Solar Conditions & Ham Radio Propagation

HF Band Info

	Band
	
Daytime Conditions
	
Nighttime Conditions
80m-40m
3.5 - 7.3 MHz
30m-20m
10.1 - 14.35 MHz
17m-15m
18.068 - 21.45 MHz
12m-10m
24.89 - 29.7 MHz

Solar Conditions

Sunspot Number

Derived from num of sunspots + groups. From 0 to 250, higher better

Solar Flux

Overall Solar Activity on 10.7cm. From 62.5 to 300, higher better

Geomagnetic Storm

Overall activity of Earth's magnetic field. Based on K-Index.

Solar Wind

Speed of Solar Wind in KM/s. Typically 0-1000, lower better; Contributes noise

Noise Floor

Noise Contributed by Solar Activity.

Other Solar Conditions

A-Index

Average Geomagnetic Activity

Kp-Index

Geomagnetic Field Disturbance. From 0 to 10, lower better

X-Ray

Intensity of X-Rays in Ionosphere. A, B, C, M, X Indicates Magnitude

304 Å Value

Total Solar Radiation at 30.4nm (Emitted by Ionized Helium)

Proton Flux

Density of Charged Protons in Solar Wind. Impacts E-Layer.

Electron Flux

Density of Charged Electrons in Solar Wind. Impacts E-Layer.

F2 Crit. Frequency

Highest Frequency that reflects back from F2 Layer.

Maximum Usable Frequency

Maximum Usable Frequency for Sky-Wave Propagation.

Inspiration for this site, along with XML data, is courtesy N0NBH. Thanks!
Prediction data provided by NOAA Space Weather Prediction Center
Last Updated Apr 24 2024 12:03 UTC (28m 52s ago)

Site by VE9CF. Please send me an email if something doesn't look right.

Band	Daytime Conditions	Nighttime Conditions
80m-40m
3.5 - 7.3 MHz
30m-20m
10.1 - 14.35 MHz
17m-15m
18.068 - 21.45 MHz
12m-10m
24.89 - 29.7 MHz