SWARM data calibration and validation

SARM 数据校准和验证

• 批准号: NE/H004076/1
• 负责人: Malcolm Dunlop
• 金额: $ 24.19万
• 依托单位: Science and Technology Facilities Council
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2010
• 资助国家: 英国
• 起止时间: 2010 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FH004076%2F1
• 关键词: SWARM; data; calibration; validation

ESA is due to launch the three-satellite mission, SWARM, in 2010 as part of its Earth Explorer programme, which is strategic for the geomagnetic element of Earth Observation. The planned multi-spacecraft formation (in low earth, polar orbit), and payload of magnetic and electric field instruments, are specifically designed to study all contributions to the near-Earth magnetic field, including the internally generated and surface (Lithospheric) geomagnetic field, and the externally influenced ionospheric and magnetospheric fields; together with their associated electric current systems. The key difference in the mission design of SWARM over previous low orbit missions (e.g. Champ and Öersted), is its multi-spacecraft nature, which allows gradient and partial current estimates to be made directly, in-situ. These measurements are critical to capture and distinguish the time-variability of the geomagnetic field, which otherwise inherently limits the accuracy of field models developed from single spacecraft missions (despite the high precision measurements now available). A key mission aim of SWARM is therefore to map the ionospheric current system, linking into the magnetosphere, and monitor behaviour directly to better understand the responses of the Earth's environment. The essentially anisotropic conductivity, and field aligned linkage of currents, requires multi-point measurements of both the magnetic and electric field, and these observations also provide continuous monitoring of the impact of space weather; potentially completing a full solar cycle of previous magnetic measurements. The exploration intended by the SWARM mission, both to survey the geomagnetic field and to distinguish the various dynamic sources contributing to the mechanisms of energy transfer in the Earth's environment, is therefore of high interest, and has close relevance to NCEO aims. ESA plans to present no-cost AOs for guest investigators to validate SWARM data products, who will thereby gain access to the SWARM data set a year before public release. It is therefore desirable to position the UK community to respond to these AOs, which assume national funding will be sought. NCEO funding for this mission support activity, as applied for here, would achieve this. The calibration and analysis techniques will be developed from knowledge gained through the operation of the four-spacecraft Cluster (and other) spacecraft (which can provide determination of electric current density, for example), while verification of the electric field will exploit existing methods, using ionospheric data from the EISCAT radar and SuperDARN network (which can provide reference electric field values through the measured global convection flows). Cluster has provided vital lessons for access, validation and use of SWARM data; multi-point techniques will maximise the science return, while the radar network provides a global interpretation for the in situ observations. On this basis, extensive studies can be performed to qualify and exploit the SWARM dataset through and beyond the mission operations.

欧空局将于2010年发射三颗卫星SWARM任务，作为其地球探测计划的一部分，该计划对地球观测的地磁元素具有战略意义。计划中的多航天器编队（在近地、极轨道）以及磁场和电场仪器的有效载荷专门用于研究对近地磁场的所有贡献，包括内部产生的和表面（岩石圈）地磁场，以及受外部影响的电离层和磁层场；连同它们相关的电流系统。SWARM任务设计与以前的低轨道任务（例如Champ和Öersted）的关键区别在于它的多航天器性质，这允许直接在现场进行梯度和部分电流估计。这些测量对于捕获和区分地磁场的时间变异性至关重要，否则就会固有地限制由单个航天器任务开发的磁场模型的准确性（尽管现在可以获得高精度测量）。因此，SWARM的一个关键任务目标是绘制与磁层相连的电离层电流系统，并直接监测其行为，以更好地了解地球环境的反应。本质上各向异性的电导率和电流的场向联动需要对磁场和电场进行多点测量，这些观测还提供了对空间天气影响的连续监测；有可能完成之前磁场测量的完整太阳周期。因此，SWARM任务所打算进行的勘探，既要调查地磁场，又要区分有助于地球环境中能量转移机制的各种动力源，具有很高的意义，并且与NCEO的目标密切相关。欧空局计划为客座研究人员提供免费的aoo，以验证SWARM数据产品，因此他们将在公开发布前一年获得SWARM数据集。因此，让英国社会对这些aoo做出回应是可取的，这些aoo假定将寻求国家资助。非政府组织为这项特派团支助活动提供的资金，如在此申请的，将达到这一目的。校准和分析技术将根据四航天器集群（和其他）航天器（例如，它可以提供电流密度的测定）的操作所获得的知识进行开发，而电场的验证将利用现有方法，使用来自EISCAT雷达和SuperDARN网络的电离层数据（它可以通过测量的全球对流流提供参考电场值）。Cluster为获取、验证和使用SWARM数据提供了重要的经验教训；多点技术将使科学回报最大化，而雷达网络为现场观测提供全球解释。在此基础上，可以进行广泛的研究，以在任务操作前后验证和利用SWARM数据集。

项目成果

Multispacecraft current estimates at swarm

• DOI: 10.1002/2015ja021707
• 发表时间: 2015-10
• 期刊: Journal of Geophysical Research: Space Physics
• 作者: Malcolm Dunlop;Y. Y. Yang-Y.;J. Yang;Hermann Lühr;Chao Shen;Nils Olsen;Patricia Ritter;Qing-He Zh

The relations between density of FACs in the plasma sheet boundary layers and Kp index

等离子体片边界层FAC密度与Kp指数的关系

• DOI: 10.1007/s11431-011-4545-3
• 发表时间: 2011-08
• 期刊: Sci China Ser E-Tech Sci
• 作者: 程征伟

The statistical studies of the inner boundary of plasma sheet

等离子体片内边界的统计研究

• DOI: 10.5194/angeo-29-289-2011
• 发表时间: 2011-02
• 期刊: Annales Geophysicae
• 影响因子: 1.9
• 作者: J. B. Cao;W. Z. Ding
• 通讯作者: W. Z. Ding

Corrigendum to "The statistical studies of the inner boundary of plasma sheet" published in Ann. Geophys., 29, 289-298, 2011

更正

• DOI: 10.5194/angeo-29-349-2011
• 发表时间: 2011
• 期刊: Annales Geophysicae
• 影响因子: 1.9
• 作者: Cao J

Influences of the interplanetary magnetic field clock angle and cone angle on the field-aligned currents in the magnetotail

行星际磁场钟角和锥角对磁尾磁场对准电流的影响

• DOI: 10.1002/2013gl056737
• 发表时间: 2013-10-28
• 期刊: GEOPHYSICAL RESEARCH LETTERS
• 影响因子: 5.2
• 作者: Cheng, Z. W.;Shi, J. K.;Liu, Z. X.
• 通讯作者: Liu, Z. X.