Message:21568 In: SPACWX.USA
From: N4SDDate: Tue, 28 Apr 26 12:32:00 Z
Newsgroups: SPACWX.USA
Subject: Space Weather Forecast Discussion
Message-ID: <12142_N4SD>
Path: N2MH4|N3MEL|KA3VSP|N4SD
R:260428/1412Z 30689@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260428/1411Z 16405@N3MEL.#EPA.PA.USA.NOAM LinBPQ6.0.25
R:260428/1404Z 1349@KA3VSP.DE.USA.NOAM BPQ6.0.25
R:260428/1232Z 12142@N4SD.#TIDE.VA.USA.NOAM BPQ6.0.24
FXXX12 KWNP 281231
DAYDIS
:Product: Forecast Discussion
:Issued: 2026 Apr 28 1230 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
# http://www.swpc.noaa.gov/wwire.html
#
# Forecast Discussion
#
Solar Activity
.24 hr Summary...
Solar activity was at low levels. Region. Both Regions 4420
(N16W36, Fkc/beta-gamma-delta) and 4425 (N05E29, Ekc/beta-gamma-delta)
produced the majority of the C-class flares. Slight decay was observed
in the intermediate spots of Region 4420 while maintaining a weak delta
magnetic configuration. Moderate growth and consolidation occurred in
Region 4425. Slight growth was observed in Region 4424 (N16W01,
Dso/beta).
No Earth-directed CMEs were observed in coronagraph imagery.
.Forecast...
Solar activity is expected to be at low levels, with a high likelihood
to reach moderate levels (R1/R2, Minor/Moderate), and a chance for
X-class (R3/Strong or greater) events through 30 Apr, due primarily to
the complexity of Regions 4420 and 4425.
Energetic Particle
.24 hr Summary...
The greater than 2 MeV electron flux at geosynchronous orbit was at low
to moderate levels. The greater than 10 MeV proton flux at
geosynchronous orbit was at background levels.
.Forecast...
The greater than 2 MeV electron flux is anticipated to reach moderate to
high levels on 30 Apr due to CH HSS influence. There is a slight chance
the greater than 10 MeV proton flux could reach S1 (Minor) levels on
28-30 Apr due to the flare potential of Regions 4420 and 4425.
Solar Wind
.24 hr Summary...
Solar wind parameters were near nominal levels with solar wind speed
decreasing from ~450-360 km/s. Total field ranged from 2-6 nT while the
Bz component was between +5/-3 nT. Phi angle was mostly positive.
.Forecast...
Solar wind parameters are expected to be at or near nominal levels
through midday on 29 Apr. An increase in activity is expected by mid to
late on 29 Apr with the onset of a negative polarity CH HSS. HSS
conditions are expected to persist through 30 Apr. Solar wind speeds in
the 450-550 km/s range are likely.
Geospace
.24 hr Summary...
The geomagnetic field was at quiet levels.
.Forecast...
The geomagnetic field is expected to be mostly quiet on 28 Apr. An
increase to unsettled to active levels is expected on 29-30 Apr with the
onset of a negative polarity CH HSS.
------
73 de Sperry N4SD
N4SD@N4SD.#TIDE.VA.USA.NOAM
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