[Ips-dsgr] ASWFC Daily Report - 12 August 26 issued 2330 UT on 12 Aug 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Thu Aug 13 09:30:50 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/12 AUGUST 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 12 AUGUST AND FORECAST FOR 13 AUGUST - 15 AUGUST
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 12 Aug: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 12 Aug: 99/46
1B. SOLAR FORECAST
13 Aug 14 Aug 15 Aug
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 100/48 102/50 98/45
COMMENT: Solar activity on UT day 12-Aug was R0, with no solar
flares. There are currently four numbered sunspot regions on
the solar disk. Active region (AR) 4503 (S17W38, beta) has grown
rapidly in the past day, but remains a small uncomplicated region.
ARs 4506 (N12E15, beta) and 4507 (N04E33, beta) have matured
and stabilised. Other sunspot regions are stable. Solar activity
over 13-15 Aug is expected to be R0. No Earth directed CMEs were
observed on UT day 12-Aug. S0 solar radiation storm conditions
were observed on UT day 12-Aug. S0 solar radiation storm
conditions are expected over 13-15 Aug. The solar wind environment
on UT day 12-Aug was mostly near background levels, continuing to
settle after the CME impact on 11-Aug. The solar wind speed ranged between
430 and 460 km/s. The peak total interplanetary field strength
(IMF, Bt) was 6 nT and the north-south IMF component range was
+4 to -5 nT. The solar wind is expected to be mostly near background
levels on 13-Aug, and by the end of 14-Aug going into 15-Aug
a small coronal hole may connect with Earth to mildly enhance
the solar wind speed.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 12 Aug: G0
Estimated Indices 12 Aug : A K
Australian Region 4 12122120
Cocos Island 4 12122120
Darwin 4 12122111
Townsville 5 13122111
Learmonth 7 12223130
Alice Springs 4 02122120
Gingin 7 12223230
Canberra 3 02122110
Kennaook Cape Grim 5 12123111
Hobart 4 12122111
Estimated Antarctic Regional K Indices 12 Aug :
Macquarie Island 7 02143111
Casey 8 33322120
Mawson 33 16434264
Observed Regional daily pc3 Indices 12 Aug :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 5 (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 12 Aug : A
Fredericksburg 8
Planetary 8
Observed AFr/Ap Indices 11 Aug : A K
Fredericksburg 6
Planetary 7 1112 3321
2B. MAGNETIC FORECAST
Date Ap Conditions
13 Aug 6 G0
14 Aug 12 G0
15 Aug 14 G0
COMMENT: G0 geomagnetic conditions were observed on UT day 12-Aug.
G0 geomagnetic conditions are expected over 13-15 Aug. A small
coronal hole may connect with the Earth by late 14-Aug or else
on 15-Aug to enhance the solar wind speed, but not expected to
induce any significant activity.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
12 Aug Normal Normal Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
13 Aug Normal Normal Normal
14 Aug Normal Normal Normal
15 Aug Normal Normal Normal-fair
COMMENT: HF radio propagation conditions on UT day 12-Aug were
mostly normal. HF radio propagation conditions are expected to
be mostly normal over 13-15 Aug, with some mild degradations
possible at high latitudes on 15-Aug due to enhanced solar wind
speeds.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
12 Aug 53
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 20% during local night.
Northern Australian Region:
Near predicted monthly values during local day.
Depressed by 20% during local night.
Southern Australian Region:
Mostly near predicted monthly values.
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
13 Aug 60 Near predicted monthly values
14 Aug 55 Near predicted monthly values
15 Aug 45 Near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region on UT day 12-Aug were mostly near predicted values to
20% depressed. Degraded conditions were observed in Darwin during
local night and dawn hours. MUFs are expected to be mostly near
predicted values. Mild depressions are possible during local
night hours on 15-Aug.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 11 Aug
Daily Proton Fluence >1 MeV: 3.9E+05
Daily Proton Fluence >10 MeV: 2.0E+04
Daily Electron Fluence >2 MeV: 2.90E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 5%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B2.5
DSCOVR Satellite Solar Wind Day Averaged Data for 11 Aug
Speed: 437 km/sec Density: 5.8 p/cc Temp: 184000 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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