Evaluation of Satellite Magnetic Field Data: Currents and Waves

拟议的研究计划包括分析瑞典Viking和Freja卫星以及国防部Hilat、北极熊、DMSP-F7和Triad卫星获得的磁场数据。我们打算将这些数据与NASA AMPTE/CCE和MAGSAT卫星的磁场观测相关联地用于研究地球大小尺度的磁层和电离层电流系统以及磁波现象。我们建议对比一下风暴活跃时期和磁场平静时期的全球电流系统。对MAGSAT资料进行了遥感二维水平流分析，并与赤道CCE结果进行了匹配。这些结果是初步的，我们建议完善、改进并将这种分析技术应用于其他涉及动态电路的情况。我们还建议在向北的行星际磁场条件下确定完整的三维电离层-磁层电流系统。最重要的结果，也是仍然存在的问题是，在所研究的情况下，向北的BZ(NBZ)电流被限制在80度以上，而在其他情况下，极地电流与极光带电流系统连接(或不连接)。我们打算研究极光加速过程中所涉及的细尺度伯克兰德流，特别是在风暴和亚风暴电路的背景下。我们建议继续分析过渡到波动现象所涉及的较短时间尺度的扰动。将进行研究的一些波场主题包括：全球磁流体动力学共振和/或驱动脉动；本地和远程粒子场回旋相互作用；为研究太阳风压变化造成的全球扰动而进行的多卫星MFE数据分析；来自地面和航天器数据的超低频波的统计分析；超低频波传播，包括非相干脉动活动；以及GOES和CCE航天器对极低频事件的联合研究。我们打算像过去一样，通过科学期刊发表、演讲以及与个别科学家和机构计划的合作努力来传播数据和信息。我们建议将即将进行的弗赖亚飞行任务数据纳入这项分析工作，就像我们对以前的磁场数据集所做的那样。扩大的FREJA数据覆盖面将与其他方案很好地协调，特别是全球创业板方案和国际STEP方案，并提供更完整的MFE数据库。高分辨率的实时数据将推进我们当前的细尺度和大尺度研究，专用波道将提高我们评估海浪扰动场的能力。

The proposed research program involves the analysis of magnetic field data acquired by the Swedish Viking and FREJA satellites and by the DoD HILAT, Polar BEAR, DMSP-F7, and TRIAD satellites. We intend to use these data in correlation with magnetic field observations from the NASA AMPTE/CCE and MAGSAT satellites in studies of the earth's magnetospheric and ionospheric current systems, both large and small scale, as well as magnetic wave phenomena. We propose to contrast the global current systems during active storm times vs. magnetically quiet times. A remote sensing, two-dimensional, horizontal current analysis has been performed on the MAGSAT data and matched to equatorial CCE results. These results are preliminary and we propose to complete, improve and apply this analysis technique to other cases involving dynamic circuits. We propose to determine the full three-dimensional ionospheric-magnetospheric current system during northward interplanetary magnetic field conditions as well. The most significant result and, also, remaining question is the confinement of the northward Bz (NBZ) currents to above 80 degrees in the case studied and the connection (or lack of connection) of the polar currents to the auroral zone current system for other cases. We intend to study the fine scale Birkeland currents involved in auroral acceleration processes, especially in the context of the storm and substorm circuit. We propose to continue our analysis of shorter time scale disturbances involved in the transition to wave phenomena. Some of the wave field subjects to be studied include: global MHD resonant and/or driven pulsations; local and remote particle-field cyclotron interactions; multi-satellite MFE data analysis to study global perturbations caused by solar wind pressure variations; statistical analysis of ULF waves from ground and spacecraft data; ULF wave propagation, including incoherent pulsation activity; and GOES and CCE spacecraft conjunction studies of ULF events. We intend to disseminate data and information by way of scientific journal publication, presentations, and collaborative efforts with individual scientists and agency program as we have done in the past. We propose to incorporate the upcoming FREJA mission data into this analysis effort as we have done with previous magnetic field data sets. The expanded FREJA data coverage will coordinate well with other programs, especially GEM and the internation STEP programs, as well as provide a maore complete MFE data base. The high resolution realtime data will advance our fine-scale as well as large-scale current studies and the dedicated wave channels will improve our ability to evaluate wave disturbance fields.