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Solar Wind Speed & HF Radio Conditions

Solar wind speed shows how quickly charged particles are moving toward Earth's neighborhood. Read the recent trend in kilometers per second alongside magnetic-field direction and Kp.

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NOAA observed readings

Solar-Wind Speed

Latest graphed reading: 637.4 km/s on Nov 7, 2026, 12:15 PM EST.

637.4 km/s on Nov 7, 12:15 PM EST

340417.5495572.5650Nov 6, 12 PMNov 7, 12 PM
NOAA reading 1-hour average
View readings as a table
Date and time (Eastern)Solar-Wind Speed
Nov 7, 12:15 PM EST637.4 km/s
Nov 7, 12:00 PM EST626.1 km/s
Nov 7, 11:45 AM EST613.7 km/s
Nov 7, 11:30 AM EST599.5 km/s
Nov 7, 11:15 AM EST590.1 km/s
Nov 7, 11:00 AM EST568.5 km/s
Nov 7, 10:45 AM EST561.5 km/s
Nov 7, 10:30 AM EST546.8 km/s
Nov 7, 10:15 AM EST573.6 km/s
Nov 7, 10:00 AM EST558.5 km/s
Nov 7, 9:45 AM EST553.6 km/s
Nov 7, 9:30 AM EST568.1 km/s
Nov 7, 9:15 AM EST555 km/s
Nov 7, 9:00 AM EST552.3 km/s
Nov 7, 8:45 AM EST513.6 km/s
Nov 7, 8:30 AM EST515.3 km/s
Nov 7, 8:15 AM EST537.6 km/s
Nov 7, 8:00 AM EST510.8 km/s
Nov 7, 7:45 AM EST493.7 km/s
Nov 7, 7:30 AM EST526.2 km/s
Nov 7, 7:15 AM EST520.8 km/s
Nov 7, 7:00 AM EST498.6 km/s
Nov 7, 6:45 AM EST500.9 km/s
Nov 7, 6:30 AM EST483.3 km/s
Nov 7, 6:15 AM EST501.5 km/s
Nov 7, 6:00 AM EST506.7 km/s
Nov 7, 5:45 AM EST498.7 km/s
Nov 7, 5:30 AM EST476.3 km/s
Nov 7, 5:15 AM EST480.2 km/s
Nov 7, 5:00 AM EST507.5 km/s
Nov 7, 4:45 AM EST491.8 km/s
Nov 7, 4:30 AM EST497.2 km/s
Nov 7, 4:15 AM EST499.3 km/s
Nov 7, 4:00 AM EST471.4 km/s
Nov 7, 3:45 AM EST462 km/s
Nov 7, 3:30 AM EST473.8 km/s
Nov 7, 3:15 AM EST478.6 km/s
Nov 7, 3:00 AM EST465.7 km/s
Nov 7, 2:45 AM EST457.5 km/s
Nov 7, 2:30 AM EST463 km/s
Nov 7, 2:15 AM EST444.2 km/s
Nov 7, 2:00 AM EST447.5 km/s
Nov 7, 1:45 AM EST439.5 km/s
Nov 7, 1:30 AM EST450.6 km/s
Nov 7, 1:15 AM EST455.9 km/s
Nov 7, 1:00 AM EST436 km/s
Nov 7, 12:45 AM EST409.5 km/s
Nov 7, 12:30 AM EST408.4 km/s
Nov 7, 12:15 AM EST427.3 km/s
Nov 7, 12:00 AM EST437.4 km/s
Nov 6, 11:45 PM EST430.6 km/s
Nov 6, 11:30 PM EST435.5 km/s
Nov 6, 11:15 PM EST440.1 km/s
Nov 6, 11:00 PM EST441.8 km/s
Nov 6, 10:45 PM EST434.1 km/s
Nov 6, 10:30 PM EST436.5 km/s
Nov 6, 10:15 PM EST433.4 km/s
Nov 6, 10:00 PM EST445.5 km/s
Nov 6, 9:45 PM EST446.7 km/s
Nov 6, 9:30 PM EST448.4 km/s
Nov 6, 9:15 PM EST449.2 km/s
Nov 6, 9:00 PM EST441.6 km/s
Nov 6, 8:45 PM EST429.7 km/s
Nov 6, 8:30 PM EST436.1 km/s
Nov 6, 8:15 PM EST423.6 km/s
Nov 6, 8:00 PM EST427.2 km/s
Nov 6, 7:45 PM EST434.1 km/s
Nov 6, 7:30 PM EST447.7 km/s
Nov 6, 7:15 PM EST439.3 km/s
Nov 6, 7:00 PM EST403.3 km/s
Nov 6, 6:45 PM EST407.8 km/s
Nov 6, 6:30 PM EST407.2 km/s
Nov 6, 6:15 PM EST402.1 km/s
Nov 6, 6:00 PM EST400.6 km/s
Nov 6, 5:45 PM EST418.8 km/s
Nov 6, 5:30 PM EST421.7 km/s
Nov 6, 5:15 PM EST407.2 km/s
Nov 6, 5:00 PM EST382 km/s
Nov 6, 4:45 PM EST384 km/s
Nov 6, 4:30 PM EST383.3 km/s
Nov 6, 4:15 PM EST386.3 km/s
Nov 6, 4:00 PM EST383 km/s
Nov 6, 3:45 PM EST384.7 km/s
Nov 6, 3:30 PM EST389.7 km/s
Nov 6, 3:15 PM EST396.7 km/s
Nov 6, 3:00 PM EST413.5 km/s
Nov 6, 2:45 PM EST406.8 km/s
Nov 6, 2:30 PM EST409.4 km/s
Nov 6, 2:15 PM EST410.8 km/s
Nov 6, 2:00 PM EST381.5 km/s
Nov 6, 1:45 PM EST371.3 km/s
Nov 6, 1:30 PM EST364.9 km/s
Nov 6, 1:15 PM EST375.4 km/s
Nov 6, 1:00 PM EST369.5 km/s
Nov 6, 12:45 PM EST357.5 km/s

