Core field acceleration pulse as a common cause of the 2003 and 2007 geomagnetic jerks

Details Core field acceleration pulse as a common cause of the 2003 and 2007 geomagnetic jerks Core field acceleration pulse as a common cause of the 2003 and 2007 geomagnetic jerks

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3707301c&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 7, CiteID L07301

Physics

4

Geomagnetism And Paleomagnetism: Time Variations: Secular And Longer, Geomagnetism And Paleomagnetism: Core Processes (1213, 8115), Geomagnetism And Paleomagnetism: Satellite Magnetics: Main Field, Crustal Field, External Field

Scientific paper

Using observatory data, we report the detection of a geomagnetic jerk in 2007, which we relate to a jump in the second derivative of the geomagnetic field previously noted in satellite data. Although not of worldwide extent, this jerk is very intense in the South Atlantic region. Using the CHAOS-2 model, we show that both this jerk and the previous 2003 jerk are caused by a single core field acceleration pulse reaching its maximum power near 2006.0. This pulse seems to be simultaneously occurring in several regions of the core surface where it corresponds to dominant n = 5 and 6 spherical harmonic modes. Geometrical attenuation explains why the 2003 and 2007 jerks are local and not fully synchronized at the Earth's surface. Our results suggest that this core field acceleration pulse is the relevant phenomenon to be investigated from the point of view of core dynamics, rather than the jerks themselves.

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