标题： 木星极地区域的佩德森和霍尔电导率：基于宽带电子能量分布的新图谱 显示英文标题

标题： The Pedersen and Hall Conductances in the Jovian Polar Regions: New Maps based on a Broadband Electron Energy Distribution

摘要： 电离层Pedersen电导率和Hall电导率在理解木星磁层与电离层/热层之间角动量、能量和物质交换中起着重要作用，它们改变了行星的成分和温度。在高纬度区域，这些电导率由于极光电子沉降而增强。研究了类似于通过粒子测量观测到的电子分布的宽带沉降电子能量分布对电导率值的影响。新值与之前研究得到的值进行了比较，特别是当考虑单色分布时。宽带沉降电子能量分布由kappa分布建模，并作为输入用于电子传输模型，该模型计算电离层离子的垂直密度剖面。然后假设电导率主要由H3+和CH5+的密度决定，评估了Pedersen和Hall电导率的垂直剖面。最后，通过将相应的电导率沿高度积分来计算Pedersen和Hall电导率。当考虑宽带电子能量分布而不是单色分布时，Pedersen和Hall电导率在全球范围内更高。此外，使用电子传输模型的直接输出而不是Hiraki和Tao (2008)提出的解析表达式，以及电子碰撞截面的变化，也对电导率值有显著影响。我们结果与从共旋转强制理论推导出的结果之间的比较表明，要么存在物理机制限制场对齐电流，要么沉降到大气中的极光电子也受到与场对齐电流无关的过程加速。 显示英文摘要

摘要： The ionospheric Pedersen and Hall conductances play an important role in understanding the exchanges of angular momentum, energy and matter between the magnetosphere and the ionosphere/thermosphere at Jupiter, modifying the composition and temperature of the planet. In the high latitude regions, these conductances are enhanced by the auroral electron precipitation. The effect of a broadband precipitating electron energy distribution, similar to the observed electron distributions through particle measurements, on the conductance values is investigated. The new values are compared to the ones obtained from previous studies, notably when considering a mono-energetic distribution. The broadband precipitating electron energy distribution is modeled by a kappa distribution, which is used as an input in an electron transport model that computes the density vertical profiles of ionospheric ions. The vertical profiles of the Pedersen and Hall conductivities are then evaluated assuming that the conductivities are mostly governed by the densities of H3+ and CH5+. Finally, the Pedersen and Hall conductances are computed by integrating the corresponding conductivities over altitude. The Pedersen and Hall conductances are globally higher when considering a broadband electron energy distribution rather than a mono-energetic distribution. In addition, the use of the direct outputs of an electron transport model rather than the analytical expression presented in Hiraki and Tao (2008) as well as a change in the electron collision cross-sections also have significant impacts on the conductance values. Comparison between our results and the ones deduced from the corotation enforcement theory suggests that either a physical mechanism limits the field-aligned currents or the auroral electrons precipitating in the atmosphere are also accelerated by processes not associated with the field-aligned currents.