:Product: Weekly Highlights and Forecasts
:Issued: 2026 Jul 20 0157 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
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# Weekly Highlights and Forecasts
#
Highlights of Solar and Geomagnetic Activity
13 - 19 July 2026

Solar activity was at low levels. No R1 (Minor) events were
observed. The strongest flare observed was a C8.9 flare from Region
4491 (S11, L=155, class/area=Hrx/020 on 17 Jul). The other eight
active regions were either quiet or only produced low-level C-class
activity.

Other activity included an area of large-scare reconnection in the
SW quadrant early on 19 Jul. A double ribbon signature was observed
in multiple SUVI wavelengths. Subsequent LASCO C2 imagery contained
a slow-moving CME signature to the west that lined up well with the
event's timing. No active regions or filaments were identified
as sources for the eruption. Most of the ejecta is expected to pass
upstream of Earth; however, given its source location on the Sun, a
glancing blow is possible on days three or four (23-24 Jul).

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit reached
high levels on 13 Jul and dropped to moderate levels over 14-15 Jul
following activity from a passing CME. Coronal hole activity on
15-16 Jul increased levels to high from 16-19 Jul.

Geomagnetic field activity reached active levels on 13 Jul due to
waning CME effects. Active levels on 25 Jul and unsettled levels on
16 Jul were in response to influence from a weak positive polarity
CH HSS. The remainder of the summary period was at quiet levels.

Forecast of Solar and Geomagnetic Activity
20 July - 15 August 2026

Solar activity is expected to be at mostly low levels, with a slight
chance for moderate (R1-R2/Minor-Moderate) activity, throughout the
outlook period.

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is are
likely to reach high levels over 24-27 Jul and 02-07 Aug due to the
anticipated influence of multiple, recurrent, coronal hole HSSs. The
remainder of the outlook period is expected to be at mostly quiet
levels.

Geomagnetic field activity is likely to reach G1 (Minor) geomagnetic
storm levels on 22 Jul as a negative polarity CH HSS becomes
geoeffective. Conditions are likely to decrease to active on 23 Jul
and unsettled on 24 Jul as coronal influence wanes. Subsequent
coronal holes are likely to cause active conditions on 01 Aug and
04-05 Aug, with unsettled levels likely over 02 Aug and 06 Aug. The
remainder of the outlook period is likely to observed mostly quiet
conditions.


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