[Ips-dsgr] ASWFC Daily Report - 01 August 26 issued 2331 UT on 01 Aug 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sun Aug 2 09:31:27 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/01 AUGUST 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 01 AUGUST AND FORECAST FOR 02 AUGUST - 04 AUGUST
STATUS INDICATORS SOL:** YELLOW ** MAG:** RED ** ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 01 Aug: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 01 Aug: 140/94
1B. SOLAR FORECAST
02 Aug 03 Aug 04 Aug
Activity R0-R1 R0-R1 R0-R1
Fadeouts Possible Possible Possible
10.7cm/SSN 140/94 140/94 135/89
COMMENT: Solar flare activity on UT day 01-Aug was at the R0
level, with no significant flaring activity. There are currently
six numbered regions visible on the solar disk. Active Region
(AR) 4498 (N14E15, beta-gamma) is the largest and most magnetically
complex region on the disk and has shown mild growth in its trailer
spots over the UT day. Region 4501 (S07W24, beta) has exhibited
spot growth over the 24-hour period. Newly numbered region 4502
(S07E21, beta) recently appeared on the solar disk and has shown
mild spot growth. All other regions are either stable or in decay.
Solar flare activity is expected to be at R0-R1 levels over 02-04
Aug, primarily due to the magnetic complexity of region 4498.
S0 solar radiation storm conditions were observed on UT day 01-Aug,
with the proton flux continuing to gradually decline over the
UT day. S0 solar radiation storm conditions are expected over
02-04 Aug. No Earth-directed coronal mass ejections (CMEs) have
been observed. The solar wind speed on UT day 01-Aug decreased,
ranging between 310 and 265 km/s, and is currently near 265 km/s.
The peak total interplanetary magnetic field strength (IMF, Bt)
was 5 nT and the north-south IMF component (Bz) range was -4
to +3 nT. The solar wind speed is expected to increase on 02-Aug
due to the arrival of a CME first observed on 30-Jul, then remain
elevated over 03-04 Aug.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 01 Aug: G0
Estimated Indices 01 Aug : A K
Australian Region 1 11100001
Cocos Island 1 11110000
Darwin 1 11100001
Townsville 2 11101012
Learmonth 1 11010000
Alice Springs 0 10100000
Gingin 1 11100000
Canberra 0 00001001
Kennaook Cape Grim 0 00001001
Hobart 0 00001000
Estimated Antarctic Regional K Indices 01 Aug :
Macquarie Island 0 00002000
Casey 6 23311111
Mawson 5 31111112
Observed Regional daily pc3 Indices 01 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 01 Aug : A
Fredericksburg 6
Planetary 7
Observed AFr/Ap Indices 31 Jul : A K
Fredericksburg 7
Planetary 5 1112 2111
2B. MAGNETIC FORECAST
Date Ap Conditions
02 Aug 28 G2, chance of G3
03 Aug 12 G0, chance of G1
04 Aug 8 G0
COMMENT: ASWFC Geomagnetic Warning 48 was issued on 31 July and
is current for 1-2 Aug. G0 geomagnetic conditions were observed
in the Australian, planetary and Antarctic regions on UT day
01-Aug. G2 planetary geomagnetic conditions are expected on 02-Aug,
with a chance of G3 due to the arrival of a CME first observed
on 30-Jul. G0 geomagnetic conditions are expected on 03-Aug,
with a chance of G1 as CME effects abate. G0 geomagnetic conditions
are expected on 04-Aug.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
01 Aug Normal Normal-fair Normal-fair
PCA Event : 10MeV Proton/PCA Event Began at 1835UT 30/07, Ended at 0115UT 31/07
and, 10MeV Proton/PCA Event Began at 0310UT 31/07, Ended at 0425UT 31/07
and, 10MeV Proton/PCA Event Began at 1350UT 31/07, Ended at 1735UT 31/07
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
02 Aug Fair Fair Fair-poor
03 Aug Normal Normal Normal-fair
04 Aug Normal Normal Normal-fair
COMMENT: Global high-frequency (HF) radio propagation conditions
were mostly normal on UT day 01-Aug, with some degradations observed
in southern hemisphere regions in the second half of the UT day.
Global HF propagation conditions expected to be fair on 02-Aug,
due to forecast geomagnetic activity on this day. Conditions
are expected to return to mostly normal over 03-04 Aug. Shortwave
fadeouts are possible.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
01 Aug 81
Observed Australian Regional MUFs
Cocos Island Region:
No data available during local day.
No data available during local night.
Niue Island Region:
Enhanced by 20% during local day.
Near predicted monthly values during local night.
Northern Australian Region:
Near predicted monthly values during local day.
Depressed by 15% during local night.
Southern Australian Region:
Mostly near predicted monthly values.
Antarctic Region (Casey/Davis/Mawson):
Enhanced by 25% 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
02 Aug 55 Near predicted monthly values/depressed 10 to
15%
03 Aug 60 Near predicted monthly values/depressed 10 to
15%
04 Aug 75 Near predicted monthly values
COMMENT: Maximum Usable Frequencies (MUFs) in the Australian
region on 01-Aug were mostly near predicted monthly values, with
depressions of 15% observed in the northern Australian region.
Spread-F was observed at several Australian sites during local
night hours. MUFs are forecast to be near predicted monthly values
over 02-04 Aug, with depressions of 10-15% possible over 02-03
Aug due to forecast geomagnetic activity. Shortwave fadeouts
are possible.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 31 Jul
Daily Proton Fluence >1 MeV: 3.8E+07
Daily Proton Fluence >10 MeV: 7.1E+05
Daily Electron Fluence >2 MeV: 4.20E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 6%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B8.7
DSCOVR Satellite Solar Wind Day Averaged Data for 31 Jul
Speed: 315 km/sec Density: 3.9 p/cc Temp: 71700 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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