[Ips-dsgr] ASWFC Daily Report - 05 August 26 issued 2330 UT on 05 Aug 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Thu Aug 6 09:30:51 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/05 AUGUST 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 05 AUGUST AND FORECAST FOR 06 AUGUST - 08 AUGUST
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 05 Aug: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 05 Aug: 108/58
1B. SOLAR FORECAST
06 Aug 07 Aug 08 Aug
Activity R0, chance of R1 R0, chance of R1 R0, chance of R1
Fadeouts None expected None expected None expected
10.7cm/SSN 110/60 107/57 105/54
COMMENT: Solar flare activity on UT day 05-Aug was at the R0
level, with no significant flares observed. There are currently
six sunspot regions on the visible solar disk, with Active Region
(AR) 4498 (N15W41, beta) being the largest. This region has remained
stable over the past UT day. AR 4502 (S10W34, beta) has shown
mild growth in some of the leader spots over the UT day. All
other regions are either stable or in decay. Solar flare activity
is forecast to remain at the R0 level over 06-08 Aug, with a
chance of R1 due to the presence of region 4498. Solar radiation
storm conditions were at the S0 level throughout 05-Aug, and
are forecast to remain at the S0 level over 06-08 Aug. No Earth-directed
coronal mass ejections (CMEs) have been observed during the UT
day. The solar wind speed was at a constant light to moderate
level over 05-Aug, broadly ranging between 340-420 km/s throughout
the UT day. The interplanetary magnetic field strength (IMF,
Bt) remained low during 05-Aug, peaking at 4 nT. The north-south
component (Bz) of the IMF ranged between -3 and +3 nT over the
UT day. The solar wind is expected to remain near background
values over 06 Aug, before rising on 07-Aug due to the glancing
impacts of the CMEs first observed on 03-Aug and rising again
on 08-Aug due to a glancing CME impact possible at Earth from
a CME first observed 04/1323UT.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 05 Aug: G0
Estimated Indices 05 Aug : A K
Australian Region 1 11100000
Cocos Island 0 10000000
Darwin 1 11100001
Townsville 2 11100002
Learmonth 1 12100000
Alice Springs 1 01100001
Gingin 1 11100000
Canberra 0 01000000
Kennaook Cape Grim 0 01000000
Hobart 0 01000000
Estimated Antarctic Regional K Indices 05 Aug :
Macquarie Island 0 00000000
Casey 4 23300000
Mawson 4 21200013
Observed Regional daily pc3 Indices 05 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 05 Aug : A
Fredericksburg 6
Planetary 5
Observed AFr/Ap Indices 04 Aug : A K
Fredericksburg 11
Planetary 10 4332 1111
2B. MAGNETIC FORECAST
Date Ap Conditions
06 Aug 5 G0
07 Aug 12 G0, slight chance of G1
08 Aug 10 G0, slight chance of G1
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on 04-Aug, with G0 conditions also recorded at the planetary
level. G0 geomagnetic conditions were reported in the Antarctic
region. G0 geomagnetic conditions are forecast for 06-Aug. G0,
with a slight chance of G1 conditions are forecast on 07-08 Aug
due to the glancing impacts of several CMEs observed over 03-Aug
and 04-Aug.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
05 Aug Normal Normal Fair-normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
06 Aug Normal Normal Normal
07 Aug Normal Normal Normal-fair
08 Aug Normal Normal Normal-fair
COMMENT: Global high-frequency (HF) radio propagation conditions
on UT day 05-Aug were mostly normal, with fair conditions reported
in high latitude northern hemisphere locations. Degradations
were also observed in North American regions early in the UT
day. Global HF propagation conditions are forecast to be mostly
normal over the period 06-08 Aug.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
05 Aug 59
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.
No data available during local night.
Northern Australian Region:
Near predicted monthly values during local day.
Depressed by 20% during local night.
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
Jul 75
Aug 64
Sep 61
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
06 Aug 70 Near predicted monthly values
07 Aug 70 Near predicted monthly values
08 Aug 70 Near predicted monthly values
COMMENT: Maximum Usable Frequencies (MUFs) on UT day 05-Aug in
the Australian region were mostly near predicted values, with
depressions of up to 20% were observed at across Northern Australia
overnight. Strong spread-F and sporadic E were observed during
local night hours at Darwin, with spread-F also observed at Learmonth
and Canberra. MUFs are forecast to remain near predicted values
over 06-08 Aug.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 04 Aug
Daily Proton Fluence >1 MeV: 2.1E+06
Daily Proton Fluence >10 MeV: 1.9E+04
Daily Electron Fluence >2 MeV: 1.30E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 2%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B4.3
DSCOVR Satellite Solar Wind Day Averaged Data for 04 Aug
Speed: 403 km/sec Density: 2.3 p/cc Temp: 84900 K Bz: 0 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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