[Ips-dsgr] ASWFC Daily Report - 09 August 26 issued 2330 UT on 09 Aug 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Mon Aug 10 09:30:50 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/09 AUGUST 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 09 AUGUST AND FORECAST FOR 10 AUGUST - 12 AUGUST
STATUS INDICATORS SOL:GREEN MAG:** YELLOW ** ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 09 Aug: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 09 Aug: 94/40
1B. SOLAR FORECAST
10 Aug 11 Aug 12 Aug
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 90/34 90/34 92/37
COMMENT: Solar flare activity on UT day 09-Aug was at the R0
level, with no significant flares observed. There are currently
two numbered active regions (ARs) on the solar disk and one unnumbered
region. AR 4503 (S17W01, beta) showed spot development over the
UT day. An unnumbered region has recently developed at around
N16W73 with beta magnetic characteristics. AR 4504 (S19E16, beta)
showed spot decay over the UT day. All these regions are small,
quiet and magnetically simple. Solar flare activity is forecast
to be at the R0 level over 10-12 Aug due to a lack of complex
active regions. Solar radiation storm conditions were at the
S0 level on 09-Aug and are forecast to remain at this level over
10-12 Aug. No geoeffective coronal mass ejections (CMEs) were
observed on 09-Aug. Further modelling on the CME first observed
at 08/0838UT suggests this CME will impact with less strength
than originally modelled. But a glancing impact is still possible
in the second half of 12-Aug. The solar wind speed increased
over 09-Aug, mostly ranging between 330 km/s and 470 km/s and
is currently at around 440 km/s. The interplanetary magnetic
field strength (IMF, Bt) weakened over the UT day as recent CME
impact effects waned. The maximum field strength was 16 nT, but
dropped to 6 nT for most of the day, and the north south component
(Bz) ranged between +9 and -11 nT. The solar wind speed is expected
to remain at current levels, with a possible slight decline on
10-Aug. High speed wind stream effects from multiple small coronal
holes combined with two anticipated glancing CME impacts suggest
an increase in solar wind speed over 11-12 Aug.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 09 Aug: G0
Estimated Indices 09 Aug : A K
Australian Region 4 22211011
Cocos Island 3 22210010
Darwin 4 22211011
Townsville 4 22211011
Learmonth 5 32211021
Alice Springs 4 22211011
Gingin 5 32211120
Canberra 3 11211011
Kennaook Cape Grim 4 22211011
Hobart 3 12211011
Estimated Antarctic Regional K Indices 09 Aug :
Macquarie Island 4 21132000
Casey 11 34331122
Mawson 17 54322133
Observed Regional daily pc3 Indices 09 Aug :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 0 (Quiet)
Canberra 2 (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 09 Aug : A
Fredericksburg 9
Planetary 11
Observed AFr/Ap Indices 08 Aug : A K
Fredericksburg 13
Planetary 27 1224 5463
2B. MAGNETIC FORECAST
Date Ap Conditions
10 Aug 4 G0
11 Aug 14 G0, chance of G1
12 Aug 18 G0, chance of G1
COMMENT: G0 geomagnetic activity was observed at the planetary
level and in the Australian region. Mostly G0 conditions were
observed in the Antarctic region, with a period of G1 observed
at Mawson. G0 geomagnetic conditions are expected on 10-Aug.
G0 conditions, with a chance of G1 are expected over 11-12 Aug
due to a combination of high speed wind stream effects from several
small coronal holes and two anticipated glancing CME impacts.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
09 Aug Normal-fair Fair-normal Poor-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
10 Aug Normal-fair Normal-fair Normal-fair
11 Aug Normal Normal Normal-fair
12 Aug Normal Normal-fair Fair
COMMENT: Global high-frequency (HF) radio propagation conditions
on UT day 09-Aug were poor at high latitudes and fair to normal
at mid and low latitudes. Degradations were due to recent geomagnetic
activity. Propagation conditions are expected to improve over
10-11 Aug. Potential geomagnetic activity on 11-12 Aug may degrade
propagation conditions at high latitudes on 12-Aug.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
09 Aug 42
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 during local day.
Depressed by 15% during local night.
Northern Australian Region:
Near predicted monthly values during local day.
Depressed by 20% during local night.
Southern Australian Region:
Depressed by 25% during local day.
Near predicted monthly values 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
10 Aug 45 Near predicted monthly values/depressed 5 to
10%
11 Aug 60 Near predicted monthly values
12 Aug 50 Near predicted monthly values
COMMENT: ASWFC HF Communications Warning 70 was issued on 9 August
and is current for 9-10 Aug. Maximum Usable Frequencies (MUFs)
on UT day 09-Aug were depressed during local daylight hours in
the southern Australian region and during local night hours in
the northern Australian region. Depressions appear to be easing
heading into 10-Aug. Spread F and some instances of sporadic
E were observed throughout the Australian region during local
night hours. MUFs are forecast to be near predicted monthly values
over 10-12 Aug, with mild depressions possible on 10-Aug.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 08 Aug
Daily Proton Fluence >1 MeV: 6.7E+05
Daily Proton Fluence >10 MeV: 1.9E+04
Daily Electron Fluence >2 MeV: 1.50E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 3%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B2.2
DSCOVR Satellite Solar Wind Day Averaged Data for 08 Aug
Speed: 336 km/sec Density: 9.6 p/cc Temp: 127000 K Bz: -3 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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