Highlights of Solar and Geomagnetic Activity 21 - 27 June 2021
Solar activity was at very low to low levels during the period. Region 2833 (N23, L=208, class/area Hsx/160 on 21 Jun) produced a C1/Sf flare observed at 25/1403 UTC. A long-duration C3 x-ray event was observed from around the NE limb at 23/0707 UTC. This event was accompanied by a Type II radio sweep with an estimated shock velocity of 724 km/s. Regions 2835 (S18, L=053, class/area Dso/230 on 27 Jun) and 2836 (S27, L=057, class/area Cro/020 on 27 Jun) produced a few B-class events during the period. No Earth-directed CMEs were observed in available coronagraph data.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit was at moderate levels on 22 Jun and 26-27 Jun. High levels were observed on 21 Jun and 23-25 Jun. A maximum flux of 4,330 pfu was observed at 21/1435 UTC.
Geomagnetic field activity was was at mostly quiet levels with isolated unsettled periods observed early on 22 Jun, late on 24 Jun, and early on 25 Jun. Solar wind parameters were mostly unremarkable during the period.
Forecast of Solar and Geomagnetic Activity 28 June - 24 July 2021
Solar activity is expected to be at predominately very low levels during the outlook period.
No proton events are expected at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit is expected to be at high levels on 29-30 Jun and 01-06 Jul due to CH HSS influences. Normal to moderate levels are expected for the remainder of the outlook period.
Geomagnetic field activity is expected to be at unsettled to active levels on 30 Jun, 04 Jul, 09-10 Jul and 12-13 Jul due to recurrent CH HSS influence. Mostly quiet conditions are expected for the remainder of the outlook period.
Product: 27-day Space Weather Outlook Table 27DO.txt
:Issued: 2021 Jun 28 0115 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
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