Why a Sun-Earth line Coronagraph is Best. Doug Biesecker NOAA/SWPC. Outline. Use classic Full Halo, Partial Halo, Limb morphology to determine Earth impact Need secondary observations to resolve near side - far side ambiguity X-ray flare, X-ray/EUV image, H-alpha image
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Xie et al. 2004
CME parameters calculated from analysis of SOHO images
Problem: Ellipses are “freeform” – no constraints on eccentricity vs offset
Cone ½ Angle = 83 degrees (full Angle 166 !!)
Full 3D graphics solution – can only represent ‘correct’ cones originating at the Sun
Cone ½ Angle
factor 2 difference
POS Ambiguity is the difference
between a hit and a miss
Is it possible to tell the difference
Between a Full and partial Halo?