This data set contains daily files of 1-sec geomagnetic field variations from 28 stations of the European quasi-Meridional Magnetometer Array (EMMA) collected on selected periods in the year interval 2012–2017. The periods considered and the stations available for each one of them are the following: 2012/09/22-2012/12/01 AQU,BEL,BRZ,HAN,IVA,KEV,KIL,MAS,MEK,MUO,NUR,OUJ,PEL,RNC,SOD,SUW,SZC,TAR,ZAG 2013/03/13-2013/03/27 AQU,BEL,BRZ,HAN,HLP,IVA,KEV,KIL,MAS,MEK,MUO,NCK,NU2,OUJ,PEL,RNC,SOD,SUW,SZC,TAR,THY,ZAG 2013/05/25-2013/06/11 AQU,BEL,BRZ,CST,HAN,IVA,KEV,MAS,MEK,MUO,NCK,NU2,NUR,OUJ,PEL,RNC,SOD,SUW,TAR,ZAG 2014/02/14-2014/03/09 BEL,BRZ,HAN,IVA,KEV,KIL,LOP,MAS,MEK,MUO,NU2,OUJ,PEL,SOD,SUW,TAR,THY,VYH,ZAG 2015/03/13-2015/03/31 BEL,BRZ,CST,HAN,HLP,IVA,KEV,MAS,MEK,MUO,NU2,OUJ,PEL,PPN,RNC,SOD,SUW,TAR,THY,VYH,ZAG 2015/06/18-2015/06/27 BEL,BRZ,HAN,HLP,IVA,KEV,LOP,MAS,MEK,MUO,NU2,OUJ,PEL,RAN,SOD,SUW,TAR,THY,VYH,ZAG 2017/05/26-2017/06/02 AQU,BEL,BRZ,HAN,IVA,KEV,KIL,LOP,MAS,MUO,NUR,OUJ,PEL,RAN,RNC,SOD,SUW,TAR,THY,VYH,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.