:Product: Forecast Discussion
:Issued: 2026 Apr 19 1230 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 (S18W68, Hsx/alpha) remained unchanged and was
unremarkable. Region 4419 (N13W06, Eso/beta-gamma) exhibited little
change and remained mostly inactive during the period as well.

No other Earth directed CMEs were observed in coronagraph imagery. 

.Forecast...
Solar activity is likely to be low with a slight chance for M-class
(R1-R2, Minor-Moderate) flares on 19-21 Apr, primarily due to the flare
potential of Region 4419.

Energetic Particle

.24 hr Summary...
The greater than 2 MeV electron flux at geosynchronous orbit was at
moderate levels. The greater than 10 MeV proton flux was at background
levels.

.Forecast...
The greater than 2 MeV electron flux is expected to increase back to
moderate to high levels on 19-21 Apr. The greater than 10 MeV proton
flux is expected to continue at background levels on 19-21 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 2-14 nT, the Bz component fluctuated between +9/-7 nT, and
solar wind speeds varied between approximately 400-600 km/s. Phi was
mostly in a negative orientation, with isolated oscillations into a
positive position.

.Forecast...
Solar wind parameters are expected to remain enhanced on 19 Apr with
continued negative polarity CH HSS influence. The enhanced conditions
are expected to gradually taper off on 20-21 Apr as the CH HSS moves
from its geoeffective position.

Geospace

.24 hr Summary...
The geomagnetic field was predominantly at active to G1 (Minor) levels,
with an isolated period of G2 (Moderate) storming.

.Forecast...
Active to G1-G2 (Minor-Moderate) geomagnetic storm levels are expected
on 19 Apr as negative polarity CH HSS geomagnetic conditions persist. A
return to unsettled to active conditions is expected on 20-21 Apr, as
HSS effects diminish.