Space Weather
Space weather describes changing environmental conditions in near-Earth space. Magnetic fields, radiation, particles and matter, which have been ejected from the Sun, can interact with the Earth’s upper atmosphere and surrounding magnetic field to produce a variety of effects.
Space weather notifications
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Aurora forecasts
Northern Hemisphere
No significant space weather is expected, with aurora sightings unlikely.
Southern Hemisphere
No significant space weather is expected, with aurora sightings unlikely.
Issued at: 00:13 (GMT) on Sat 19 Sep 2026
Forecast overview
Space Weather Forecast Headline: Increasing Chance of G1/Minor Storm activity on day 4 (22 Sep).
Analysis of Space Weather Activity over past 24 hours
Solar Activity: Solar activity has been Very Low, with only minor Background-class flaring observed. The visible disc is currently spotless.
There were no Earth directed coronal mass ejections observed during the period.
Solar Wind / Geomagnetic Activity: Solar winds indicated waning coronal hole fast winds. Solar wind speeds were Slightly Elevated and on a slow decline. The Interplanetary Magnetic Field was Weak. The north-south component varied Weakly. Geomagnetic activity was Quiet (Kp 1-2).
Energetic Particles / Solar Radiation: GOES18 >10MeV proton flux was at normal background levels.
Four-Day Space Weather Forecast Summary
Solar Activity: Solar activity is expected to remain Very Low or Low.
Solar Wind / Geomagnetic Activity: Solar winds are expected to decline to Slow-Ambient speeds into day 1 (19 Sep). The next enhancement, from CH96/+ in the southeast may arrive towards the end of the forecast period on day 4 (22 Sep), with Slightly Elevated or perhaps Elevated winds developing.
Geomagnetic activity is expected to be mainly Quiet (Kp 0-2), perhaps with isolated Unsettled (Kp 3) periods through days 1-3 (10-21 Sep). Day 4 (22 Sep) may see an increasing chance of Active to G1/Minor Storm periods developing.
Energetic Particles / Solar Radiation: No solar radiation storms are expected through the period.
Issued at: 00:12 (GMT) on Sat 19 Sep 2026
Solar imagery
SDO AIA-193
This channel highlights the outer atmosphere of the Sun - called the corona - as well as hot flare plasma. Hot active regions, solar flares, and coronal mass ejections will appear bright here. The dark areas - called coronal holes - are places where very little radiation is emitted, yet are the main source of solar wind particles.
Issued at:
SDO AIA-304
This channel is especially good at showing areas where cooler dense plumes of plasma (filaments and prominences) are located above the visible surface of the Sun. Many of these features either can't be seen or appear as dark lines in the other channels. The bright areas show places where the plasma has a high density.
Issued at: