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Electron temperatures in Saturn's plasma disc

机译：土星等离子体盘中的电子温度

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We present new results concerning electron temperature (T_e) mapping in the inner magnetosphere of Saturn ( < 7 R_s). The data are obtained by the Langmuir Probe (LP) instrument of the Radio and Plasma Wave Science (RPWS) investigation on board Cassini. The study is based on the fourteen first orbits around Saturn, and focus is on cold ( < 10 eV) and dense ( > 5 cm~(-3)) electron populations in the inner plasma torus (plasma disc). Apart from a general increase with distance from Saturn and away from the equatorial plane (latitude), we identify a possibly anisotropic electron temperature in the plasma disc, as well as the presence of photoelectrons from the spacecraft or E-ring dust particles. A polytropic index of γ≈ +0.4 is determined from the observations, which can be used in theoretical models of the plasma disc. We also infer local variations in T_e near the equatorial plane, where the E-ring of dusty plasma and enhancements of water rich neutral gas exist, and determine constraints on the energy source required to heat the electrons in the plasma disc. We suggest that Joule heating or heating by low-frequency plasma waves as well as cooling by neutral gas and E-ring dust are involved in the energy balance, together with Coulomb collision heating by co-rotating ions.
机译：我们提出了有关土星内部磁层（<7 R_s）中电子温度（T_e）映射的新结果。这些数据是通过卡西尼号上的无线电和等离子波科学（RPWS）研究的Langmuir探针（LP）仪器获得的。该研究基于土星周围的第一个14个轨道，重点是内部等离子圆环（等离子圆盘）中的冷（<10 eV）和密集（> 5 cm〜（-3））电子种群。除了随着距土星和赤道平面（纬度）的距离的增加而普遍增加外，我们还确定了等离子体盘中可能存在的各向异性电子温度，以及来自航天器或E环尘埃粒子的光电子的存在。根据观测值确定γ≈+ 0.4的多方性指数，可将其用于等离子盘的理论模型中。我们还推断出赤道平面附近T_e的局部变化，那里存在尘土等离子体的E形环和富含水的中性气体，并确定了加热等离子体盘中电子所需的能源约束。我们建议焦耳加热或通过低频等离子体波加热，以及通过中性气体和E形环粉尘进行冷却，以及通过同向旋转离子进行的库仑碰撞加热，都参与了能量平衡。

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