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The Minimal Helicity of Solar Coronal Magnetic Fields

  • Authors: Anthony R. Yeates

2020 The Astrophysical Journal Letters 898 L49.

  • Provider: AAS Journals

Caption: Figure 3.

Results of the Cycle 24 PFSS extrapolations. Panels (a) and (b) show longitudinal averages of Br and ﹩{ \mathcal A }| {B}_{r}| ﹩ on ﹩r={r}_{0}﹩ as functions of time and latitude. Panels (d) and (e) show similar averages for ﹩| {B}_{r}| ﹩ and ﹩| { \mathcal A }{B}_{r}| ﹩. Panels (c) and (f) show time averages of (b) and (e), respectively, separately for the periods before and after the dipole reversal time at CR 2140 (dashed green line in the other plots). Finally, as functions of time, panel (g) shows the total unsigned fluxes ﹩\overline{{{\rm{\Phi }}}_{0}}﹩ and ﹩\overline{{{\rm{\Phi }}}_{1}}﹩, and panel (h) shows ﹩\overline{H}﹩ (for the different levels of magnetogram smoothing—the other panels show only the ﹩{b}_{0}=1\times {10}^{-4}﹩ results).

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