Pressure balance inconsistency exhibited in a statistical model of magnetospheric plasma

Garner, T. W.

doi:10.1029/2003ja009877

Cited by 34 publications

(54 citation statements)

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“…d/dr(pV γ )>0 ). Validity of this condition for the Earth's magnetotail was verified by computations based on empirical magnetospheric models (Garner et al, 2003). However, this also implies that 2-D Earthward convection is prohibited (suppressed), providing a so-called convection crisis (Erickson and Wolf, 1980): The magnetic configuration becomes progressively more stretched, providing the magnetic energy storage in the tail.…”

Section: Bubblementioning

confidence: 99%

“…The ballooning-like mode in the high-β plasma sheet with a large normal component of magnetic field was claimed to be able to propagate azimuthally in the flankward directions (Golovchanskaya and Maltsev, 2004). This model currently looks most suitable for explaining quasi-periodic, slip-type flapping observed in a quiet, thick plasma sheet.…”

Section: Current Sheet Flapping Modelsmentioning

confidence: 99%

“…Although the above scenario includes interchange dynamics as a secondary process (in the sense of time sequence, but not of its importance), one should not exclude the possibility that interchange instability can sometimes form the bubbles. For example, in the plasma sheet regions with azimuthal pressure gradients which are required to support the large-scale fieldaligned currents (Golovchanskaya and Maltsev, 2003), the instability growth, direction of flow and propagation can all be changed as compared to the general case described above, making the interchange process easier to grow.…”

Section: Bubblementioning

confidence: 99%

“…The global MHD simulations (Lyon, 2000;Gombosi et al, 2003;Raeder, 2003) have provided a general framework for the understanding of the solar wind-magnetosphere coupling, in particular the connectivity among the differenet regions. In general such models have limitations in describing most of the localized and transient structures discussed in this review.…”

Section: Theory and Modelsmentioning

confidence: 99%

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Transient and localized processes in the magnetotail: a review

et al. 2008

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Abstract. Many phenomena in the Earth's magnetotail have characteristic temporal scales of several minutes and spatial scales of a few Earth radii (R E ). Examples of such transient and localized mesoscale phenomena are bursty bulk flows, beamlets, energy dispersed ion beams, flux ropes, traveling compression regions, night-side flux transfer events, and rapid flappings of the current sheet. Although most of these observations are linked to specific interpretations or theoretical models they are inter-related and can be the different aspects of a physical process or origin. Recognizing the inter-connected nature of the different transient and localized phenomena in the magnetotail, this paper reviews their observations by highlighting their important characteristics, with emphasis on the new results from Cluster multipoint observations. The multi-point Cluster measurements have provided, for the first time, the ability to distinguish between temporal and spatial variations, and to resolve spatial structures. Some examples of the new results are: flux ropes with widths of 0.3 R E , transient field aligned currents associated with bursty bulk flows and connected to the Hall current at the magnetic reconnection, flappings of the magnetotail current sheet with time scales of 100 s-10 min and thickness of few thousand km, and particle energization including velocity and time dispersed ion structures with the Correspondence to: A. S. Sharma (ssh@astro.umd.edu) latter having durations of 1-3 min. The current theories of these transient and localized processes are based largely on magnetic reconnection, although the important role of the interchange and other plasma modes are now well recognized. On the kinetic scale, the energization of particles takes place near the magnetic X-point by non-adiabatic processes and wave-particle interactions. The theory, modeling and simulations of the plasma and field signatures are reviewed and the links among the different observational concepts and the theoretical frameworks are discussed. The mesoscale processes in the magnetotail and the strong coupling among them are crucial in developing a comprehensive understanding of the multiscale phenomena of the magnetosphere.

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Section: Bubblementioning

confidence: 99%

Section: Current Sheet Flapping Modelsmentioning

confidence: 99%

Section: Bubblementioning

confidence: 99%

Section: Theory and Modelsmentioning

confidence: 99%

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Transient and localized processes in the magnetotail: a review

et al. 2008

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“…[40] The average ion density n i and temperature T i showed the well-known tendency for the plasma sheet to be cold and dense when the IMF was northward [Terasawa et al, 1997;Fujimoto et al, 1998;Garner et al, 2003;Wang et al, 2006]. Figure 8 shows n i for the four models.…”

Section: Sorting By Imf Directionmentioning

confidence: 99%

Ion heat flux and energy transport near the magnetotail neutral sheet

Kaufmann

Paterson

2008

J. Geophys. Res.

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[1] Ten-year averages of energy transport rates near the neutral sheet showed that the enthalpy flux density or thermal energy term Q T = (5/2)PV was the largest, where P is the isotropic pressure and V is the bulk flow velocity. The ion heat flux, q i , was the next largest term. Sorting data using a magnetic flux transport parameter showed that q i could become dominant during periods of slow flow. Both q i and the ion bulk velocity V i were duskward on the dusk side of the neutral sheet. This relationship is characteristic of crosstail drift and a heat flux that can be attributed to the energy dependent gradient and curvature drifts. The q i and V i vectors often pointed in different directions on the dawn side. The x component of q i on the dawn side pointed tailward, suggesting entry through the magnetopause of a suprathermal ion component. On the dusk side the q ix plots that were sorted using a magnetic flux transport parameter showed evidence of plasma sheet reconnection. The long-term averaged x component of Q T pointed earthward almost everywhere in the neutral sheet, and was attributed to periods of very fast plasma flow. The cross-tail component of Q T was separated into two contributions. One part of Q Ty involved a common drift away from midnight during both earthward and tailward fast flows. This feature suggests that thermal energy and plasma flow from the outer plasma sheet toward the neutral sheet near midnight, and then toward the flanks. The other part of Q Ty involved a differential duskward drift during fast earthward flows and a dawnward drift during fast tailward flows. The incremental E fields that would produce such convection point tailward during the fastest earthward flows and earthward during the fastest tailward flows. The dependencies of V i , q i and Q T on the interplanetary magnetic field (IMF) clock angle also were studied. Both V i and Q T were reduced when the IMF was northward and the neutral sheet plasma became cold and dense. However, no dependence of q i on the IMF direction was seen. This shows that the generation of a cold dense plasma sheet does not substantially change the distribution of the suprathermal ions that are most important in the production of q i .Citation: Kaufmann, R. L., and W. R. Paterson (2008), Ion heat flux and energy transport near the magnetotail neutral sheet,

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Solar Wind Entry Into and Transport Within Planetary Magnetotails

Wing

2015

Magnetotails in the Solar System

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Pressure balance inconsistency exhibited in a statistical model of magnetospheric plasma

Cited by 34 publications

References 50 publications

Transient and localized processes in the magnetotail: a review

Transient and localized processes in the magnetotail: a review

Ion heat flux and energy transport near the magnetotail neutral sheet

Solar Wind Entry Into and Transport Within Planetary Magnetotails

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