[Ips-dsgr] ASWFC Daily Report - 11 August 26 issued 2330 UT on 11 Aug 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Wed Aug 12 09:30:48 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/11 AUGUST 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 11 AUGUST AND FORECAST FOR 12 AUGUST - 14 AUGUST
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: ** YELLOW **
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 11 Aug: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 11 Aug: 96/43
1B. SOLAR FORECAST
12 Aug 13 Aug 14 Aug
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 98/45 98/45 100/48
COMMENT: Solar flare activity on UT day 11-Aug was at the R0
level, with only low level C-class flares observed. There are
currently four numbered sunspot regions visible on the solar
disk. Newly numbered Active Region (AR) 4507 (N04E48, beta) recently
appeared on the disk and has shown spot growth over the UT day.
AR 4506 (N12E30, beta) has exhibited mild spot growth. All other
regions are either stable or in decay. Solar flare activity is
expected to be at the R0 level over 12-14 Aug. S0 solar radiation
storm conditions were observed on UT day 11-Aug and are forecast
to remain at the S0 level over 12-14 Aug. No Earth-directed coronal
mass ejections (CMEs) have been observed. The solar wind speed
on UT day 11-Aug increased, ranging between 330 and 455 km/s,
and is currently near 435 km/s. The peak total interplanetary
magnetic field strength (IMF, Bt) was 10 nT and the north-south
IMF component (Bz) range was -8 to +7 nT. A moderate solar wind
shock was observed in the solar wind parameters at 11/1033UT,
indicative of a CME arrival. A period of mostly southward IMF
conditions followed over the interval 11/1222-1518UT. The solar
wind speed is expected to remain elevated over 12-13 Aug due
to ongoing CME effects and a possible additional glancing CME
arrival on 12-Aug. A small northern hemisphere coronal hole is
currently crossing the central meridian and is expected to influence
the solar wind speed on 14-Aug.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 11 Aug: G0
Estimated Indices 11 Aug : A K
Australian Region 4 00022311
Cocos Island 4 01122300
Darwin 5 11122301
Townsville 7 11132312
Learmonth 7 00132411
Alice Springs 4 00022301
Gingin 3 00011310
Canberra 4 00022301
Kennaook Cape Grim 4 00022311
Hobart 4 00022311
Estimated Antarctic Regional K Indices 11 Aug :
Macquarie Island 2 00002300
Casey 5 22222210
Mawson 6 30021321
Observed Regional daily pc3 Indices 11 Aug :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 0 (Quiet)
Canberra 8 (Quiet)
Hobart 11 (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 Aug : A
Fredericksburg 8
Planetary 10
Observed AFr/Ap Indices 10 Aug : A K
Fredericksburg 5
Planetary 5 2122 1002
2B. MAGNETIC FORECAST
Date Ap Conditions
12 Aug 14 G0, chance of G1
13 Aug 8 G0
14 Aug 12 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian,
planetary and Antarctic regions on UT day 11-Aug. A weak sudden
impulse (9 nT) was observed in Bureau magnetometer data at 11/1128UT,
confirming the arrival of a CME at Earth, however no significant
geomagnetic activity followed. G0 planetary geomagnetic conditions
are expected over 12-14 Aug, with a chance of G1 on 12-Aug due
to ongoing CME effects and a possible additional glancing CME
arrival on this day.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
11 Aug Normal-fair Normal-fair Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
12 Aug Normal Normal Normal-fair
13 Aug Normal Normal Normal-fair
14 Aug Normal Normal Normal-fair
COMMENT: Global high-frequency (HF) radio propagation conditions
on UT day 11-Aug were normal to fair, with degradations observed
in northern hemisphere regions in the first half of the UT day.
Global HF propagation conditions are expected to be mostly normal
over 12-14 Aug.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
11 Aug 41
Observed Australian Regional MUFs
Cocos Island Region:
No data available during local day.
No data available during local night.
Niue Island Region:
Depressed by 15% during local day.
Depressed by 20% during local night.
Depressed by 20% after local dawn.
Northern Australian Region:
Mostly near predicted monthly values.
Southern Australian Region:
Near predicted monthly values during local day.
Depressed by 15% during local night.
Antarctic Region (Casey/Davis/Mawson):
Near predicted monthly values over the UT day.
Monthly T index:
Month T index
Jul 75
Aug 64
Sep 61
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
12 Aug 35 Depressed 15%/near predicted monthly values
13 Aug 45 Near predicted monthly values
14 Aug 45 Near predicted monthly values
COMMENT: ASWFC HF Communications Warning 72 was issued on 11
August and is current for 12 Aug only. Maximum Usable Frequencies
(MUFs) in the Australian region on UT day 11-Aug were near predicted
monthly values to 15% depressed. Spread F was observed at several
Australian sites during local night hours. MUFs are forecast
to be near predicted monthly values to 15% depressed on 12-Aug,
then near predicted monthly values over 13-14 Aug.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 10 Aug
Daily Proton Fluence >1 MeV: 5.3E+04
Daily Proton Fluence >10 MeV: 2.0E+04
Daily Electron Fluence >2 MeV: 2.30E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 4%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B3.3
DSCOVR Satellite Solar Wind Day Averaged Data for 10 Aug
Speed: 405 km/sec Density: 3.2 p/cc Temp: 134000 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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