A method for the near real-time production of quasi-definitive magnetic observatory data
A method for the near real-time production of quasi-definitive magnetic observatory data
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DOI：
10.5047/eps.2013.10.001
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发表时间：
2013-01-01
影响因子：
3
通讯作者：
Turbitt, Chris W.
中科院分区：
文献类型：
--
作者：
Clarke, Ellen;Baillie, Orsi;Turbitt, Chris W.
磁观测数据被广泛应用于时变磁场模型的推导，通常在可用时与卫星磁数据相结合。传统上使用的是权威的天文台结果，这些结果的可用性往往比卫星数据晚几个月甚至几年。最近定义的准确定天文台数据类型已经引入，以满足在更快速的时间框架内提供适合用于现场建模的天文台数据的需要，并为即将到来的欧洲航天局蜂群任务生产计划中的2级产品。提出了一种产生准确定性数据的方法，并描述了基本步骤。为了评估该方法，将自2000年以来隔天发布的临时数据与INTERMAGNET 5个观测站的确定数据进行比较。候选准确定和确定数据之间差异的平均值和标准差在INTERMAGNET设定的5 nT精度范围内。由于测试数据第二天就可以在网上发布，因此它们也很容易满足INTERMAGNET对三个月内可用性的要求。这些结果表明，对于已经达到INTERMAGNET设定的标准的天文台来说，迅速产生准确定数据是可能的。
Magnetic observatory data are widely used in the derivation of time-varying magnetic field models, often in combination with satellite magnetic data, when available. Traditionally the definitive observatory results are used, the availability of which can often lag those of the satellite data by months and even years. The recently defined quasi-definitive observatory data type has been introduced to meet the need to provide observatory data suitable for use in field modeling in a more rapid time frame and for producing Level 2 products planned for the upcoming European Space Agency Swarm mission. A method for producing quasi-definitive data is presented and the essential steps described. To evaluate the method, provisional data published on a next day basis since 2000 are tested against definitive data at five INTERMAGNET observatories. The means and standard deviations of the differences between the candidate quasi-definitive and definitive data are within the accuracy of 5 nT set by INTERMAGNET. Since the tested data were published on-line on a next day basis, they also easily meet the INTERMAGNET requirement of availability within three months. These results demonstrate that prompt production of quasi-definitive data is possible for observatories that already perform to the standards set by INTERMAGNET.