Space Weather
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.
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Aurora forecasts
Northern Hemisphere
Some minor geomagnetic activity may occur on Sunday 30th Nov due to ongoing fast solar winds. Aurora sightings may be possible across the far north of Scotland and similar latitudes at times where skies are clear, but are not expected. Following this, the aurora oval is expected to return to background levels.
Southern Hemisphere
Some minor geomagnetic activity may occur on Sunday 30th Nov UTC due to ongoing coronal hole fast winds. Aurora sightings may be possible across the far south of New Zealand where skies are clear, but are not expected. Following this, the aurora oval is expected to return to background levels.
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Forecast overview
Space Weather Forecast Headline: Moderate class solar flares expected, slight chance of Strong solar flares.
Analysis of Space Weather Activity over past 24 hours
Solar Activity: Solar activity during the last 24 hours has been Moderate with six Moderate solar flares, the largest peaking at 29/1607UTC from an unnumbered region around the northeast limb. There are five sunspots on the disc currently clearly visible. AR4291, located in the southwest disc, is a relatively complex region, although solar flaring from this region has been insignificant so far. A new active region, recently numbered AR4294 continues to rotate around the south-eastern limb and as such remains difficult to analyse in detail, though appears to be a large and complex region with multiple spots evident, likely with more detail still to emerge. The remaining regions are all smaller, magnetically simple and stable.
Occasional coronal mass ejection activity was observed on or around the east limb, and analysis remains ongoing. No clearly Earth-directed ejecta was observed in available imagery however.
Solar Wind / Geomagnetic Activity: Solar wind parameters showed continued influence from fast solar winds. Solar wind speeds were Elevated to Strong. The Total Interplanetary Magnetic Field, Bt, was Weak. The important north-south component, Bz, was also Weak and highly variable in direction, although generally favouring a negative (southward) orientation. Geomagnetic activity was Quiet to Active (Kp2-4).
Energetic Particles / Solar Radiation: The count rate of energetic particles (high energy protons) was at or close to Background, with no Solar Radiation Storms observed.
Four-Day Space Weather Forecast Summary
Solar Activity: Generally Moderate solar activity is forecast to continue into the period, with occasional Moderate solar flares expected. There is a Slight Chance of isolated Strong solar flares.
Solar Wind / Geomagnetic Activity: There are currently no Earth-directed coronal mass ejections (CMEs) forecast.
Geomagnetic activity is expected to be mainly Unsettled to Active (Kp3-4) initially, with a slight chance of G1/Minor Storm (Kp5) interval though Day 1 (30 Nov) as current Strong solar winds slowly decline. Geomagnetic activity should gradually trend toward Quiet (Kp1-2) with a Chance of Unsettled (Kp3) intervals from Day 2 (01 Dec) onward, although confidence reduces by the end of the period with the potential for further fast solar wind influence.
Energetic Particles / Solar Radiation: The count rate of energetic particles (high energy protons) is at, or near normal background levels and Likely to remain at similar levels during the four-day period, though with a rising Slight Chance of reaching S1/Minor Solar Radiation Storm levels.
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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.
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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.
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