:Product: Forecast Discussion
:Issued: 2026 Apr 20 0030 UTC
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
#
Solar Activity

.24 hr Summary...
Solar activity was at very low levels with only B-level enhancements
observed. Region 4415 (S18W74, Hsx/alpha) remained unchanged and was
unremarkable. Region 4419 (N14W12, Eao/beta-gamma) exhibited little
change and remained mostly inactive during the period as well. B-class
flare events were recorded during the period related to some filament
eruption activity near the equator in the east.

No other Earth directed CMEs were observed in coronagraph imagery. 

.Forecast...
Theres a chance for solar activity to be at low levels on 20-22 Apr,
primarily due to the flare potential from Region 4419.

Energetic Particle

.24 hr Summary...
The greater than 2 MeV electron flux at geosynchronous orbit reached
high levels at 19/1920 UTC with a maximum reading of 1,187 sfu at
19/1925 UTC. The greater than 10 MeV proton flux was at background
levels.

.Forecast...
The greater than 2 MeV electron flux is expected to be at moderate to
high levels on 20-22 Apr. The greater than 10 MeV proton flux is
expected to continue at background levels on 20-22 Apr.

Solar Wind

.24 hr Summary...
Solar wind parameters were enhanced throughout the period as CH HSS
influence continued to dominate the solar wind environment. Total field
ranged from 3-12 nT, the Bz component fluctuated between +9/-7 nT and
solar wind speeds varied between approximately 440-570 km/s. Phi was
mostly in a negative orientation, with isolated oscillations into a
positive position.

.Forecast...
Enhanced solar wind conditions are expected to gradually taper off on
20-21 Apr as the CH HSS moves from its geoeffective position. A return
to mostly nominal conditions are expected by 22 Apr.

Geospace

.24 hr Summary...
The geomagnetic field was predominantly at unsettled to active levels
with an isolated G1 (Minor) and G2 (Moderate) storm level.

.Forecast...
A return to unsettled to active conditions is expected on 20-21 Apr, as
HSS effects diminish. Quiet to unsettled levels are expected on 22 Apr.