Solar Flux Index
125SFU · HighMeasured Nov 6, 2026, 3:00 PM ESTView solar flux index history →MCARC · Free amateur radio tools
Live HF Propagation & Space Weather
Explore current solar and geomagnetic conditions, understand what they mean for amateur radio, and compare the history behind each reading. Free to use, with no account required.MCARC Current Propagation
Current Solar & Radio Conditions
CurrentData acquired Nov 7, 2026, 12:27 PM EST · UTC 17:27
Global solar and space-weather measurements from NOAA/SWPC, with a broad MCARC-calculated amateur-radio estimate oriented to Martin County. It is not a point-to-point path prediction.
Planetary Kp
2.3index · UnsettledMeasured Nov 7, 2026, 12:22 PM ESTView planetary kp history →Solar-Wind Speed
637km/s · ElevatedMeasured Nov 7, 2026, 12:21 PM ESTView solar-wind speed history →IMF Bz
-2.0nT · SouthwardMeasured Nov 7, 2026, 12:21 PM ESTView imf bz history →GOES X-Ray
C8.58.52e-6 W/m² · Observed classMeasured Nov 7, 2026, 12:23 PM ESTView goes x-ray history →Sunspot Number
96observed · ObservedMeasured Nov 6, 2026, 7:00 PM ESTView sunspot number history →NOAA R / S / G Scales
R1 minorS0 noneG0 none
Measured Nov 7, 2026, 12:24 PM ESTPlanetary Kp
Last 6 hours · indexSolar wind
Last 6 hours · km/sIMF Bz
Last 6 hours · nTGOES X-ray
Last 6 hours · W/m² (log)Locally calculated estimate
General HF Band Outlook for Martin County
Calculated after acquisition Nov 7, 2026, 12:27 PM EST| Band | Day | Night |
|---|---|---|
| 80m | Good | Excellent |
| 40m | Excellent | Excellent |
| 30m | Excellent | Excellent |
| 20m | Excellent | Excellent |
| 17m | Good | Good |
| 15m | Fair | Poor |
| 12m | Poor | Poor |
| 10m | Poor | Poor |
How this estimate works
It starts with the existing MCARC day/night band scores, then adjusts for solar flux, Kp, and elevated solar wind with southward Bz. The current implementation applies daytime X-ray adjustments to 30m through 10m while leaving 80m and 40m unchanged; that model choice remains under club review. All available measurements were included.
Estimated from current validated solar flux, Kp, solar wind, Bz, X-ray activity, and broad day/night behavior. Actual propagation depends on location, path, season, antennas, local noise, and ionospheric conditions.
Live global geometry
World Greyline
The gold band is the moving twilight zone. Find the MCARC marker to see whether the greyline has reached Martin County.
Daylight Twilight / greyline NightUpdates every minute · Day/night geometry only, not a propagation prediction.
Measurements and R/S/G scales: NOAA Space Weather Prediction Center. The HF outlook is calculated locally by MCARC from those validated inputs.