[Ips-dsgr] ASWFC Daily Report - 11 September 26 issued 2330 UT on 11 Sep 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sat Sep 12 09:30:50 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/11 SEPTEMBER 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 11 SEPTEMBER AND FORECAST FOR 12 SEPTEMBER - 14 SEPTEMBER
STATUS INDICATORS SOL:GREEN MAG:** YELLOW ** ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 11 Sep: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 11 Sep: 110/60
1B. SOLAR FORECAST
12 Sep 13 Sep 14 Sep
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 110/60 112/63 110/60
COMMENT: Solar flare activity on UT day 11-Sep was R0, with no
solar flares. There are currently seven numbered sunspots, however
all regions are currently stable and with a simple magnetic configuration.
Solar flare activity is expected to be R0 over 12-14 Sep. No
CMEs were observed on UT day 11-Sep. S0 solar radiation storm
conditions were observed on UT day 11-Sep. S0 solar radiation
storm conditions are expected over 12-14 Sep. The solar wind
environment on UT day 11-Sep was at background levels. The solar
wind speed ranged between 450 to 400 km/s over the day. The peak
total interplanetary field strength (IMF, Bt) was 5 nT and the
north-south IMF component (Bz) range was +4 to -4 nT. The solar
wind environment is expected to be mostly at background levels
over 12-13 Sep, with connection to a coronal hole possible on
14-Sep to enhance conditions.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 11 Sep: G0
Estimated Indices 11 Sep : A K
Australian Region 6 12222212
Cocos Island 3 12122100
Darwin 7 22222213
Townsville 7 12232212
Learmonth 6 12222212
Alice Springs 5 12122202
Gingin 6 12222212
Canberra 6 12232102
Kennaook Cape Grim 7 12232212
Hobart 7 12232212
Estimated Antarctic Regional K Indices 11 Sep :
Casey 10 34321112
Mawson 11 34322212
Observed Regional daily pc3 Indices 11 Sep :
Darwin 0 (Quiet)
Townsville 8 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 2 (Quiet)
Canberra 2 (Quiet)
Hobart 3 (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 11 Sep : A
Fredericksburg 9
Planetary 10
Observed AFr/Ap Indices 10 Sep : A K
Fredericksburg 8
Planetary 9 3322 21--
2B. MAGNETIC FORECAST
Date Ap Conditions
12 Sep 7 G0
13 Sep 9 G0
14 Sep 16 G0-G1
COMMENT: G0 geomagnetic conditions were observed in the Australian
and Antarctic region on UT day 11-Sep. G0 geomagnetic conditions
are expected over 12-13 Sep. There is a chance for G1 geomagnetic
conditions due to possible connection with a coronal hole on
14-Sep.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
11 Sep Normal Normal Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
12 Sep Normal Normal Normal
13 Sep Normal Normal Normal
14 Sep Normal Normal Normal
COMMENT: HF radio propagation conditions on UT day 11-Sep were
mostly normal, with some mild degradations in the northern hemisphere
for most of the day. HF radio propagation conditions are expected
to be mostly normal over 12-14 Sep.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
11 Sep 54
Observed Australian Regional MUFs
Cocos Island Region:
No data available during local day.
No data available during local night.
Niue Island Region:
Depressed by 20% during local day.
Depressed by 30% during local night.
Northern Australian Region:
Near predicted monthly values.
Southern Australian Region:
Near predicted monthly values.
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
12 Sep 65 Near predicted monthly values to 15% enhanced
13 Sep 70 Near predicted monthly values to 15% enhanced
14 Sep 70 Near predicted monthly values to 15% enhanced
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region were mostly near predicted values on UT day 11-Sep. Spread-F
was observed in Learmonth and Hobart during local night hours.
MUFs are expected to be near predicted values over 12-14 Sep,
with 15% enhancements.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 10 Sep
Daily Proton Fluence >1 MeV: 9.9E+04
Daily Proton Fluence >10 MeV: 2.0E+04
Daily Electron Fluence >2 MeV: 1.00E+08 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability:10%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B3.3
Solar Wind Day Averaged Data for 10 Sep
Speed: 441 km/sec Density: 2.6 p/cc Temp: 101000 K Bz: -1 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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