Solar Conditions & Ham Radio Propagation

HF Band Info

HF band propagation conditions by time of day
Band Daytime Conditions Nighttime Conditions
80m-40m Good Good
3.5 – 7.3 MHz
30m-20m Good Good
10.1 – 14.35 MHz
17m-15m Fair Fair
18.068 – 21.45 MHz
12m-10m Poor Poor
24.89 – 29.7 MHz

Solar Conditions

Sunspot Number
56
Derived from num of sunspots + groups. From 0 to 250, higher better
Solar Flux
105
Overall Solar Activity on 10.7cm. From 62.5 to 300, higher better
Geomagnetic Storm
None
Overall activity of Earth's magnetic field. Based on K-Index.
Solar Wind
331.5
Speed of Solar Wind in KM/s. Typically 0-1000, lower better; Contributes noise
Noise Floor
S0-S1
Noise Contributed by Solar Activity.

Other Solar Conditions

A-Index
4
Average Geomagnetic Activity
Kp-Index
0
Geomagnetic Field Disturbance. From 0 to 10, lower better
X-Ray
B3.9
Intensity of X-Rays in Ionosphere. A, B, C, M, X Indicates Magnitude
304 Å Value
102.2
Total Solar Radiation at 30.4nm (Emitted by Ionized Helium)
Proton Flux
9
Density of Charged Protons in Solar Wind. Impacts E-Layer.
Electron Flux
2090
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.
K-Index (Nighttime)
No Report
Geomagnetic field disturbance overnight. From 0 to 9, lower better
Aurora Activity
2
Aurora activity level (0–100). Higher = more active aurora
Aurora Latitude
66.5°
Southernmost latitude where aurora may be visible
Magnetic Field
-1.4 nT
Interplanetary magnetic field strength. Negative Bz drives geomagnetic storms
Flux Normalization
1.99
Solar flux normalization correction factor
MUF Factor
--
Maximum Usable Frequency scaling factor

VHF & E-Skip Propagation

VHF Aurora
Band Closed
Northern Hemisphere
E-Skip 10m
Band Closed
North America
E-Skip 10m
Band Closed
Europe
E-Skip 6m
Band Closed
Europe
E-Skip 4m
Band Closed
Europe