Table 1.
Methods of measuring CME properties.
| Property | Method |
|---|---|
| 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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