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- W2028408069 abstract "[1] We consider the electron distribution in current sheets observed by Cluster mission in the Earth magnetotail. We use the statistics of 70 fast (less than 20 minutes) and 12 slow (more than one hour) crossings of horizontal current sheets. We demonstrate that for both types electron temperature decreases with increase of magnetic field ∣Bx∣ away from the current sheet center. We use the approximations Te⊥/Te⊥ max ≈ 1 − αT⊥(Bx/Bext)2 and Te∥/Te∥ max ≈ 1 − αT∥(Bx/Bext)2, where Bext is value of Bx in the lobes. For statistics of thin current sheets (fast crossings) we obtain mean values 〈αT⊥〉 ≈ 〈αT∥〉 ≈ 1. For thick current sheets (slow crossings) we also obtain 〈αT⊥〉 ≈ 〈αT∥〉, but 〈αT⊥〉, 〈αT∥〉 > 1. The electron temperature anisotropy is about Te∥/Te⊥ = 1.1 − 1.2 and vertical profiles Te∥/Te⊥ ≈ const. Observed vertical distributions of Te∥ and Te⊥ are described by the analytical model of electron heating in the course of the earthward convection in thin current sheets with (Bx(z), Bz(x)) and in thick current sheets with (Bx(x, z), Bz(x, z)). We also show that the observed electron temperature anisotropy is provided by the electron population in the energy range between 50 ev and 3 keV. The cold core of electron distribution ( 5 keV) has Te∥/Te⊥ ∼ 1 or even Te∥/Te⊥ < 1. We consider electron pressure tensor in observed thin current sheets and demonstrate that electron velocity distribution is gyrotropic with high accuracy." @default.
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- W2028408069 date "2012-06-01" @default.
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- W2028408069 title "Adiabatic electron heating in the magnetotail current sheet: Cluster observations and analytical models" @default.
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- W2028408069 doi "https://doi.org/10.1029/2012ja017513" @default.
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