Solar Conditions

Live Conditions

Current solar data

Solar flux index, geomagnetic conditions, and X-ray flux — refreshed every 15 minutes from NOAA SWPC.

Derived from Live Data

HF band conditions

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Estimated from SFI and Kp · real conditions vary by path, antenna, and solar terminator

Solar Terminator

Greyline map

The greyline is the twilight boundary between day and night. The 30-minute window around it — when the ionosphere is in transition — often produces outstanding long-path propagation on 40 m and 80 m.

Equirectangular projection · terminator updates every minute · yellow dot = subsolar point · dashed lines = tropics

NASA / ESA Live Imagery

The sun right now

Live solar imagery from NASA's Solar Dynamics Observatory and the ESA/NASA SOHO spacecraft — updated every few minutes.

NASA SDO (sdo.gsfc.nasa.gov) · ESA/NASA SOHO (soho.nascom.nasa.gov) · Images delayed ~15–60 min from real-time

Trend Analysis

Historical solar data

Long-term trends in solar flux, geomagnetic activity, and sunspot cycle — updated every 15 minutes from NOAA SWPC.

Ham Radio Impact

What the numbers mean for your radio

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Education

Why does any of this matter?

Solar activity directly shapes the ionosphere — and the ionosphere controls which amateur radio bands are open and how far your contacts can reach. Once you understand the connection, you'll know exactly when to call CQ.