*Waves in the Earth's magnetic field have a
frequency that is given on the y-axis.
*The color represents the amount of power in
the waves:
*Red indicates a lot of power and interesting space weather.
However, it can also indicate cars passing by the school
or other moving metal nearby the magnetometer.
*Blue very little power.
*Green-yellow is solid background noise in the magnetometer.
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Time is on the x-axis in Universal Time.
The y-axis measures the magnetic field (nanotesla).
There are three panels representing the Earth's magnetic field:
1) 1st pannel X-direction: Centered on the North-South Magnetic Line
2) 2nd pannel Y-direction: is centered perpendicular to X which is East-West
3) 3rd pannel Z-direction: is centered on perpendicular to earths surface, Up-Down
Earth's magnetic field strength is largest in the Z panel,
this means that Earth's magnetic field in the U.S. is mostly
downward. The next largest magnetic field strength is in the
X panel, indicating that Earth's magnetic field in the U.S.
points strongly northward towards Earth's magnetic pole.
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Time is on the x-axis in Universal Time. These are three panels
representing Earth's magnetic field:
1) 1st panel shows the magnetic field strength in units of nanotesla
in the H-direction: the direction horizontal to Earth's surface like the
way in which a typical compass points
2) 2nd panel shows the angle (D) from the X-direction (close to magnetic north)
where the magnetic field is pointing
3) 3rd panel shows the total magnetic field strength at this location.
Each HDB plot represents magnetic field data observed at the Jack C. Davis observatory.
Because the angle is so small in the D panel, this means that the horizontal directional
changes in Earth's magnetic field due to space weather or electrical currents nearby are very small compared with Earth's total magnetic field.
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HDB-Plot
