:Product: Forecast Discussion
:Issued: 2026 Jun 20 1230 UTC
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
#
Solar Activity

.24 hr Summary...
Solar activity reached moderate levels when Region 4472 (S14E61,
Cao/beta) produced an M1.3 flare (R1-Minor) at 20/0151 UTC; the
strongest of the period. Region 4470 (N08E21, Dao/beta) exhibited minor
growth this period and produced a C1.4 flare at 20/0307 UTC that was
accompanied by a Type-II radio sweep (~300 km/s). The remaining regions
were either stable or in decay. New spots were observed rotating into
view on the E limb near S08, but these remain unnumbered pending
additional observational data.

A CME associated with the M1.3 flare at 20/0151 UTC, and first visible
in LASCO C2 imagery off the E at 20/0212 UTC, is expected to miss Earth.
Another CME, first visible in C2 imagery at 20/0312 UTC, was associated
with activity on the far side and is not Earth-directed.

.Forecast...
Solar activity is expected to continue at low levels on 20-22 Jun, with
a slight chance for M-class (R1-Minor) flares.

Energetic Particle

.24 hr Summary...
The greater than 2 MeV electron flux reached moderate levels. The
greater than 10 MeV proton flux remained at background values.

.Forecast...
The greater than 2 MeV electron flux is expected to reach moderate
levels over 20-22 Jun. The greater than 10 MeV proton flux is expected
to remain at background levels through 22 Jun.

Solar Wind

.24 hr Summary...
Solar wind parameters remained mildly enhanced under positive polarity
CH HSS influences. Total magnetic field strength reached 10 nT, and the
Bz component was observed as far south as -7 nT. Solar wind speeds
ranged between ~360-460 km/s. Phi angle was primarily oriented in a
positive solar sector.

.Forecast...
Solar wind parameters are expected to remain slightly enhanced through
21 Jun due to CH HSS influences.

Geospace

.24 hr Summary...
The geomagnetic field was at quiet to unsettled levels under waning CH
HSS influences.

.Forecast...
The geomagnetic field is expected to continue at quiet to unsettled
levels on 20-21 Jun as CH HSS influences diminish. Mostly quiet
conditions are expected to prevail on 22 Jun.