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==== 4. Viewing geometry makes Europe look worse even when aurora exists ==== Even when aurora is technically present over Ireland: * It is usually lower on the horizon * Emission height (~100–120 km) + curvature means: - Canada sees aurora higher in elevation - Ireland sees it flatter and weaker Your photo vs visual rings are correctly capturing this: * Canada intersects the oval at better elevation angles * Ireland intersects it at marginal or sub-visual angles Hence: : “Metrics look equal, but Europe gets nothing” That’s expected.
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