Readings: NOAA real-time solar wind product. Times are shown in Eastern time. The graph keeps the latest reading in each 15-minute period. Missing measurements are left blank, not treated as zero. The optional 1-hour average is calculated here from consecutive readings.

What does this number mean?

Solar wind is a stream of charged particles flowing from the Sun. This graph shows its measured speed in kilometers per second near the spacecraft monitoring conditions upstream of Earth.

Why does it matter for HF?

Faster wind can contribute to geomagnetic activity, especially when the magnetic field points south. Speed alone does not tell you whether HF conditions will improve or worsen.

How should I use the graph?

Look for a sustained speed change, then compare it with Bz and Kp. A short spike or a gap in the measurements is not enough to predict your next contact.

Learn more from NOAA Space Weather Prediction Center and ARRL's HF propagation guide.

Build a clearer picture

Explore solar & geomagnetic conditions

Each measurement tells part of the story. Compare solar activity with geomagnetic conditions, daylight and your operating path.

Live HF Propagation & Space Weather

Check current HF radio conditions with NOAA solar flux, Kp, solar wind, Bz, X-ray and sunspot data, history charts, band guidance and a live greyline map.

Explore current conditions →

Solar Flux Index (SFI) & F10.7 History

Track NOAA's Solar Flux Index with 7, 14 and 30-day F10.7 charts, daily readings and a 7-day average. Learn what solar flux means for HF propagation.

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Planetary Kp Index & Geomagnetic Activity

Explore NOAA planetary Kp index history over 1, 3 or 7 days. Compare three-hour geomagnetic readings and learn how disturbed conditions can affect HF radio.

Explore the readings →

IMF Bz & the Solar Wind Magnetic Field

View NOAA IMF Bz history over 6, 12 or 24 hours. Understand positive and negative nanotesla readings and why sustained southward Bz matters for geomagnetic activity.

Explore the readings →

GOES X-Ray Flux & Solar Flare History

Explore NOAA GOES X-ray flux and solar flare history over 1, 3 or 7 days. Understand A, B, C, M and X classes and their relevance to sunlit-side HF radio blackouts.

Explore the readings →

Sunspot Number History & HF Propagation

Explore daily NOAA sunspot numbers over 30 days, 90 days or one year with an optional 30-day average. Learn how solar activity relates to HF radio propagation.

Explore the readings →