Role of collisionless heat flux in magnetospheric convection

Heinemann, Michael

doi:10.1029/1999ja900401

Cited by 29 publications

(59 citation statements)

References 12 publications

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“…A thermodynamic interpretation of the heat flux is that, if two adjacent microensembles (two flux tubes of equal volume) are not in thermodynamic equilibrium (p and/or T different), a heat flux will arise. In contrast to the theory of Heinemann [1999], the heat flux was calculated self-consistently, and does not presume a Maxwellian distribution.…”

Section: Summary and Discussionmentioning

confidence: 99%

“…Although (21) has the same dimensional and qualitative behavior as the fluid-mechanical heat flux given by Heinemann [1999], its basis is the actual behavior of adiabatic drift in the inner magnetosphere and does not presume a Maxwellian distribution, as S is well-defined for any type of distribution functions. For a k distribution, for example,…”

Section: Liu: Heat Flux In Magnetospheric Convection L19104mentioning

confidence: 99%

“…[2] Heinemann [1999] proposed that a heat flux should be present in the energy equation governing inner magnetospheric processes and gave a specific form based on the classical plasma transport theory [Braginskii, 1965]. In order to use the classical transport coefficient derived for an equilibrium plasma, one makes the assumption that the underlying plasma distribution is constantly Maxwellian.…”

Section: Introductionmentioning

confidence: 99%

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Heat flux in magnetospheric convection: A calculation based on adiabatic drift theory

Liu

2006

Geophysical Research Letters

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[1] Empiric evidence and theoretical argument indicate that magnetospheric convection is globally sub-adiabatic. Reconciliation of the sub-adiabaticity with the underlying adiabatic particle drifts is a problem that has not been conclusively demonstrated. In this paper, through an ensemble average, we show that the Rice Convection Model contains a heat flux due to thermal inequilibrium between two adjacent flux tubes of equal volume. The averaged theory is based on field variables obeying a set of partial differential equations (Eulerian formulation), instead of conservative variables advecting with fluid elements (Langrangian formulation). We apply the theory to investigate a one-dimensional case of subadiabatic variation of thermodynamic properties in the plasma sheet.

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Section: Summary and Discussionmentioning

confidence: 99%

Section: Liu: Heat Flux In Magnetospheric Convection L19104mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heat flux in magnetospheric convection: A calculation based on adiabatic drift theory

Liu

2006

Geophysical Research Letters

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“…The approach taken by Heinemann [1999] to obtaining a fluid theory of magnetospheric convection in the form of an RCM-type of drift model was to integrate the equations of mass and energy conservation over magnetic flux tubes, resulting in equations of motion for the number per unit flux and the entropy along the fluid drift path in the equatorial plane. The physical assumptions made were that the flow speed of each species is much less than the thermal speed, the pressure is isotropic, the number density is constant along the magnetic field, there are no parallel electric fields, and time variations are slow compared to MHD wave travel times.…”

Section: Fcm2mentioning

confidence: 99%

Relationships of models of the inner magnetosphere to the Rice Convection Model

Heinemann¹,

Wolf²

2001

J. Geophys. Res.

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“…However, observations of unidirectional particle beams, plateaus, and other highly asymmetric features in velocity distribution functions f (v) imply that q is nonzero. Heinemann [1999] emphasized that heat fluxes can be important in spreading information throughout the inner magnetosphere. Parallel heat fluxes contribute to magnetosphereionosphere coupling.…”

Section: Introductionmentioning

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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Role of collisionless heat flux in magnetospheric convection

Cited by 29 publications

References 12 publications

Heat flux in magnetospheric convection: A calculation based on adiabatic drift theory

Heat flux in magnetospheric convection: A calculation based on adiabatic drift theory

Relationships of models of the inner magnetosphere to the Rice Convection Model

Ion heat flux and energy transport near the magnetotail neutral sheet

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