Methods of measuring CME properties.
|Frequency of occurrence||Count the number of observed CMEs occurring over a given time period.|
|Distance (height)||Select an easily identifiable feature near the CME leading edge (some choose a common position angle) and measure its distance from the center of the Sun, calibrating to units of solar radii.|
|Speed (acceleration)||Measure the distances of the same feature in multiple images and plot the distance-time distribution. A linear least-squares fit provides the speed; a second-order polynomial fit provides the acceleration.|
|Geometry||Trace out the leading edge of the CME and calibrate to units of solar radii.|
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