本文件提供了使用极盖磁活动（PC指数）的有效地面信息对输入磁层的太阳风能进行定性估计的指南。 进入磁层的太阳风能量预先决定了磁层扰动的发展:磁暴和亚暴。磁层扰动包括直接影响人类活动的广泛现象和过程，如卫星损坏、对宇航员和航空乘客的辐射危害、电信问题、电力和电子系统的干扰、大气过程的影响以及对人类健康的影响。 本文件旨在在线监测磁层状态，临近预报磁扰动的强度和程度以及高-纬度电离层。PC指数与行星际电场（作为最有效的太阳风参数）之间的密切关系，以及PC指数与磁层扰动之间的密切关系，确定了估计的方法和精度。

This document provides guidelines for specifying the qualitative estimation of the solar wind energy input into the magnetosphere with use of operative ground-based information on the polar cap magnetic activity (PC index). The solar wind energy incoming into the magnetosphere predetermines development of the magnetospheric disturbances: magnetic storms and substorms. Magnetospheric disturbances include a wide range of phenomena and processes directly affecting human activity, such as satellite damage, radiation hazards for astronauts and airline passengers, telecommunication problems, outrages of power and electronic systems, effects in the atmospheric processes, and impact on human health. This document is intended for on-line monitoring the magnetosphere state and nowcasting the intensity and extent of magnetic disturbances as well as parameters of the high-latitude ionosphere. The method and accuracy of estimating is ascertained by close relationship between the PC index and interplanetary electric field (as the most geoeffective solar wind parameter), on the one hand, and between the PC index and magnetoshpheric disturbances, on the other hand.