Comment to the article:
Guyodo Yohan and Valet Jean-Pierre. 1999.
Global changes in intensity of the Earth's magnetic field
during the past 800 kyr.
Nature, VOL. 399, 20 May 1999. Pages 249-252.
Page 251, Figure 3b:
Power spectrum of Earth's magnetic field intensity: 0-800 kyr
shows two significant peaks (Measured from the Fig 3b, accuracy +- 0.1 mm):
6.9 mm corresponds 0.009324324 (kyr^(-1)) which corresponds about 110000 yr. 2.2 mm corresponds 0.002972972 (kyr^(-1)) which corresponds about 340000 yr. (7.4 mm corresponds 0.01 (kyr^(-1)) which corresponds 100000 yr.)
"There is no correlation between intensity dips and cold climate events."
p. 251.
Comment also: Pole changes of Earth's magnetic field is aperiodic.
Some external event perhaps warms Earth's interior periodically:
300000 yr and 100000 yr ?
Best Regards,
Hannu Poropudas
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