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
The aurora is expected to persist at mainly Background levels, limiting any clear viewing opportunities.
Southern Hemisphere
The aurora is expected to persist at mainly Background levels, limiting any clear viewing opportunities.
Issued at: 00:02 (GMT) on Mon 28 Sep 2026
Forecast overview
Space Weather Forecast Headline: No significant activity.
Analysis of Space Weather Activity over past 24 hours
Solar Activity: Low with isolated small Common-class flares. There are two sunspot regions on the disc. The westernmost one has simplified to a unipolar region, and will soon move over the limb. The other is just northwest of centre disc, and while this showed some limited development, it remains a small and simple spot.
No Earth-directed Coronal Mass Ejections (CMEs) were observed.
Solar Wind / Geomagnetic Activity: Mainly slow wind conditions were observed. Solar wind speeds eased from Slightly Elevated at around 450km/s to be Background at 350km/s down to 420km/s. Interplanetary Magnetic Field was Weak. The north-south component was Weak, and favoured a southward orientation. Geomagnetic activity was Unsettled to Active (Kp3-4) at first, but became mainly Quiet (Kp0-2) since 27/0600 UTC.
Energetic Particles / Solar Radiation: No solar radiation storms were observed with the count rate of energetic particles (high energy protons) persisting at Background.
Four-Day Space Weather Forecast Summary
Solar Activity: Solar activity is expected to be Low to Very Low.
Solar Wind / Geomagnetic Activity: There are no Earth-directed CMEs. Background slow wind conditions are most likely to persist, with only a slight chance of a weak enhancement on day 1 (28 Sep). Geomagnetic activity is expected to be predominately Quiet with isolated Unsettled intervals. If any enhancement is observed, a spell of Unsettled with isolated Active intervals is possible.
Energetic Particles / Solar Radiation: No solar radiation storms are forecast with the count rate of energetic particles (high energy protons) expected to persist at Background.
Issued at: 00:15 (GMT) on Mon 28 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: