Permanent monitoring and real-time indexing of the geomagnetic activity is of utmost importance for space weather services. In particular, providing a continuous and reliable local magnetic activity nowcast is of increasing importance as it can be used to generate alerts for various users, for instance for GNSS-based applications or to protect electric power grids. This study presents a novel nowcast system for calculating a K-type index of the local magnetic activity in Belgium. This includes a fully automated computer procedure for digital magnetogram data acquisition, data cleaning, calculating the index, displaying the results, and possibly issuing an alert to interested users, if the storm-level activity is identified. Novel characteristics are the higher cadence of index calculation, an index reliability estimate based on data quality, and the high availability of the nowcast guaranteed by the operation of two identical instruments at observatories in close proximity. An evaluation of the index nowcast accuracy was carried out, and its results are also presented.

中文翻译：

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基于两个近距离观测站同时测量的局部磁活动指数临近预报

地磁活动的永久监测和实时索引对于空间天气服务至关重要。特别是，提供连续和可靠的本地磁活动临近预报变得越来越重要，因为它可用于为各种用户生成警报，例如基于 GNSS 的应用程序或保护电网。本研究提出了一种新的临近预报系统，用于计算K- 比利时当地磁活动的类型指数。这包括用于数字磁图数据采集、数据清理、计算指数、显示结果以及可能向感兴趣的用户发出警报（如果确定风暴级别活动）的全自动计算机程序。新颖的特点是指数计算的更高节奏、基于数据质量的指数可靠性估计，以及临近观测站运行两个相同仪器所保证的临近预报的高可用性。对指数临近预报的准确性进行了评估，并给出了其结果。