@@ -13,9 +13,14 @@ Historically, the most common coordinate system used to specify measured geomagn
1. H is the magnitude of the geomagnetic field vector tangential to the Earth’s surface;
2. D is the declination, or clockwise angle from the vector pointing to the geographic north pole to the H vector;
3. Z is the downward component of the geomagnetic field.
<dl>
<dt>H</dt>
<dd>is the magnitude of the geomagnetic field vector tangential to the Earth’s surface;</dd>
<dt>D</dt>
<dd> is the declination, or clockwise angle from the vector pointing to the geographic north pole to the H vector;</dd>
<dt>Z</dt>
<dd>is the downward component of the geomagnetic field.</dd>
</dl>
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@@ -73,11 +78,11 @@ One thing that is not labeled in this figure is the angle d (see Eq. 4), which i
Equations 4, 5, and 6 describe how to convert the horizontal components of a USGS magnetometer’s raw data element into more standard H and D components.
