TY  - GEN
AU  - Campbell, Wallace H.
TI  - Quiet ionospheric currents of the Northern Hemisphere derived from geomagnetic field records
KW  - SISTEMA DE CORRENTE-S9
KW  - IONOSFERA
KW  - ESTRUTURA DA ATMOSFERA
KW  - 551.510.535
KW  - med
KW  - fre
KW  - 550.385.26
ER  -