Long Period Magnetotelluric Fields
These are long-period data collected in Tibet in 1995.
(The signals were very weak). Note the daily variation
produced as the earth rotates within the solar wind.
At day 12 a sharp step in Bx (north-south manetic field)
occurs. This was generated by a sun-spot.
The low frequency content of this step gave resolution
to a depth of several hundred kilometres.
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Long Period Magnetotelluric Fields / 6 October 1996 /
unsworth@geophys.washington.edu