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- W2019917968 abstract "A simple parameterization of a three-dimensional flux rope is used to determine a typical flux-rope geometry that corresponds to observed flux-rope coronal mass ejection (CME) morphologies (average apparent angular widths) at a leading-edge height of about 5.5 R☉. The parameterized flux rope, the curved axis of which is assumed to trace out an ellipse, is described in terms of the eccentricity of the ellipse, the width (minor diameter d) of the flux rope at the apex, and the height of the apex above the solar surface 2R1. Assuming self-similar expansion, there are only two geometrical parameters to be determined: the eccentricity and the axial aspect ratio Λa ≡ 2R1/d. For each pair of geometrical parameters, an ensemble of 72 orientations is considered, with each being specified in terms of a latitude angle, a longitude angle, and a rotation about the direction of motion. The resulting ensemble of synthetic coronagraph images is used to produce statistical measures of the morphology for comparison to corresponding observational measures from St. Cyr et al. (2004). We find that a typical flux-rope CME has = 0.7 ± 0.2 and Λa = 1.1 ± 0.3." @default.
- W2019917968 created "2016-06-24" @default.
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- W2019917968 date "2006-12-01" @default.
- W2019917968 modified "2023-10-02" @default.
- W2019917968 title "Flux‐Rope Coronal Mass Ejection Geometry and Its Relation to Observed Morphology" @default.
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- W2019917968 doi "https://doi.org/10.1086/508337" @default.
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