Geomagnetic field variations recorded at EMMA during the November 2021 geomagnetic storm

This data set contains daily files of 1-sec geomagnetic field variations from 22 stations of the European quasi-Meridional Magnetometer Array (EMMA) collected in the interval 29 October - 8 November 2021. The stations available are AQU, BEL, BRZ, HAN, HLP, IVA, KEV, KIL, LOP, MAS, MUO, NUR, OUJ, PEL, PPN, RAN, RNC, SOD, SUW, TAR, THY, ZAG. The header lines in each file indicate the station name, geodetic coordinates, and the reference frame (HDZ or XYZ). Data are expressed in nanoTesla. Missing data are represented by 99999.99.本数据集收录了欧洲准子午磁强计阵列（European quasi-Meridional Magnetometer Array，简称EMMA）22个观测台站在2021年10月29日至11月8日期间采集的1秒分辨率地磁日变化逐日数据文件。本次可用的观测台站包括：AQU、BEL、BRZ、HAN、HLP、IVA、KEV、KIL、LOP、MAS、MUO、NUR、OUJ、PEL、PPN、RAN、RNC、SOD、SUW、TAR、THY、ZAG。每份数据文件的表头行均标注了对应台站的名称、大地坐标以及参考坐标系（HDZ或XYZ），数据单位为纳特斯拉（nanoTesla），缺失数据以99999.99作为标记值。