[Ips-dsgr] ASWFC Daily Report - 07 September 26 issued 2330 UT on 07 Sep 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Tue Sep 8 09:30:51 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/07 SEPTEMBER 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 07 SEPTEMBER AND FORECAST FOR 08 SEPTEMBER - 10 SEPTEMBER
STATUS INDICATORS SOL:** YELLOW ** MAG:** YELLOW ** ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 07 Sep: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 07 Sep: 110/60
1B. SOLAR FORECAST
08 Sep 09 Sep 10 Sep
Activity R0-R1 R0-R1 R0-R1
Fadeouts Possible Possible Possible
10.7cm/SSN 110/60 110/60 110/60
COMMENT: Solar flare activity on UT day 7-Sep was R0, with no
solar flares. There are currently 8 numbered sunspot regions
on the solar disk. Active region (AR) 4530 (N19E21, beta) has
shown some slight growth but remains a small region. All other
sunspot regions are stable. Solar flare activity is expected
to be R0-R1 over 8-10 Sep. On UT day 7-Sep
a large CME was observed from 0212 UT but has been analysed as
a farside event and therefore not geoeffective. A small filament
eruption in the northeast solar quadrant was observed from 0804
UT. A small CME was likely launched, but this event weakened
to such a degree that it is unlikely to noticeably impact the
Earth. S0 solar radiation storm conditions were observed on UT
day 7-Sep. S0 solar radiation storm conditions are expected over
8-10 Sep. On UT day 7-Sep the solar wind environment became disturbed
from 0600 UT. The solar wind speed ranged from 345 to 500 km/s.
The peak total interplanetary field strength (IMF, Bt) was 17
nT and the north-south IMF component range (Bz) was +8 to -14
nT with several periods of southward oriented IMF. The source
of the disturbance was possibly a co-rotating interaction (CIR) region combined
with a recent CME. The solar wind environment is expected to
remain disturbed over 8-9 Sep due to CME arrivals on 8-Sep and
then again on 9-Sep, with effects continuing into 10-Sep. Coronal
hole effects from the CIR are likely to linger over 8-9 Sep.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 07 Sep: G0
Estimated Indices 07 Sep : A K
Australian Region 13 12233343
Cocos Island 10 12233332
Darwin 13 12233343
Townsville 13 12243333
Learmonth 14 12233443
Alice Springs 12 02233343
Gingin 14 12233443
Canberra 11 31232333
Kennaook Cape Grim 12 12232343
Hobart 13 12332343
Estimated Antarctic Regional K Indices 07 Sep :
Macquarie Island 20 01553432
Casey 14 2343332-
Mawson 33 32344565
Observed Regional daily pc3 Indices 07 Sep :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 0 (Quiet)
Canberra 2 (Quiet)
Hobart 7 (Quiet)
Pc3 pulsations are high frequency (10-45 second period) variations
of the Earths magnetic field. Daily pc3-indices are the daily sum
of 20 minute pc3-indices for that station and have been shown to be
well correlated with rejection of high resolution aeromagnetic
survey flight-line data.
NOTE: Indices may have been generated from data obtained in
cooperation with the following organisations: Geoscience Australia,
University of Newcastle Space Physics Group, Australian Government
Antarctic Division and International Center for Space Weather
Science and Education, Japan.
Estimated AFr/Ap Indices 07 Sep : A
Fredericksburg 14
Planetary 20
Observed AFr/Ap Indices 06 Sep : A K
Fredericksburg 5
Planetary 5 1111 1122
2B. MAGNETIC FORECAST
Date Ap Conditions
08 Sep 18 G0-G1
09 Sep 22 G0-G1, chance G2
10 Sep 13 G0, chance G1
COMMENT: ASWFC Geomagnetic Warning 54 was issued on 7 September
and is current for 7-9 Sep. G0 geomagnetic conditions were observed
in the Australian region on UT day 7-Sep. G0-G2 geomagnetic conditions
were observed in the Antarctic region. G0-G1 geomagnetic conditions
are expected on 8-Sep due to an anticipated CME impact, and then
G0-G1 geomagnetic conditions with a chance of G2 are expected
on 9-Sep due to a second impact. Residual effects are likely
to continue into 10-Sep, giving a chance of G1 on this day.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
07 Sep Normal-fair Fair Fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
08 Sep Fair Fair Fair
09 Sep Fair Fair Fair-poor
10 Sep Normal-fair Normal-fair Fair
COMMENT: HF radio propagation conditions were mildly variable
on UT day 7-Sep, with some degraded conditions observed periodically
throughout the day. Degradations were mostly observed at mid
to high latitudes. HF radio propagation conditions may be similarly
degraded over 8-10 Sep due to anticipated geomagnetic activity
over this period.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
07 Sep 61
Observed Australian Regional MUFs
Cocos Island Region:
No data available during local day.
No data available during local night.
Niue Island Region:
Near predicted monthly values.
Northern Australian Region:
Near predicted monthly values during local day.
Enhanced by 15% during local night.
Southern Australian Region:
Near predicted monthly values during local day.
Enhanced by 15% during local night.
Antarctic Region (Casey/Davis/Mawson):
Near predicted monthly values over the UT day.
Monthly T index:
Month T index
Aug 66
Sep 62
Oct 60
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
08 Sep 70 Near predicted monthly values
09 Sep 70 Near predicted monthly values to 15% depressed
10 Sep 60 Near predicted monthly values to 15% depressed
COMMENT: ASWFC SWF HF Communications Warning 79 was issued on
6 September and is current for 6-8 Sep. Maximum usable frequencies
(MUFs) in the Australian region on UT day 7-Sep were near predicted
values to 15% enhanced. Spread-F was observed in Hobart during
local night hours. MUFs are expected to be mostly near predicted
values over 8-10 Sep, with some high latitude depressions of
15% possible over 9-10 Sep due to anticipated geomagnetic activity.
Degraded conditions may be observed over 8-10 Sep.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 06 Sep
Daily Proton Fluence >1 MeV: 4.5E+06
Daily Proton Fluence >10 MeV: 1.8E+05
Daily Electron Fluence >2 MeV: 3.30E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 5%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B3.6
Solar Wind Day Averaged Data for 06 Sep
Speed: 349 km/sec Density: 4.9 p/cc Temp: 92500 K Bz: 0 nT
(Courtesy Space Weather Prediction Center, Boulder USA)
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Australian Space Weather Forecasting Centre
Bureau of Meteorology
ASWFC at bom.gov.au
www.bom.gov.au | www.sws.bom.gov.au
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