Sunspots, Lunar Cycles and Weather Cycles | Louis M. Thompson

The occurrence of an 18- to 20-year cycle in weather in the U.S. Midwest is no longer controversial. The controversial issue is the cause. This article will present both sides of the issue, and will indicate why we will know more about the cause after the 1990s.

[...] The sunspot cycle has been associated with the “20-year drought cycle” in the western U.S. since about 1909, when A.E. Douglass started publishing his tree-ring studies. This scientist became so well known that he was able to establish the Laboratory for Tree Ring Research in Tuscon, Arizona, in 1938. 

 

[...] The sunspot cycle has averaged about 11 years since 1800. As the sun rotates on its axis, it makes a complete turn in about 27 days. Large and persistent spots appear to move from left to right for about two weeks, disappear, and return after about two weeks. The leading edges of spots or clusters of spots have a negative charge in one 11-year cycle and a positive charge in the next cycle. Hence, the term “double sunspot cycle.”

The conventional wisdom is that the drought cycle of about 20 years occurs near the end of the negative cycle and at the time of low solar activity. The drought periods of the 1910s, 1930s, 1950s, and 1970s occurred at the end of the negative cycle. The drought periods did not consistently follow that pattern from 1800 to 1900, although the severe droughts of the 1820s and 1840s occurred at the end of the negative cycle.

Quoted from:
Louis M. Thompson (1989) - Sunspots and Lunar Cycles: Their Possible Relation to Weather Cycles.
In: Cycles, September/October 1989, Foundation for the Study of Cycles.
 
See also:
William Stanley Jevons (1875) - Sunspots and the Price of Corn and Wheat.

Raymond H. Wheeler (1943) - The 100 Year Cycle - Climate, Regime Change and War.

 Donald A. Bradley (1950) - Cycles Write World History.

Michael G. Zahorchak (1983) - Climate, the Key to Understanding Business Cycles: With a Forecast of Trends Into the 21st Century.
Jasper Kirkby (1998) - Sunspot Cycle Length vs Temperature Anomaly.
Henrik Svensmark (2007) - The Cloud Mystery.
Tom McClellan (2012) - Sunspots - The Real Cause of Higher Grain Prices.
TPR (2016) - Inigo Owen Jones. The Weather Prophet.
Valentina V. Zharkova et al. (2017) - The Heartbeat of the Sun.

 Peter Temple (2017) - The Wheel of Time: Raymond H. Wheeler's Drought Clock.

Peter Temple (2019) - An Introduction to Climate Cycles.

S&P 500 Index vs Sunspots | Transition between Solar Cycles #24 and #25

Last weekend the small ephermal sunspot materialized in the Sun’s northern hemisphere, then, hours later, vanished again. The magnetic field of the spot was reversed, marking it a member of the next solar cycle (see data e.g. HERE). Sunspot AR2727 appeared just north of the Sun’s equator. This one still belongs to the decaying Solar Cycle #24 that peaked back in 2012-2014. But its magnetic polarity is already that of the other, still unnumbered sunspot high above it. They are opposite. 

According to Hale’s Law, this means the two sunspots belong to different solar cycles. The high latitude sunspot appears to be a harbinger of Solar Cycle #25. Solar cycles always mix together at their boundaries. Indeed, ephemeral sunspots possibly belonging to Solar Cycle #25 have already been reported on December 20, 2016, and April 8, 2018. Now November 17, 2018, can be added to the list. The slow transition between Solar Cycle #24 and Solar Cycle #25 appears to be underway.

SPX vs Solar Activity | 10.7 cm Flux | Sunspots | Ap Index

SPX vs Solar Activity | Sunspots + 10.7 cm Flux | Forecast for March 2017

Mar 01 (Wed) and Mar 05 (Sun) are the upcoming SoLunar Turn Days (HERE);
Mar 05 (Sun) and Mar 07 (Tue) the upcoming Cosmic Cluster Days (HERE)

SPX vs Solar Activity | Sunspots + 10.7 cm Flux | Forecast for February 2017

Jan 31 (Tue) is a SoLunar Turn Day (HERE)

SPX vs Solar Activity | Sunspots | 10.7 cm Flux

SPX vs Sunspots

SPX vs Solar Activity | 10.7 cm Flux | Sunspots | Ap Index

SPX vs Solar Activity | Sunspots | 10.7 cm Flux | Ap Index

Raj Times and Cycles forecasted the next short term Low for October 10 (Mon) +/-1 TD (HERE)

The Presidential, Decennial, and Annual Cycles all point to a low in US-stocks on Monday, October 10 (HERE).

SPX vs Sunspots | 36 - 48 Hour Forecast

Current Solar Data from NOAA (HERE + HERE)

The number  of sunspots in existence at any one time is continually subject to change as some disappear and new ones emerge. As the sun
rotates on its own axis, these sunspots are visible at 27-day intervals, the approximate period required for the sun to make one complete
rotation. The 27-day sunspot cycle causes variations in the ionization density of the layers on a day-to-day basis.