| No. | Type | Alerts | Warnings | Watches |
|---|---|---|---|---|
| 1 | Geomagnetic Storm Watch |
G3:
13:00 (GMT) on Thu 4 Jun 2026 to 09:00 (GMT) on Sat 6 Jun 2026 |
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
Aurora forecasts
Northern Hemisphere
Auroral activity is expected to decline rapidly as the magnetic cloud associated with the recent Coronal Mass Ejections (CMEs) moves away and solar wind speeds gradually decrease. Thereafter, the auroral oval is expected to remain relatively quiet for the remainder of the period.
Southern Hemisphere
Auroral activity is expected to decline rapidly as the magnetic cloud associated with the recent Coronal Mass Ejections (CMEs) moves away and solar wind speeds gradually decrease. Thereafter, the auroral oval is expected to remain relatively quiet for the remainder of the period.
Issued at: 05:49 (GMT) on Sat 6 Jun 2026
Forecast overview
Space Weather Forecast Headline: Ongoing Coronal Mass Ejections influence, with further likelihood of G1-G2 Minor Storms Day 1. Likelihood of isolated Moderate class flares.
Analysis of Space Weather Activity over past 24 hours
Solar Activity: Solar activity is currently Low, with only minor Common-class flares observed. There are eight sunspot regions visible on the side of the Sun facing Earth. Most remain small and quiet, with little significant activity. The most noticeable recent changes have been in two separate active regions, located on the western hemisphere, which have grown in recent days, although both now appear to be stabilising. The region approaching the north-western limb remains the most closely watched one due to its recent history of producing flares, but it is currently relatively inactive. Overall, sunspot activity remains fairly subdued.
No Earth-directed Coronal Mass Ejections (CMEs) were observed.
Solar Wind / Geomagnetic Activity:
Solar wind conditions continue to show the effects of several recent CME arrivals and their associated magnetic fields. Solar wind speeds increased through the day, peaking at around 740 km/s before easing slightly. The magnetic field carried by the solar wind briefly strengthened as the CME arrived and has since weakened, although its orientation continues to fluctuate. As a result, geomagnetic conditions were initially Quiet to Unsettled but became increasingly disturbed during the second part of the period, with three G1 (Minor Storm) intervals and a brief G2 (Moderate Storm) interval between 05/1500 and 1800 UTC.
Energetic Particles / Solar Radiation: The count rate of energetic particles (high energy protons) remains at background with no solar radiation storms observed.
Four-Day Space Weather Forecast Summary
Solar Activity: Solar activity is forecast to remain generally Low, although isolated Moderate-class flares are possible due to the recent flare-producing history of the active region in the northwest quadrant.
Solar Wind / Geomagnetic Activity: Earth is currently under the combined influence of multiple CME arrivals and a coronal hole high-speed stream, creating a complex and highly variable geomagnetic environment.
Overall, with no further Earth-directed CMEs currently forecast and the influence of both the recent CME activity and the coronal hole high-speed stream expected to gradually diminish, solar wind speeds are likely to decrease over the coming days. While geomagnetic activity may still reach Active to G1–G2 (Minor to Moderate Storm) levels initially, supported by the currently Strong solar wind speeds, conditions are expected to ease to predominantly Quiet to Unsettled levels later on Day 1 (06 June) and remain so for most of the forecast period.
Energetic Particles / Solar Radiation: The count rate of energetic particles (high energy protons) is forecast to persist at background with no solar radiation storms occurring.
Issued at: 00:08 (GMT) on Sat 6 Jun 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: