| 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 |
||
| 1 | Kp Alert |
G2:
15:00 (GMT) on Fri 5 Jun 2026 to 18:00 (GMT) on Fri 5 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
The arrival of a Coronal Mass Ejection early on 05 Jun has resulted in gradually building geomagnetic activity, which could allow for some visible aurora across northernmost geomagnetic latitudes, although viewings are likely to be limited by the light levels. Any further arrivals, which are low confidence, could allow for some viewings further south, potentially as far south as northern England. Activity is expected to ease towards Background later on 06 Jun.
Southern Hemisphere
The arrival of a CME early on 05 Jun has resulted in gradually building geomagnetic activity, which could allow for some visible aurora across southernmost geomagnetic latitudes. Any further arrivals, which are low confidence, could allow for some viewings further north, potentially as far north as southern New Zealand and Tasmania. Activity is expected to ease towards Background later on 06 Jun.
Issued at: 14:37 (GMT) on Fri 5 Jun 2026
Forecast overview
Space Weather Forecast Headline: Ongoing Coronal Mass Ejections influence and further potential arrivals continue to give a likelihood of G1-G2 Minor Storms day 1-2. Likelihood of isolated Moderate class flares.
Analysis of Space Weather Activity over past 24 hours
Solar Activity: Low with only Common-class flares observed. There are nine sunspot regions on the disc, with the main growth observed in a region in the southwest and also in a re-emerged region in the northwest, although these remain magnetically simple. Also in the northwest, the previous active region continues with its non-typical magnetic orientation, with a number of smaller spots around the main positive polarity spot. The other regions, mostly in the east disc, remain simpler.
No Earth-directed Coronal Mass Ejections (CMEs) were observed.
Solar Wind / Geomagnetic Activity: CME arrival was observed 05/0424 UTC, from the first of the anticipated CMEs originating from 03 Jun. Solar wind speeds were Slightly Elevated at first, near 400km/s, before rising with the CME to be Elevated at 540km/s. Winds then varied Slightly Elevated to Elevated, between 440-550km/s. Interplanetary Magnetic Field (IMF) was initially Weak but rose to be Strong with the CME arrival. The north-south component rose from initially Weak values, to peak Moderately northward with the CME, before rotating to be Moderate southward from 05/1000 UTC. Despite the CME arrival, the northward IMF has resulted in only Quiet to Unsettled geomagnetic conditions (Kp0-3).
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 expected to be Low to Moderate, with a continued likelihood of isolated Moderate solar flares. There is a slight chance of an isolated Strong solar flare, this most likely from the untypically orientated sunspot in the northwest that was active a couple of days ago.
Solar Wind / Geomagnetic Activity: The first CME arrival of the three potential arrivals that originated from 03 Jun has now occurred. While this arrival was weaker than anticipated, ongoing CME influence and any connection to the fast wind of a coronal hole is likely to give further enhancement through day 1 and potentially into day 2 (05-06 Jun). Activity is then then ease later day 2 or day 3 onward (07 Jun). Geomagnetic activity is expected to increase to be Active to G1 Minor Storm on day 1 (05 Jun), with a chance of G2 Moderate Storms, and an isolated G3 Strong storm remains a slight chance. Late day 2 and into day 3 activity is expected to become mainly Quiet with isolated Unsettled intervals.
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: 12:29 (GMT) on Fri 5 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: