aa geomagnetic index
收藏DataCite Commons2023-11-03 更新2024-07-13 收录
下载链接：
https://isgi.unistra.fr/doi/index_aa.php
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资源简介：
Purpose of aa index is to measure the amplitude of global geomagnetic activity during 3-hour intervals normalized to geomagnetic latitude ±50°. aa was introduced to monitor geomagnetic activity over the longest possible time period. aa is derived from the K indices measured at two antipodal observatories. The K indices are converted into amplitudes using mid-class amplitudes (K2aK) then averaged with weighting factors that account for slight changes in geomagnetic disturbance intensities between successive Northern and Southern aa-observatories.
提供机构：
EOST
创建时间：
2023-07-03
