Solar Physics

, Volume 49, Issue 1, pp 177–185

The Hale solar sector boundary

Authors

  • Leif Svalgaard
    • Institute for Plasma Research, Stanford University
  • John M. Wilcox
    • Institute for Plasma Research, Stanford University
Article

DOI: 10.1007/BF00221492

Cite this article as:
Svalgaard, L. & Wilcox, J.M. Sol Phys (1976) 49: 177. doi:10.1007/BF00221492

Abstract

A Hale solar sector boundary is defined as the half (northern hemisphere or southern hemisphere) of a sector boundary in which the change of sector magnetic field polarity is the same as the change of polarity from a preceding spot to a following spot. Above a Hale sector boundary the green corona has maximum brightness, while above a non-Hale boundary the green corona has a minimum brightness. The Hale portion of a photospheric sector boundary tends to have maximum magnetic field strength, while the non-Hale portion has minimum field strength.

Copyright information

© D. Reidel Publishing Company 1976