Typical Magnetotelluric Fields
The sinusoidal curve has a period close to
20 seconds and is generated by a resonance
in the ionosphere. This gives good penetration
from 2-10 km. These signals are often generated
at sunset. The small spikes are
distant lightning strokes
![[image of electromagnetic field data]](time_series_pc3.gif)
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Typical Magnetotelluric Fields / 6 October 1996 /
unsworth@geophys.washington.edu