World Monthly Means Database Project
World Monthly Means Database Project
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世界月度资料数据库项目
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
Kader Telali
中科院分区：
文献类型：
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作者：
A. Chulliat;Kader Telali
在地磁长期变化研究中，普遍采用观测站月均值。它们提供了比年度平均值更好的时间分辨率，非常适合于研究所谓的地磁突变。虽然在世界发展中心系统内编制年度和小时平均数已经有很长一段时间了，但没有这种按月平均数的传统。该项目旨在通过建立一个公开可用的月度平均收入数据库来填补这一空白。它的动机还在于需要解决WDC中存在的年度和小时平均值之间偶尔出现的不一致问题。首先，我们根据WDC的小时平均值计算了所有INTERMAGNET天文台的月平均值。我们以一种数据格式存储它们，提供有关数据不连续(“JUMP”)的信息，以及数据组件、质量和来源。然后，我们通过系统地将这些数据与世界数据中心的年度平均值和CM4地磁模型的预测进行比较来评估数据的质量(Sabaka等人)。2004年)。虽然大多数数据是有效的，但也出现了一些严重的差异，需要一些天文台修正他们的数据。
Observatory monthly means are widely used for studying geomagnetic secular variation. They provide a better time resolution than annual means and are well suited for investigating the so-called geomagnetic jerks. While annual and hourly means have been compiled for a long time within the WDC system, no such tradition exists for monthly means. This project aims at filling the gap by building a publicly available monthly means database. It is also motivated by the need to resolve occasional inconsistencies between annual and hourly means present in WDCs. To begin with, we computed monthly means for all INTERMAGNET observatories from WDC hourly means. We stored them in a data format providing information on data discontinuities (“jumps”), as well as data components, quality and sources. Then we assessed the quality of the data by systematically comparing them with WDC annual means and with predictions of the CM4 geomagnetic model (Sabaka et al. 2004). Although most of the data are valid, some serious discrepancies arise, requiring that some observatories correct their data.