:Product: Weekly Highlights and Forecasts
:Issued: 2021 Apr 19 0151 UTC
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# Weekly Highlights and Forecasts
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Highlights of Solar and Geomagnetic Activity
12 - 18 April 2021

Solar activity was very low throughout the period with B-class flare
activity observed from Rgn 2814 (S22, L=008, class/area Cro/090 on
14 Apr), Rgn 2815 (S21, L=344, class/area Bxo/010 on 16 Apr) and Rgn
2816 (S24, L=264, class/area Cao/080 on 16 Apr). The largest event
of the period was a B9 x-ray event observed at 17/1717 UTC from a
region beyond the ESE limb. Associated with this event was a Type II
radio signature with an estimated shock velocity of 382 km/s and a
slow-moving, non-Earth directed CME off the E limb.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at
moderate levels on 12-16 Apr. High levels were observed on 17-18 Apr
with a maximum flux reading of 14,078 pfu at 18/1905 UTC.

Geomagnetic field activity was at mostly quiet levels on 12-14 Apr
with an isolated active period observed late on the 14th. Unsettled
to G1 (minor) geomagnetic storm levels were reached early on 15 Apr
due to possible effects from the 10 Apr CME. Mostly unsettled to
active levels were observed on 16-18 Apr, with G1 (Minor) storn
levels observed on 16 and 17 Apr. This activity was all due to
recurrent, negative polarity CH HSS influence. During this activity,
wind speeds reached 600 km/s, total field reached maximums of 13 nT
and the Bz component reached -10 nT at times.

Forecast of Solar and Geomagnetic Activity
19 April - 15 May 2021

Solar activity is expected to be at 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 reach high levels on 19-24 Apr and 13-15 May due to high
speed solar winds. Normal to moderate levels are anticipated for
25-30 Apr and 01-12 May.

Geomagnetic field activity is expected to be at unsettled to active
levels on 19-20 Apr, 23-24 Apr, 27-28 Apr, 04 May, 08 May and 11-15
May, with G1 (Minor) geomagnetic storm levels likely on 13-14 May.
This activity is all due to recurrent CH HSS influence. Mostly quiet
levels are expected for the remainder of the outlook period.