The impact of century-scale changes in the core magnetic field on external magnetic field contributions
Cnossen, Ingrid 
ORCID: https://orcid.org/0000-0001-6469-7861.
2017
The impact of century-scale changes in the core magnetic field on external magnetic field contributions.
Space Science Reviews, 206 (1-4).
259-280.
https://doi.org/10.1007/s11214-016-0276-x
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This is a post-peer-review, pre-copyedit version of an article published in Space Science Reviews. The final authenticated version is available online at: http://dx.doi.org/10.1007/s11214-016-0276-x Cnossen_2017.pdf - Accepted Version Download (6MB) | Preview |
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Abstract/Summary
The Earth’s internal magnetic field controls to a degree the strength, geographic positioning, and structure of currents flowing in the ionosphere and magnetosphere, which produce their own (external) magnetic fields. The secular variation of the Earth’s internal magnetic field can therefore lead to long-term changes in the externally produced magnetic field as well. Here we will examine this more closely. First, we obtain scaling relations to describe how the strength of magnetic perturbations associated with various different current systems in the ionosphere and magnetosphere depends on the internal magnetic field intensity. Second, we discuss how changes in the orientation of a simple dipolar magnetic field will affect the current systems. Third, we use model simulations to study how actual changes in the Earth’s internal magnetic field between 1908 and 2008 have affected some of the relevant current systems. The influence of the internal magnetic field on low- to mid-latitude currents in the ionosphere is relatively well understood, while the effects on high-latitude current systems and currents in the magnetosphere still pose considerable challenges.
| Item Type: | Publication - Article |
|---|---|
| Digital Object Identifier (DOI): | https://doi.org/10.1007/s11214-016-0276-x |
| Programmes: | BAS Programmes > BAS Programmes 2015 > Space Weather and Atmosphere |
| ISSN: | 0038-6308 |
| Additional Keywords: | magnetic field, magnetosphere, ionosphere, secular variation, current systems |
| Date made live: | 23 Aug 2016 13:32 +0 (UTC) |
| URI: | https://nora.nerc.ac.uk/id/eprint/513090 |
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