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[email protected] and telling us what having access to this work means to you and why it’s important to you. Thank you. Solar Physics DOI: 10.1007/•••••-•••-•••-••••-• Deciphering Solar Magnetic Activity. II. The Solar Cycle Clock and the Onset of Solar Minimum Conditions Robert J. Leamon 1,2 · Scott W. McIntosh 3 · Sandra C. Chapman 4 · Nicholas W. Watkins 4,5,6 · Subhamoy Chatterjee 7 · Alan M. Title8 © Springer •••• Abstract The Sun's variability is controlled by the progression and interaction of the magnetized systems that form the 22-year magnetic activity cycle (the \Hale Cycle") as they march from their origin at ∼55◦ latitude to the equator, over ∼19 years. We will discuss the end point of that progression, dubbed \ter- minator" events, and our means of diagnosing them. Based on the terminations of Hale Magnetic Cycles, we construct a new solar activity `clock' which maps all solar magnetic activity onto a single normalized epoch. The Terminators appear at phase 0 ∗ 2π on this clock (by definition), then solar polar field reversals B R.J. Leamon
[email protected] 1 University of Maryland{Baltimore County, Goddard Planetary Heliophysics Institute, Baltimore, MD 21250, USA 2 NASA Goddard Space Flight Center, Code 672, Greenbelt, MD 20771, USA.