A geometrical model for polar plumes observed by STEREO SECCH

Beidi Peng

paper

A geometrical model for polar plumes observed by STEREO SECCH

arXiv:1205.0267

Abstract

Solar polar plumes are bright radial rays rooted at the sun's polar areas. They are widely believed to have the structure of expanding tube. A four degree polynomial function was assumed to represent the change of cross section diameter as a function of height and four unknown parameters were calculated with measured average widths of total 31 plumes at 4 heights (1.04 $R_{s}$ ,1.10 $R_{s}$ ,1.16 $R_{s}$ ,1.20 $R_{s}$ ).