[Ips-dsgr] ASWFC Daily Report - 10 August 26 issued 2330 UT on 10 Aug 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Tue Aug 11 09:30:49 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/10 AUGUST 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 10 AUGUST AND FORECAST FOR 11 AUGUST - 13 AUGUST
STATUS INDICATORS SOL:GREEN MAG:** YELLOW ** ION: ** YELLOW **
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 10 Aug: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 10 Aug: 95/41
1B. SOLAR FORECAST
11 Aug 12 Aug 13 Aug
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 92/37 95/41 98/45
COMMENT: Solar flare activity on UT day 10-Aug was at the R0
level, with no significant flaring activity. There are currently
three numbered regions visible on the solar disk and one unnumbered
region. Active Region (AR) 4503 (S17W10, beta) is the most magnetically
complex region on the disk and has exhibited mild growth over
the UT day. An unnumbered region recently rotated over the eastern
limb near N06E88 (alpha) and appears stable. All other regions
are either stable or in decay. Solar flare activity is expected
to be at the R0 level over 11-13 Aug. S0 solar radiation storm
conditions were observed on UT day 10-Aug. S0 solar radiation
storm conditions are expected over 11-13 Aug. No Earth-directed
coronal mass ejections (CMEs) have been observed. The solar wind
speed on UT day 10-Aug decreased, ranging between 455 and 360
km/s, and is currently near 360 km/s. The peak total interplanetary
magnetic field strength (IMF, Bt) was 7 nT and the north-south
IMF component (Bz) range was -4 to +4 nT. The solar wind speed
is expected to increase over 11-12 Aug due to the combined effects
of high speed wind streams from multiple small coronal holes
and two glancing CME arrivals.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 10 Aug: G0
Estimated Indices 10 Aug : A K
Australian Region 2 11120000
Cocos Island 1 11110000
Darwin 2 12110000
Townsville 3 12220001
Learmonth 3 22210000
Alice Springs 2 01220000
Gingin 1 11110000
Canberra 1 01120000
Kennaook Cape Grim 1 01120000
Hobart 1 01120000
Estimated Antarctic Regional K Indices 10 Aug :
Macquarie Island 1 00030000
Casey 10 34411101
Mawson 7 32211004
Observed Regional daily pc3 Indices 10 Aug :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 0 (Quiet)
Canberra 0 (Quiet)
Hobart 0 (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 10 Aug : A
Fredericksburg 8
Planetary 8
Observed AFr/Ap Indices 09 Aug : A K
Fredericksburg 9
Planetary 7 3222 112-
2B. MAGNETIC FORECAST
Date Ap Conditions
11 Aug 14 G0, chance of G1
12 Aug 18 G0, chance of G1
13 Aug 8 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian,
planetary and Antarctic regions on UT day 10-Aug. G0 planetary
geomagnetic conditions are expected over 11-13 Aug, with a chance
of G1 over 11-12 Aug due to a combination of high speed wind
stream effects from multiple small coronal holes and two anticipated
glancing CME arrivals.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
10 Aug Normal-fair Fair Fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
11 Aug Normal Normal Normal-fair
12 Aug Normal Normal-fair Fair
13 Aug Normal Normal Normal-fair
COMMENT: Global high-frequency (HF) radio propagation conditions
on UT day 10-Aug were mostly fair, with degradations observed
in northern hemisphere regions throughout the UT day. Global
HF propagation conditions are expected to be mostly normal on
11-Aug. Forecast geomagnetic activity may degrade propagation
conditions at mid and high latitudes on 12-Aug. Mostly normal
conditions are expected on 13-Aug.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
10 Aug 35
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 30% during local night.
Northern Australian Region:
Near predicted monthly values during local day.
Depressed by 30% during local night.
Southern Australian Region:
Depressed by 15% during local day.
Depressed by 20% during local night.
Antarctic Region (Casey/Davis/Mawson):
Depressed by 15% 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
11 Aug 40 Depressed 15%/near predicted monthly values
12 Aug 45 Near predicted monthly values
13 Aug 45 Near predicted monthly values
COMMENT: ASWFC HF Communications Warning 71 was issued on 10
August and is current for 11 Aug only. Maximum Usable Frequencies
(MUFs) in the Australian region on UT day 10-Aug were depressed
by 15-30%, with the strongest depressions observed in northern
Australia during local night hours. 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 11-Aug,
then near predicted monthly values over 12-13 Aug.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 09 Aug
Daily Proton Fluence >1 MeV: 9.1E+04
Daily Proton Fluence >10 MeV: 2.0E+04
Daily Electron Fluence >2 MeV: 1.70E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 3%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B2.7
DSCOVR Satellite Solar Wind Day Averaged Data for 09 Aug
Speed: 420 km/sec Density: 5.8 p/cc Temp: 231000 K Bz: 2 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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