Message 30390 in SOLAR.WW
From: VA2OM
Date: Mon, 21 Sep 26 09:19:00 Z
Newsgroups: SOLAR.WW
Subject: Solar and Geomagnetic Activity
Message-ID: <18615_VE2PKT>
Path: N2MH4|GB7BED|K1AJD|VE3CGR|VE2PKT
R:260921/0923Z 37491@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260921/0922Z 18008@GB7BED.#21.GBR.EU LinBPQ6.0.25
R:260921/0922Z 1808@K1AJD.#AUG.GA.USA.NOAM LinBPQ6.0.25
R:260921/0921Z 1743@VE3CGR.#SCON.ON.CAN.NOAM LinBPQ6.0.25
R:260921/0919Z 18615@VE2PKT.#TRV.QC.CAN.NOAM LinBPQ6.0.25
:Product: Weekly Highlights and Forecasts
:Issued: 2026 Sep 21 0317 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
# https://www.swpc.noaa.gov/content/subscription-services
#
# Weekly Highlights and Forecasts
#
Highlights of Solar and Geomagnetic Activity
14 - 20 September 2026
Solar activity was at very low levels on 14-18 Sep and increased to
low levels on 19-20 Sep. Region 4535 (N12, L=353, class/area Hrx/020
on 20 Sep) produced a C1.1 flare at 20/0518 UTC, while Region 4534
(N11, L=074, class/area Dro/030 on 20 Sep) produced a C3.7/1f flare
at 20/2234 UTC, the largest of the period. No Earth-directed CMEs
were detected during the highlight period.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit was at
high levels on 14 Sep when a maximum flux of 4,650 pfu was observed
at 14/1315 UTC. Low to moderate levels were observed on 15-20 Sep.
Geomagnetic field activity reached unsettled levels on 14-17 Sep,
with isolated active levels observed on 14 and 16 Sep. Unsettled to
active levels were observed on 14 Sep due to a southern hemisphere
filament eruption coupled with a SSBC. Unsettled levels were
observed on 15-17 Sep, with an isolated active period early on 16
Sep, all due to negative polarity CH HSS effects. Quiet to isolated
unsettled levels were observed on 18-20 Sep.
Forecast of Solar and Geomagnetic Activity
21 September - 17 October 2026
Solar activity is expected to be <span style="color: rgb(0, 0, 0);
white-space: pre-wrap;">at low levels, with a slight chance
</span><span style="color: rgb(0, 0, 0); white-space: pre-wrap;">for
moderate to high levels throughout the forecast period. </span>
<span style="color: rgb(0, 0, 0); white-space: pre-wrap;">No proton
events are expected at geosynchronous orbit.</span>
The greater than 2 MeV electron flux at geosynchronous orbit is
expected to be at high levels on 26-30 Sep, 01-03 Oct, and 05-11
Oct. Low to moderate levels are expected on 21-25 Sep, 04 Oct, and
12-17 Oct.
Geomagnetic field activity is expected to <span style="color: rgb(0,
0, 0); white-space: pre-wrap;">reach active to G1 </span><span
style="color: rgb(0, 0, 0); white-space: pre-wrap;">storm levels on
24-25 Sep due to positive polarity CH HSS effects. Unsettled to
active levels are expected on 26-27 Sep and 04-08 Oct due to
positive polarity CH HSS effects. Quiet to unsettled levels are
expected on 11-14 Oct due to negative polarity CH HSS effects.
Largely quiet levels are anticipated for all remaining dates in the
forecast period.</span>
73 de VA2OM, SYSOP of VE2PKT
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