” with some effects of stochasticity

Cited by 25 publications

References 15 publications

Multiple current sheets in a double auroral oval observed from the MAGION-2 and MAGION-3 satellites

Multiple current sheets in a double auroral oval observed from the MAGION-2 and MAGION-3 satellites

On the profile of intense high-altitude auroral electric fields at magnetospheric boundaries

RCM‐E simulation of substorm growth phase arc associated with large‐scale adiabatic convection

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