LONG-TERM FEATURES OF DRIFTING AND STANDING NON-DIPOLE FIELDS AS DETERMINED FROM HOLOCENE PALEOMAGNETIC SECULAR VARIATIONS

Geomagnetic field motions of Holocene secular variations are investiga ted using a separation method, The palaeomagnetic secular variations f rom Britain, North America and Australia have been subjected to maximu m-entropy method analyses. Based on the results of spectral analyses, the secular variations are separated by band-pass filters into low-fre quency components, generally including the period band 1800-3600 yr, a nd high-frequency components, generally including the period band 1000 -1200 yr. There is an interval, from 4200 to 1700 yr BP, which shows c lockwise rotational motions in the low-frequency components of all thr ee sites, Westward drifting of geomagnetic fields mag be globally domi nant. Swinging or elliptical looping motions constrained to a certain direction were observed in the low-frequency components of the British data, The time duration for the persistence of the swinging motion co nstrained to a certain direction was 3500 years or so, which could be the lifetime of an oscillating stationary field. The duration of the t ransitional motion was 1000-1300 years, which may indicate the recurre nce time of a stationary field.