Photos
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Vidéos
Every Rock has a Story #6: Climate
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Virtual Field Trip: Pillow lava in the Marin Headlands
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Video: Earth’s magnetic field changes over time. Earth is surrounded by a constantly changing magnetic field that shields our habitat against harmful radiation from cosmic rays and the solar wind. A new study in AGU’s journal Reviews of Geophysics summarizes what scientists currently know about how Earth’s magnetic field has evolved over the past 100,000 years. This animation shows how the intensity of Earth’s magnetic field changed from 44,000 to 38,000 years ago. Around 41,000 years ago, a geomagnetic excursion happened, when the global geomagnetic field intensity reduced dramatically. This event, known as the Laschamp excursion, is the best-documented geomagnetic excursion; evidence of it has been found in geological records around the world. You can see the intensity of the field change from pink (strong) to white (weak) as time progresses. Credit: Alexander Jordan, GFZ Potsdam. Read more about the evolution of Earth’s magnetic field on eos.org: https://eos.org/editors-vox/the-global-geomagnetic-field-of-the-past-hundred-thousand-years Read the Reviews of Geophysics study here: https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019RG000656
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