常用短語

magnetic annual variation磁周年差；磁年差

annual variation rate年變率

geomagnetic annual variation地磁年變化

annual variation anomaly高溫年變

annual variation of pressure氣壓的年變化

lunar annual variation月球年變化

semi-annual variation電離層半年變化

annual magnetic variation周年磁變；年磁變；磁周年差；年磁差

amplitude of annual variation年較差