Separating the magnetospheric disturbance magnetic field into external and transient internal contributions using a 1D conductivity model of the Earth

Details Separating the magnetospheric disturbance magnetic field into external and transient internal contributions using a 1D conductivity model of the Earth Separating the magnetospheric disturbance magnetic field into external and transient internal contributions using a 1D conductivity model of the Earth

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3112614m&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 12, CiteID L12614

Physics

8

Geomagnetism And Paleomagnetism: Geomagnetic Induction, Geomagnetism And Paleomagnetism: Time Variations-Diurnal To Secular, Magnetospheric Physics: Ring Current

Scientific paper

Magnetospheric fields and their induced counterparts are the largest source of error in models representing the geomagnetic field. Of particular concern is the current practice of coupling the internal induced field for convenience to the external field by a real constant, independent of the frequency content of the external inducing source. The error introduced into field models by this simplified representation is of the order of 5 nT on average. Here, we propose an accurate representation of the symmetric part of the disturbance field which is easy to implement. Using a 1D conductivity model of the Earth, we split the disturbance Dst index into two new indices, Est and Ist, which track the transient evolution of the symmetric part of the external and induced disturbance field. The ensuing Dst-based transient correction for geomagnetic field models is in remarkable agreement with the transient effect observed in CHAMP, Ørsted and SAC-C satellite magnetic measurements.

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