Using observatory data to characterise geomagnetic daily variations

Hamilton, Brian; Macmillan, Susan. 2007 Using observatory data to characterise geomagnetic daily variations. [Poster] In: XXIV IUGG General Assembly 2007, Perugia, Italy, July 2007. (Unpublished)

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Abstract/Summary

We use data from several geomagnetic observatories to derive a series of Fourier harmonic models of the daily magnetic field variations. We form the models from datasets omprising selected numbers of International Quiet Days from each month, from different years in the solar cycle, and across a range of geomagnetic latitudes. The performances of the models are assessed by comparing their predictions with the input data. We comment on the improvement in daily magnetic field estimates over purely main field models for different seasons, solar cycle phases, and geographic latitudes. We also investigate how the models depend on the number of International Quiet Days used. Comparisons are made with the Comprehensive Model version 4; a global model that, unlike our approach, separates ionospheric sources using satellite data as well as observatory data.

Item Type:	Publication - Conference Item (Poster)
Programmes:	BGS Programmes > Seismology and Geomagnetism
NORA Subject Terms:	Earth Sciences
Date made live:	26 Oct 2012 08:57 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/20110

Item Type:

Publication - Conference Item (Poster)

Programmes:

BGS Programmes > Seismology and Geomagnetism

NORA Subject Terms:

Earth Sciences

Date made live:

26 Oct 2012 08:57 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/20110