S&P 500 vs. Geomagnetic Ap and Kp Forecasts: October 19–23, 2026

The S&P 500 vs. Geomagnetic Kp Index chart below displays hourly S&P 500 futures bars against the NOAA 3-hour equivalent Ap series, shifted forward by 45 hours and plotted on an inverted right-hand scale. The chart starts on Saturday, October 17, and ends the following Sunday, October 25.

 

 

   

The daily S&P 500 vs. the daily Ap Index chart above (shifted four calendar days; solid blue line = historical GFZ Ap file; dashed blue line = current NOAA 45-day Ap forecast) projects S&P 500 Lows for Oct 24 (Sat): Ap 22, Nov 4 (Wed): Ap 30, Nov 13 (Fri): Ap 28, Nov 22 (Sun): Ap 20, and Dec 1 (Tue): Ap 30.

 

See also:

TPR (October 12, 2026) - S&P 500 vs. Geomagnetic Ap Index and Kp Index.  

TPR (August 22, 2026) - S&P 500 vs. Ap Index: +3-Day Lag and Limits of Multi-Week Forecasting.

Larry Williams (October 1, 2026) - My Forecast for the Rest of 2026. 

Nicholas D. Savino (October 1, 2026) - S&P 500 Forecast for October 2026.