Solar Wind Today: Live Solar Wind Forecast (August 2026)
Up-to-date solar wind speed and density readings — data from NOAA, NASA, and other official space weather sources. Live solar wind forecast, updated in real time.
What Is the Solar Wind
The solar wind is a continuous stream of charged particles — mostly electrons and protons — flowing outward from the Sun's outer atmosphere (the corona) at high speed. Unlike a solar flare or a CME, which are discrete events, the solar wind never stops: it fills the entire solar system and is what shapes the heliosphere, the vast magnetic bubble the Sun carves out of interstellar space.
The solar wind carries the Sun's magnetic field with it, stretched into a spiral shape by the Sun's rotation (the Parker spiral). When this embedded magnetic field points southward as it reaches Earth, it can connect efficiently with our planet's own magnetic field — a key factor in whether incoming solar wind triggers a geomagnetic disturbance or passes by with little effect.
Where the Solar Wind Comes From
The solar wind isn't uniform — its speed depends on where on the Sun it originated:
Slow solar wind (roughly 300–500 km/s) streams from the Sun's equatorial streamer belt, a region of closed magnetic loops near the solar equator.
Fast solar wind (roughly 500–800 km/s, sometimes higher) escapes through coronal holes — regions where the Sun's magnetic field lines open directly into space, letting particles stream out largely unobstructed.
Because the Sun rotates roughly every 27 days, a coronal hole facing Earth tends to send a fast wind stream our way, then rotate out of view, then rotate back — producing a recurring, roughly monthly pattern of elevated solar wind speed that's distinct from the more random timing of flares and CMEs.
Solar Wind Classification and Key Indicators
There's no official G-scale for the solar wind itself (that scale describes the geomagnetic storm it can cause). Instead, forecasters track a handful of measured parameters directly:
Speed — typically 300–500 km/s for slow wind, 500–800+ km/s for fast streams from coronal holes.
Density — the number of particles per cubic centimeter reaching Earth; low but fast wind can still be geoeffective.
Interplanetary magnetic field (IMF) orientation, especially the Bz component — a sustained southward Bz is the single strongest predictor of whether solar wind will couple with Earth's magnetosphere and drive a storm.
Sustained high-speed streams from coronal holes are typically associated with moderate (G1–G2), recurrent geomagnetic storms, while the fastest, densest solar wind — usually driven by a CME rather than a coronal hole — is behind the strongest (G3 and above) storms.
Solar Wind and Solar Cycle 25
Fast solar wind streams from coronal holes don't peak alongside sunspots and flares — they're typically most frequent during the declining phase of the solar cycle, as large, stable coronal holes become more common. As Solar Cycle 25 moves past its maximum, coronal-hole-driven fast wind streams — and the recurrent, moderate geomagnetic activity they bring — are expected to become a larger share of overall space weather activity, even as flare and CME frequency gradually decreases.
Established Effects of the Solar Wind on Earth
Geomagnetic storms. High-speed streams and, especially, CME-driven solar wind are the direct trigger for geomagnetic storms of all strengths.
Auroras. Energy from the solar wind, funneled along magnetic field lines toward the poles, is what powers the aurora borealis and aurora australis.
Satellites and the ISS. Sustained fast solar wind can heat and expand the upper atmosphere, increasing drag on low-orbit satellites.
Radio communication and GPS. During the geomagnetic disturbances solar wind triggers, shortwave radio and satellite navigation accuracy can be affected.
Power grids. The geomagnetically induced currents from solar-wind-driven storms place extra stress on transformers and power lines.
Possible Effects of Solar Wind–Driven Activity on Health and Wellbeing
Starting with the work of A.L. Chizhevsky in the 1930s (heliobiology), a large body of observations has accumulated: a number of statistical studies find a link between geomagnetic activity levels — including the recurrent, moderate storms driven by high-speed solar wind streams — and the frequency of heart attacks, blood pressure spikes, sleep disturbances, and changes in wellbeing among weather-sensitive people. Proposed mechanisms include effects on melatonin and cortisol production, blood viscosity, and cryptochrome proteins that are sensitive to magnetic fields.
That's why we describe this as a possible effect: if you notice your wellbeing changing on days of elevated solar wind speed or geomagnetic activity, tracking that alongside the forecast is reasonable and safe. But this is an observation of correlation, not a diagnosis or medical advice.
Scientific Publications
Zenchenko & Breus (2021). The Possible Effect of Space Weather Factors on Various Physiological Systems of the Human Organism. Atmosphere, 12(3), 346 — https://www.mdpi.com/2073-4433/12/3/346
Papadema, Tzanis et al. (2021). Human Physiological Parameters Related to Solar and Geomagnetic Disturbances: Data from Different Geographic Regions. Atmosphere, 12(12), 1613 — https://www.mdpi.com/2073-4433/12/12/1613
The role of solar and geomagnetic activity in endothelial activation and inflammation in the NAS cohort — https://pubmed.ncbi.nlm.nih.gov/35881632/
Exploring the relationship between geomagnetic activity and human heart rate variability — https://pubmed.ncbi.nlm.nih.gov/32306151/
Long-Term Study of Heart Rate Variability Responses to Changes in the Solar and Geomagnetic Environment — https://pubmed.ncbi.nlm.nih.gov/29422633/
Live Solar Wind Forecast
Track solar wind speed, density, and IMF orientation for today and the days ahead — data is updated based on NOAA and NASA observations
What is the solar wind, in simple terms?
It's a constant stream of particles flowing out from the Sun in every direction, at speeds typically between 300 and 800 kilometers per second — unlike a flare, it never stops.
Is the solar wind the same thing as a solar flare?
No. A solar flare is a sudden burst of radiation that reaches Earth in 8 minutes. The solar wind is a continuous particle stream that takes roughly 1–4 days to reach Earth and is present at some level at all times.
Does the solar wind cause the aurora?
Yes — the aurora is powered by solar wind energy channeled along Earth's magnetic field lines toward the poles; stronger, faster solar wind (especially with a southward-pointing magnetic field) produces brighter, more widespread displays.
How fast is the solar wind right now?
Check the live tracker above — speeds around 300–400 km/s are typical of slow, quiet solar wind, while sustained readings above 500–600 km/s usually indicate a high-speed stream from a coronal hole.
Where does MeteoAgent's data come from?
Aggregated from NOAA SWPC, NASA, and other official space weather monitoring sources in real time.
