Live · Updated every 15 min

Solar Conditions

Real-time solar flux, geomagnetic indices, and band propagation — built for amateur radio operators.

Live Conditions

Current solar data

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

Solar Flux (SFI)

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10.7 cm radio flux

A-Index

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Geomagnetic Ap (3-hr)

K-Index

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Planetary Kp (real-time)

X-Ray Class

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GOES satellite

Proton Flux

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GOES >10 MeV · S0

Solar Wind

— Bz (nT)

— Speed km/s

— Density p/cm³

— Bt (nT)

Blackout

R0 No blackout

All quiet — no active NOAA space weather alerts

Derived from Live Data

HF band conditions

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Simulated time: Now

−12 hnow+12 h

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.

SDO AIA 193 Å coronal plasma — **SDO AIA 193 Å** · Hot coronal plasma at ~1.5 MK. Bright regions are active areas — flare-prone loops and spots that drive X-ray bursts.

SDO HMI white-light sunspot map — **SDO HMI Continuum** · White-light sunspot map. Dark umbral regions indicate strong magnetic flux — more spots correlate directly with higher SFI.

SOHO LASCO C3 coronagraph — **SOHO LASCO C3** · Coronagraph — white disk occludes the sun. Bright expanding halos are coronal mass ejections (CMEs) that may reach Earth in 1–3 days.

**STEREO-A EUVI 195 Å** · NASA STEREO-A spacecraft views the sun from a different orbital vantage point, revealing active regions rotating toward or away from Earth.

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

NOAA SWPC

Active solar regions

Currently numbered NOAA Active Regions (AR) on the solar disk, ranked by flare potential. Magnetic classification and C/M/X flare probabilities are updated every 30 minutes.

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Source: NOAA SWPC solar_regions.json · updated every 30 min

GOES X-Ray Monitor

Recent solar flares

Solar flares detected by NOAA's GOES satellite in the last 7 days, newest first. Each flare briefly floods the sunlit hemisphere with X-rays — larger classes cause HF radio blackouts.

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Source: NOAA GOES primary xray-flares-7-day · updated every 5 min

24-Hour History

Solar trend

Solar Flux Index (SFI)

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K-Index (Kp)

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Trend Analysis

Historical solar data

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

Solar Flux Index (SFI)

Planetary K-Index — 7 days + forecast

Kp — Last 24 hours (3-hour buckets)

X-Ray Flux — 6 hours (GOES · log scale)

Planetary Kp — 3-Day History (3-hour bars)

A-Index (Ap) — Daily Geomagnetic Activity

Sunspot Number (SSN)

Solar Cycle 25 — Observed SSN vs NOAA Predicted

Ham Radio Impact

What the numbers mean for your radio

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HF Propagation

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Geomagnetic Activity

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☀️

Solar Events

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Ham Radio

Upcoming major HF contests

Major HF operating events — knowing the calendar helps you plan propagation windows and choose the right bands to maximize contacts.

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.

Learn about propagation → TavaOne Education ↗