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=== Currents in the ionosphere and magnetosphere === Electric currents induced in the ionosphere generate magnetic fields (ionospheric dynamo region). Such a field is always generated near where the atmosphere is closest to the Sun, causing daily alterations that can deflect surface magnetic fields by as much as 1°. Typical daily variations of field strength are about 25 nT (one part in 2000), with variations over a few seconds of typically around 1 nT (one part in 50,000).<ref>{{cite journal |first1=Janez |last1=Stepišnik |title=Spectroscopy: NMR down to Earth |journal=[[Nature (journal)|Nature]] |volume=439 |pages=799–801 |year=2006|bibcode=2006Natur.439..799S |doi=10.1038/439799a |pmid=16482144 |issue=7078 |doi-access=free }}</ref>
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