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Geomagnetic Reversal underway?


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Home Forums Campfire The Natural World Geomagnetic Reversal underway?

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  • #3577376
    Steve S.
    BPL Member

    @wildegeek

    Before you trust your compass for critical navigation, be sure to check the current declination for the maps in your area!

    The somewhat overdue Geomagnetic Reversal (periodic flip of the Earth’s magnetic poles) seems to be fully underway.

    #3577377
    humorless
    BPL Member

    @sleeping

    Locale: The Cascades

    Also discussed on BPL here.

    #3577443
    Rex Sanders
    BPL Member

    @rex

    From NOAA:

    Is Earth’s magnetic field going to reverse?

    While we now appear to be in a period of declining magnetic field strength, we cannot state for certain if or when a magnetic reversal will occur.

    Based on measurements of the Earth’s magnetic field taken since about 1850 some paleomagnetists estimate that the dipole moment will decay in about 1,300 years. However, the present dipole moment (a measure of how strong the magnetic field is) is actually higher than it has been for most of the last 50,000 years and the current decline could reverse at any time. Even if Earth’s magnetic field is beginning a reversal, it would still take several thousand years to complete a reversal. We expect Earth would still have a magnetic field during a reversal, but it would be weaker than normal with multiple magnetic poles. Radio communication would deteriorate, navigation by magnetic compass would be difficult and migratory animals might have problems.

    https://www.ngdc.noaa.gov/geomag/faqgeom.shtml#Is_Earths_magnetic_field_going_to_reverse

    Also, the Earth’s magnetic field is pretty messy. For example, here’s the updated 2019 compass declination map of the world.

    https://www.ngdc.noaa.gov/geomag/WMM/DoDWMM.shtml

    — Rex

    #3577450
    Erica R
    BPL Member

    @erica_rcharter-net

    Looks like there are 2 magnetic poles in antarctica:  https://www.youtube.com/watch?v=j7LqqvTmnVM

     

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