The Sun’s Magnetic (Hale) Cycle and 27 Day Recurrences in the aa Geomagnetic Index

We construct a new solar cycle phase clock which maps each of the last 18 cycles onto single normalized epoch for approximately 22 year Hale (magnetic polarity) cycle, using Hilbert transform daily sunspot numbers (SSN) since 1818. The occurrences maxima show almost no dependence, confirming that is synchronized to polarity reversals. odd minima lead even by ~ 1.1 years, whereas terminators (McIntosh et al. (2019)) lag 2.3 years. mimimum-terminator interval thus relatively extended and shortened ones. re-engineer Sargent(1985,2021) R27 index combine it with our analysis obtain high time resolution parameter 27 day recurrence in aa, . This reveals transition recurrence, is, an ordered wind dominated speed streams, fast, occurring within 2-3 rotations or less. It resolves late declining twice as long on Schwabe odd. Galactic Cosmic Ray flux rises step but then stays high. Our also identifies slow timescale trend SSN simply tracks Gleissberg cycle. find this modulus latitudes, antiphase index.