Solar Conditions
HF Band ConditionsAs of Sat Sep 12, 2026 · 2:39 AM
Propagation conditions by band and time of day
| Band | Daytime | Nighttime |
Outlook ⓘ |
|
80m-40m
3.5 – 7.3 MHz
|
Fair |
Good |
→ Kp is holding steady. |
|
30m-20m
10.1 – 14.35 MHz
|
Good |
Good |
|
17m-15m
18.068 – 21.45 MHz
|
Fair |
Fair |
|
12m-10m
24.89 – 29.7 MHz
|
Poor |
Poor |
| → Kp is holding steady. |
Outlook derived from the NOAA SWPC Kp forecast and 27-day solar flux outlook.
Next predicted disturbance: Kp 5 (G1+) around Sep 24.
Solar Conditions
Key indices driving HF propagation right now
Solar Flux
110.0
Overall solar activity at 10.7cm. From 62.5 to 300; higher is better.
Sunspot Number
88
Derived from number of sunspots + groups. From 0 to 250; higher is better.
Geomagnetic Field
Quiet
Overall activity of Earth's magnetic field, based on the Kp index.
Solar Wind
427.0
Speed in km/s. Typically 0–1000 - lower is better; contributes to noise.
Noise Floor
S1-S2
Background noise contributed by solar activity.
Other Solar Conditions
Detailed indices for the propagation-curious
A-Index
8
Average geomagnetic activity. Lower is better.
Kp Index
2.00
Planetary geomagnetic disturbance index, 0 to 9. Lower is better.
X-Ray
B3.4
X-ray intensity in the ionosphere. A, B, C, M, X indicates magnitude.
304 Å Value
113.2
Total solar radiation at 30.4nm, emitted by ionized helium.
Proton Flux
21
Density of charged protons in the solar wind. Impacts the E-layer.
Electron Flux
2270
Density of charged electrons in the solar wind. Impacts the E-layer.
F2 Critical Freq
--
Highest frequency that reflects back from the F2 layer (MHz).
Max Usable Freq
--
Maximum usable frequency for sky-wave propagation (MHz).
Aurora Activity
3
Aurora activity level (0–100). Higher = more active aurora.
Aurora Latitude
65.6°
Southernmost latitude where aurora may be visible.
Magnetic Field
3.8 nT
Interplanetary magnetic field. Negative Bz drives geomagnetic storms.
Kp Index (Night)
No Report
Planetary geomagnetic disturbance index, overnight reading. Lower is better.
VHF & E-Skip Propagation
Sporadic-E and Auroral Openings
VHF Aurora
Band Closed
Northern Hemisphere
E-Skip 10m/6m
Band Closed
North America
E-Skip 10m/6m
Band Closed
Europe
E-Skip 6m
Band Closed
Europe
E-Skip 4m
Band Closed
Europe
3-Day Kp Forecast
NOAA SWPC prediction, 3-hour periods (UTC). Green = quiet, amber = unsettled, red = storm (G1+)
27-Day Outlook
NOAA SWPC predicted solar flux and geomagnetic activity · issued Sep 7 2026 UTC. Dots show your observed daily SFI as history accumulates.
Solar Flux — forecast vs observed
Largest Kp per day — forecast
Last 48 Hours
Hourly detail — the indices that move between daily updates
30-Day Trends
Daily averages from stored history