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Week I Review

Horizontales
Long term changes to the strength of Earth’s field
Space weather storms are caused by the external s------ magnetic field
The central zone for which space weather is reported on the NRCAN website
Earth’s magnetic field is often measured in
Gravity surveys investigate what physical property
Currents in the air, in fluids and in plastic ductile materials that rise with increased temperature and then fall with cooling are known as
Uncertainty due to the fact that a set of data obtained in a geophysics survey might be representative of multiple sub surface models
Data measured in 2D which includes data along a line and data at depth are called
Geophysics uses this as opposed to direct sampling and contact of the subsurface
The angle of deflection between geographic and magnetic north
The component of the earth’s field that points downward as you move toward the north pole
Seismic surveys investigate what physical properties?
Verticales
A physical property measurement the is out of the ordinary or different from background values
Data measured along a line and plotted on a graph are called p
Presentation of data in map view makes use of these lines to delineate the target
If this were the case it might be a good time to view the (two words)
Short term daily changes to the strength of Earth’s field
The main theory that explains the origin of Earth’s magnetic field is
The polar zone forecast for today is