[Ips-dsgr] ASWFC Daily Report - 03 August 26 issued 2330 UT on 03 Aug 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Tue Aug 4 09:30:50 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/03 AUGUST 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 03 AUGUST AND FORECAST FOR 04 AUGUST - 06 AUGUST
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 03 Aug: Low
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 03 Aug: 126/79
1B. SOLAR FORECAST
04 Aug 05 Aug 06 Aug
Activity R0, chance of R1 R0, chance of R1 R0, chance of R1
Fadeouts None expected None expected None expected
10.7cm/SSN 120/72 115/66 110/60
COMMENT: Solar flare activity was at the R0 level on 03-Aug,
with no significant flares observed over the UT day. There are
currently six active sunspot regions on the disk, with Active
Region (AR) 4498 (N14W14, beta) being the largest. This region
has remained mostly stable over the past UT day. Regions 4499
(N04W46, beta) and 4502 (S11W08, beta) both exhibited some growth
over the same period. All other regions are stable. Solar flare
activity is forecast to be at the R0 level over 04-06 Aug, with
a chance of R1 due to the size of AR 4498. S0 solar radiation
storm conditions were observed throughout 03-Aug, with the solar
proton flux having returned to background values. S0 solar radiation
storm conditions are forecast over 04-06 Aug. Three faint, low-velocity
coronal mass ejections (CMEs) were observed over the previous
UT day. The first was visible in Stereo-A from 02/0353UT. The
second CME was visible in Stereo-A following activity near AR
4498 from 03/0838UT, and the third was visible in Stereo-A at
03/1223UT, following a filament liftoff at S34W04 visible in
GONG/Halpha at 03/0912UT. While imaging of these faint, low-velocity
events is limited, initial modelling suggests a minor impact
with Earth from a combined front at 07/0700UT +/- 12 hours. However,
further modelling will be conducted when more imaging becomes
available. The solar wind environment continued to return to
background conditions over UT day 03-Aug following a previous
CME arrival. The solar wind speed was broadly constant throughout
the UT day, ranging between 360-410 km/s. The interplanetary
magnetic field strength (IMF, Bt) peaked at 15 nT early in the
UT day, with the north-south component (Bz) ranging between -10
and +8 nT over the UT day. Several extended periods of southward
Bz were observed over 03-Aug, with periods between 02/2327-03/0400UT,
03/0647-1159UT, and 03/1545-1739UT. A separate period of southward
Bz began at 03/1835UT and is ongoing. The solar wind is expected
to remain on a declining trend over 04-06 Aug, approaching background
values as the effects of the previous CME impact subside.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 03 Aug: G0
Estimated Indices 03 Aug : A K
Australian Region 10 33223123
Cocos Island 8 22222133
Darwin 8 32223122
Townsville 12 33333123
Learmonth 11 33223133
Alice Springs 11 33223033
Gingin 9 32222133
Canberra 8 22223023
Kennaook Cape Grim 9 23223023
Hobart 10 23233023
Estimated Antarctic Regional K Indices 03 Aug :
Macquarie Island 18 34245023
Casey 12 43322223
Mawson 46 76533235
Observed Regional daily pc3 Indices 03 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 03 Aug : A
Fredericksburg 18
Planetary 21
Observed AFr/Ap Indices 02 Aug : A K
Fredericksburg 15
Planetary 17 1111 4642
2B. MAGNETIC FORECAST
Date Ap Conditions
04 Aug 8 G0
05 Aug 6 G0
06 Aug 6 G0
COMMENT: Geomagnetic conditions were at the G0 level in the Australian
region over 03-Aug, with G0 conditions reported at the planetary
level. G1 geomagnetic conditions were observed in the Antarctic
region, with G2-G3 intervals recorded at Mawson. G0 geomagnetic
conditions are forecast over 04-06 Aug.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
03 Aug Normal Normal-fair Fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
04 Aug Normal Normal Normal-fair
05 Aug Normal Normal Normal
06 Aug Normal Normal Normal
COMMENT: Global high-frequency (HF) radio propagation conditions
were mostly normal on UT day 03-Aug, with depressions observed
in Northern Hemisphere high latitude regions, as well as in the
European and north Atlantic regions at the end of the UT day.
Global HF conditions are forecast to improve over the next 24
hours, to be mostly normal over 04-06 Aug.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
03 Aug 92
Observed Australian Regional MUFs
Cocos Island Region:
No data available during local day.
No data available during local night.
Niue Island Region:
Enhanced by 15% during local day.
Enhanced by 15% during local night.
Northern Australian Region:
Enhanced by 20% during local day.
Enhanced by 15% during local night.
Southern Australian Region:
Enhanced by 15% during local day.
Enhanced by 25% 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
04 Aug 80 Near predicted monthly values
05 Aug 80 Near predicted monthly values
06 Aug 80 Near predicted monthly values
COMMENT: Maximum Usable Frequencies (MUFs) in the Australian
region were enhanced by 15-20% compared with predicted monthly
values. Strong spread-F was observed at Canberra, Hobart, and
Norfolk Island, with sporadic E also present in Hobart. MUFs
are forecast to remain near predicted monthly values to 15-20%
enhanced over 04-06 Aug.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 02 Aug
Daily Proton Fluence >1 MeV: 5.5E+07
Daily Proton Fluence >10 MeV: 3.8E+04
Daily Electron Fluence >2 MeV: 2.40E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 4%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B6.2
DSCOVR Satellite Solar Wind Day Averaged Data for 02 Aug
Speed: 351 km/sec Density: 9.3 p/cc Temp: 197000 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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