Fig. 6.

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Illustrations of the effects of geometry and perspective when measuring CMEs. The simple case of a symmetric circular coil, intended to represent an oversimplified flux rope, is presented in three scenarios: (a) completely flat; (b) at an incline, such as if it erupted with one end leading the other; and (c) with the center leading the flanks of the coil. In the case of white light imagery, a fictional observer would observe these configurations in their entirety, and a section at the bottom of the third coil has been highlighted in blue to demonstrate the variation of its location in each scenario. Note that the alignment referred to as “Down the Barrel” is slightly off-axis to highlight the location of the blue feature in the overall structure.

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