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首页> 外文会议>URSI General Assembly and Scientific Symposium >Imaging the plasmasphere with ground based GPS TEC observations and comparisons with in situ plasmaspheric observations with Van Allen Probes
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Imaging the plasmasphere with ground based GPS TEC observations and comparisons with in situ plasmaspheric observations with Van Allen Probes

机译：用基于地面的GPS TEC观测和与van Allen探针的原位血浆观测成像与地面的GPS TEC观测和比较

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For over a decade, incoherent scatter radar observations of the mid and auroral-latitude ionosphere combined with ground based GPS observations of total electron content (TEC) have been used to study the intense storm enhanced density (SED) plumes that form over the Americas during major geomagnetic storms [1]. Magnetic field mapping of the ionospheric observations to magnetospheric heights revealed close correspondence between the SED and plasmasphere erosion plumes observed from space in EUV imagery by the IMAGE satellite [2]. During the current solar cycle the global distribution of GPS receivers used in creating the TEC maps and movies has increased significantly providing near-continuous two-dimensional coverage of TEC morphology and dynamics over much the northern hemisphere mid and high-latitude region. The dynamics and structure of the outer reaches of the plasmasphere, the plasmasphere boundary layer, are driven by coupling to overlying magnetospheric processes. To first order, cold plasma redistribution proceeds such that plasma parcels at ionospheric heights and at the apex of a magnetic field line move together in the E × B direction maintaining their magnetic field alignment. In this sense the TEC structure and dynamics imaged in the ionosphere projects along the magnetic field providing an image of the plasmaspheric configuration. The recently launched Van Allen Probes twin satellites (RBSP-A & RBSP-B) are in near-equatorial orbits well suited for studies of phenomena at the apex of field lines threading the plasmasphere boundary layer. The RBSP instrumentation includes in situ electric field, density, ion composition, magnetic field, plasma wave, and full particle pitch angle and energy spectral information from <1 eV to 10s of MeV for ions and electrons. We use ground based TEC mapping to create 2-D images of the plasmasphere during transits of the RBSP and Themis spacecraft. We intercompare the dynamic changes in the plasmasphe- e configuration with the detailed in situ observations. We image and observe the transition from quiet plasmasphere, to erosion plume formation and development, to recovery. The RBSP spacecraft provide quantitative measurements of ion composition and erosion flux within the plume and the mapping between low and high altitudes facilitates intercomparisons between ionospheric and magnetospheric characteristics and phenomena.
机译：十多年来，中期和极光纬度的非相干散射雷达观测电离层中与电子总含量（TEC）的基于地面的GPS观测组合已被用于研究强烈风暴增强密度（SED）期间烟羽形式在美洲主要磁暴[1]。电离层观测磁层高度的磁场作图揭示的SED和由图像卫星[2]在EUV图像从空间观察到等离子体层侵蚀之间的羽毛密切的对应。在目前的太阳活动周期中创建TEC地图和电影使用的GPS接收器的全球分布增加显著提供TEC形态和动态的近乎连续的二维覆盖了北半球中高纬度地区。动态和等离子层时，等离子体层边界层的外下游的结构中，通过连接到上覆磁层过程驱动。一阶，冷等离子体再分配前进，使得在电离层高度和在磁场线移动在E顶点一起等离子体包裹×B方向保持它们的磁场对准。在这个意义上的TEC结构和动力学成像在沿着磁场提供所述等离子体层结构的图像的电离层的项目。最近推出的范艾伦探测器双卫星（RBSP-A＆RBSP-B）是在磁力线穿线等离子体层边界层顶点非常适合的现象进行研究近赤道轨道。在RBSP仪器原位包括电场，密度，离子组成，磁场，等离子体波，全粒子俯仰角和能量从<1电子伏特为离子和电子兆电子伏10S光谱信息。我们使用基于地面TEC映射RBSP和忒弥斯太空船的转变过程中创建的等离子体层的2-d的图像。我们intercompare与现场观测的详细的plasmasphe- E构型的动态变化。我们拍摄观察从安静的等离子层的过渡，侵蚀羽的形成和发展，为恢复。在RBSP宇宙飞船提供羽流内的离子组合物和侵蚀通量和促进电离层和磁层特征和现象之间比对低和高海拔地区之间的映射的定量测量。

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