Evidence for persistent 7000- and 3500-year geomagnetic oscillations

Details Evidence for persistent 7000- and 3500-year geomagnetic oscillations Evidence for persistent 7000- and 3500-year geomagnetic oscillations

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29h..61s&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 8, pp. 61-1, CiteID 1220, DOI 10.1029/2002GL014734

Physics

Geomagnetism And Paleomagnetism: Archeomagnetism, Geochemistry: Geochronology, Interplanetary Physics: Cosmic Rays, Geomagnetism And Paleomagnetism: Time Variations-Secular And Long Term, Geomagnetism And Paleomagnetism: Paleointensity

Scientific paper

A 14,500-year record of atmospheric 14C contains evidence for 7000- and 3500- year oscillations. Since the Holocene archaeomagnetic record also contains features consistent with a 7000-year cycle, a likely explanation is that the 14C data are recording modulation of cosmogenic isotope production due to variations in geomagnetic shielding. A longer-term 36Cl record contains evidence for similar periodicities, suggesting that these geomagnetic variations may have been present for tens of millennia.

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