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  • COMMENT: Global changes in intensity of Earth's magnetic field during t

    From Hannu Poropudas@21:1/5 to All on Mon Oct 21 23:39:52 2019
    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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  • From Hannu Poropudas@21:1/5 to Hannu Poropudas on Tue Oct 29 23:48:36 2019
    On Tuesday, October 22, 2019 at 9:39:54 AM UTC+3, Hannu Poropudas wrote:
    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

    0-800 kyr time span contain maybe only two 300000 yr events so
    spectum peak is more uncertain than 100000 yr events case.
    This possibility should be investigated longer period than 0-800 kyr.

    Hannu

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