CEDAR: Mapping Conjugate and Non-Conjugate Convection Response Dating Equinox Intervals

PIS建议使用电离层电动力学同化映射(AMIE)程序推导出三个受干扰的春分周期：1990年3月20-21日、1991年3月23-28日和1992年3月28-29日的电离层电导、电场、电流和焦耳加热图。第一个阶段是大气区域能量学和动力学耦合(Cedar)风暴研究间隔，我们已经开始收集初步数据。第二个周期具有相当大的地球物理意义，因为它紧跟着第22个太阳周期中最大的耀斑事件之一。三颗国防气象卫星计划(DMSP)卫星在此期间观测到了粒子和场的变化。在这段时间内，PI还将获得选定的法布里-珀罗光学数据和地球同步磁层等离子体分析器数据，我们打算将这些数据与高纬度-电动力学模式相关联。1992年3月28日至29日期间也有大量数据，这是一次地球空间环境模拟观测活动。由于4艘DMSP航天器在1992年3月期间运行，该间隔有可能产生有史以来最全面的数据集，用于研究从太阳风到磁层、电离层并最终到中性大气层的大规模电动力学联系。与以前的研究一样，数据将从DMSP粒子和场测量、NOAA粒子测量、非相干散射雷达、相干高频雷达和来自两个半球的地磁观测站获得。这些数据将被同化，以产生电势场分布、水平和场向电流分布以及焦耳加热和电导分布。这项研究的主要目的是：(1)用太阳风参数解释赤道对流大尺度共轭的偏离；(2)记录与IMF显著变化有关的高纬度变化的时间和空间尺度，并将这些变化与磁层观测联系起来；(3)支持新的和正在进行的协调风暴研究(Cedar和GEM)，提供一种在全球范围内解释地方观测的手段。

The PIs propose to use the Assimilative Mapping of Ionospheric Electrodynamics (AMIE) procedure to derive ionospheric conductance, electric filed, current and Joule heating maps for three disturbed equinox periods: 20-21 March 1990, 23-28 March 1991 and 28-29 March 1992. The first period is a Coupling Energetics and Dynamics of Atmospheric Regions (CEDAR) storm study interval for which we have begun initial data collection. The second period is one of considerable geophysical interest because it follows one of the largest flare events of solar cycle 22. Three Defense Meteorological Satellite Program (DMSP) satellites observed particle and field variations during this interval. For this interval the PIs will also acquire selected Fabry-Perot optical data and geosynchronous magnetospheric plasma analyzer data which we intend to correlate with high latitude-electrodynamic patterns. Considerable data also exist for the 28-29 March 1992 interval which was a Geospace Environmental Modelling (GEM) observational campaign. Because four DMSP spacecraft were operating during March 1992, the interval has the potential of producing the most comprehensive data set ever assembled for the study of large scale electrodynamic linkages from the solar wind to the magnetosphere, the ionosphere and ultimately to the neutral atmosphere. As in previous studies data will be acquired from DMSP particle and field measurements, NOAA particle measurements, Incoherent Scatter Radars, Coherent High Frequency Radars, and ground magnetic observatories from both hemispheres. These data will be assimilated to produce electric potential field distributions, horizontal and field-aligned current distributions and Joule heating and conductance distributions. The primary objectives for this study are: (1) providing explanation of deviations from large scale conjugacy in equinoctial convection patterns in terms of solar wind parameters, (2) documenting the temporal and spatial scale of high-latitude variations associated with significant changes of the IMF and correlating these variations with observations in the magnetosphere; (3) supporting new and ongoing coordinated storm studies (CEDAR and GEM) by providing a means for interpreting local observations in a global context.