IVM Magnetograms

Each magnetogram is a 168 kbyte GIF image. Celestial north is at the top; east is at the left. The magnetogram is displayed as four panels:

Continuum brightness
This is in arbitrary units, but on a linear scale.
Line-of-sight component of magnetic field
Projection of magnetic field vector onto the line between the solar feature and the observer. The units are Gauss. The color changes linearly with the cube root of the field strength, to better show both strong and weak features. Thus if the top of the scale is 1000 = 10^3, the midpoint is 5^3 or 125.
Transverse component of magnetic field
Magnitude of the projection of the field vector onto the plane perpendicular to the line of sight. The units are Gauss; cube-root scaling is used here too.
Direction of transverse component
The orientation of the transverse component is indicated by the pixel color, as in the key wheel at the lower left. Note that there is a 180-degree ambiguity in the direction: the polarization data does not tell us whether the field vector points to the right or to the left.

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