Space Weather Forecast Headline: No significant activity.

Analysis of Space Weather Activity over past 24 hours

Solar Activity: Activity has been Low, with only two small Common-class flares observed.

There are four sunspot regions on the Earth-facing side of the Sun, with one of these now becoming visible in the southeast. This group is apparently magnetically unipolar, however the gradually improving viewing angle may yet reveal further detail. All of the current regions on the Earth-facing side were in slight decay.

A small 'disappearing filament' was observed in ground-based near-infrared imagery at 19/0230UTC. This was potentially then visible ion satellite imagery during the ensuing early hours UTC, although very faint. This Coronal Mass Ejection (CME) is tentatively due to cross the radius of the Earth's orbit later in the UTC day of 22 June, mainly missing south and east of the Sun-Earth line. An earlier disturbance in a filament further south in the southeast of the Sun does not appear to have resulted in any CME.

Solar Wind / Geomagnetic Activity: Solar wind speeds were within background for much of the period, however after 19/0900UTC, a rise was observed that may be related to the onset of CH68's fast wind, with speeds becoming slightly elevated along with an associated increase in solar wind temperature. The number of particles in the solar wind was within typical background values throughout. The associated magnetic field rose to become moderate and more erratic in character in the period, with the north-south component variable within this range.

The net result of the above solar wind measures was for mainly quiet geomagnetic activity.

Energetic Particles / Solar Radiation: No solar radiation storms were observed.

Four-Day Space Weather Forecast Summary

Solar Activity: Low activity is expected at first, with an increasing chance of rising to Moderate due to regions rotating on from the Sun's far side through the period.

Solar Wind / Geomagnetic Activity: A minor glance from a 19 June southeastern CME later in the UTC day of Monday 22 June is not expected to result in significant impacts as it passes Earth as a possible glancing blow later day 4. The sole fast wind due in the period may now be arriving to bring slightly elevated winds into the UTC weekend, but soon easing. Day 3, Sunday 21 June is therefore perhaps the most reliably favourable day geomagnetic activity-wise, although the bookending activity is not likely to be significantly impactful - below Minor Storm G1.

Energetic Particles / Solar Radiation: The current dearth of activity and suitably complex regions in prone locations mean that solar radiation storms are not expected in the forecast period.