title: Solar Conditions and Ham Radio Propagation
source: https://solar.w5mmw.net/
author:
- "[[Matt Manjos]]"
- "[[W5MMW <matt@w5mmw.net>]]"
published:
created: 2025-06-29
description: Solar Conditions for Amateur Radio
tags:
- HamRadioSolar Conditions and Ham Radio Propagation
HF Band Info Demo
| Band | Daytime Conditions | Nighttime Conditions |
|---|---|---|
| 80m-40m | Fair | 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 | Fair | Poor |
| 24.89 - 29.7 MHz |
Solar Conditions
Sunspot Number
131
Derived from num of sunspots + groups. From 0 to 250, higher better
Solar Flux
122
Overall Solar Activity on 10.7cm. From 62.5 to 300, higher better
Geomagnetic Storm
Very Quiet
Overall activity of Earth's magnetic field. Based on K-Index.
Solar Wind
465.5
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
9
Average Geomagnetic Activity
Kp-Index
1
Geomagnetic Field Disturbance. From 0 to 10, lower better
X-Ray
B7.5
Intensity of X-Rays in Ionosphere. A, B, C, M, X Indicates Magnitude
304 Å Value
130.9
Total Solar Radiation at 30.4nm (Emitted by Ionized Helium)
Proton Flux
34
Density of Charged Protons in Solar Wind. Impacts E-Layer.
Electron Flux
1740
Density of Charged Electrons in Solar Wind. Impacts E-Layer.
F2 Crit. Frequency
MHz
Highest Frequency that reflects back from F2 Layer.
Maximum Usable Frequency
No Report
Maximum Usable Frequency for Sky-Wave Propagation.