Affiliation
University of Exeter
Main category
Natural Sciences (Astrophysics and Astrononmy)
Abstract
I will consider some new developments in absolute measures of helicity (as opposed to measures
relative to a vacuum field). These measures are defined for arbitrary foliations of space by simply
connected surfaces (e.g. start with a set of nested spheres with spherical coordinates, then deform the
spheres). They are based on generalizations of Poloidal-Toroidal decompositions. One application lies
in measuring the helicity contained within the Northern hemisphere interior of the sun (or Southern
hemisphere).
DOI
10.18147/smn.2017/presentation:287
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