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Propagation

Introduction

The National Oceanic and Atmospheric Administration Space Weather Prediction Center forecasts a solar maximum between 105 and 125, with the peak occurring between November 2024 and March 2026.  There is broad consensus that solar minimum is ongoing in 2020 — or may have already occurred — and that Cycle 25 will have no major change in the level of solar activity compared to Cycle 24.

You can get custom professional-grade high-frequency (3-30 MHz) propagation predictions online.

Where can I find solar data?

Mark Downing, WM7D, has graphs of solar data on his web site.

Understanding Monthly Propagation Charts

 

"Those New QST Propagation Charts," by Jerry Hall, K1TD

"Interpreting QST's New Propagation Charts for Low Power and Low Antennas," by Jerry Hall, K1TD

 

NOTE: Due to disruptions caused by the impact of the COVID-19 pandemic on ARRL Headquarters operations, the monthly charts will not be updated until later this year. Our apologies for the inconvenience.

May 2020

East Coast

Midwest

West Coast

Alaska Hawaii

These predictions are for a solar flux of 66.

 

April 2020

East Coast

Midwest

West Coast

Alaska Hawaii

These predictions are for a solar flux of 73.

 

March 2020

East Coast

Midwest

West Coast

Alaska Hawaii

These predictions are for a solar flux of 73.

 

February 2020

East Coast

Midwest

West Coast

Alaska Hawaii

These predictions are for a solar flux of 73.

 

January 2020

East Coast

Midwest

West Coast

Alaska Hawaii

These predictions are for a solar flux of 73.

December 2019

East Coast

Midwest

West Coast

Alaska Hawaii

These predictions are for a solar flux of 73.

 

November 2019

East Coast

Midwest

West Coast

Alaska Hawaii

These predictions are for a solar flux of 71.

 

October 2019

East Coast

Midwest

West Coast

Alaska Hawaii

These predictions are for a solar flux of 70.

 

September 2019

East Coast

Midwest

West Coast

Alaska Hawaii

These predictions are for a solar flux of 69.

August 2019

East Coast

Midwest

West Coast

Alaska Hawaii

These predictions are for a solar flux of 68.

July 2019

East Coast

Midwest

West Coast

Alaska Hawaii

These predictions are for a solar flux of 67.

June 2019

East Coast

Midwest

West Coast

Alaska Hawaii

These predictions are for a solar flux of 74.

 

May 2019

East Coast

Midwest

West Coast

Alaska Hawaii

These predictions are for a solar flux of 74.

April 2019

East Coast

Midwest

West Coast

Alaska Hawaii

These predictions are for a solar flux of 67.