That model of this structure is an alternative to the WMM, which can be found in almost all mobile phones.
Paola de Michelis examined the 1991 "jerk" affecting this structure, tying it in part to the Wolf Number. The CHAMP satellite provided a model of this structure truncated at the 10th degree, yielding 120 coefficients that describe it. That model of this structure is an alternative to the WMM, which can be found in almost all mobile phones. A "knee" in the power-spectrum of this structure was found by Langel and Estes who were examining Mauersberger and Lowes' work that fitted variance of this structure using Gauss coefficients. A westward drift rate of about .2 degrees per a year comprises this structure's secular variation, as given by the IGRF model. The Laschamp Event is one of many excursions that affect the strength of this structure. The Vine-Matthews-Morley Hypothesis theorizes that there are reversals of, for 10 points, what vector field that is generated by Earth's dynamo?
Paola de Michelis examined the 1991 "jerk" affecting this structure, tying it in part to the Wolf Number.
geomagnetic field [accept b-field of the Earth; prompt on B-Field or magnetic field]