Magnetospheric Boundary Identification from Energetic Particle Measurements on Polar-Orbiting Satellites

我们已经确定了两个重要的磁层边界区域，即低纬度边界层（LLBL）和尖端，可以从高能粒子观测和极轨卫星的磁鞘能量粒子降水观测中识别出来。我们建议分析从S3-3卫星获得的磁鞘能量粒子的同步观测，以识别这些边界区域，分析这些边界区域内发生的过程，并研究这些区域从磁层到电离层的映射。我们将比较使用Newell和孟ı1988！对于磁鞘能粒子。通过这种方式，我们将研究这两种技术的准确性，并确定使用高能粒子测量来补充和验证使用Newell和孟标准可获得的识别的优势。此外，利用测量到的粒子角分布，我们将研究LLBL位于闭合场线上的程度，并估计极光加速区域相对于每个磁层边界区域和开闭场线边界的位置。我们还建议确定区分LLBL降水和等离子体片边界层降水的标准。我们将使用这些准则来研究这两个边界层之间映射到电离层的重要转变。利用S3-3的电场和磁场数据，我们计划研究对流反转、场偶联电流、不同边界区域和开合场线边界之间的空间关系。通过这种方式，我们希望获得关于重联与粘性相互作用产生磁层电场的程度以及关于日侧场向电流的产生区域的重要信息。最后，利用几乎同轨运行的相同仪器DMSP F6和F8卫星的降水数据，我们将在日侧边界层内小至10km的纬度尺度上追求时空效应的分离。

We have determined that two important magnetospheric boundary regions on the side, the low-latitude boundary layer (LLBL) and the cusp, can be identified from energetic particle observations as well as from observations of magnetosheath-energy particle precipitation on polar-orbiting satellites. We propose to analyze simultaneous observations of magnetosheath energy particles obtained from the S3-3 satellite in order to identify these boundary regions, to analyze processes occurring within these boundary regions, and to investigate the mapping of these regions from the magnetosphere to the ionosphere. We will compare the identification obtined using the criteria developed be Newell and Meng ı1988! for magnetosheath-energy particles. In this way, we will investigate the accuracy of both techniques as well as determine the advantages of using energetic particle measurements to supplement and verify the identification obtainable using the Newell and Meng criteria. In addition, using the measured angular distributions of particles, we will investigate the extent to which the LLBL lies on closed field lines and estimate the locations of auroral acceleration regions relative to each of the magnetospheric boundary regions and to the open-closed field line boundary. We also propose to determine criteria for distinguishing between precipitation from the LLBL and that from the plasma sheet boundary layer. We will use the criteria to study the important transition between these two boundary layers as mapped to the ionosphere. Using the electric and magnetic field data from S3-3, we plan to study the spatial relations between the convection reversal, field-ligned currents, the different boundary regions, and the open-closed field line boundary. In this way, we hope to gain significant information on the extent to which the magnetospheric electric field is generated by reconnection versus viscous interaction and on the generation regions for day side field-aligned currents. Finally, using precipitation data from the identically instrumented, almost co-orbiting, DMSP F6 and F8 satellites, we will pursue the separation of temporal and spatial effects over latitudinal scale sizes as small as 10km within the day side boundary layers.