[Ips-dsgr] ASWFC Daily Report - 29 August 25 issued 2330 UT on 29 Aug 2025 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sat Aug 30 09:30:48 AEST 2025
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/29 AUGUST 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 29 AUGUST AND FORECAST FOR 30 AUGUST - 01 SEPTEMBER
STATUS INDICATORS SOL:** YELLOW ** MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 29 Aug: R0
Flares Max Fadeout Freq. Sectors
M1.0 0416UT possible lower E. Asia/Aust.
Observed 10.7 cm flux/Equivalent Sunspot Number for 29 Aug: 222/172
1B. SOLAR FORECAST
30 Aug 31 Aug 01 Sep
Activity R1-R2 R1-R2 R1-R2
Fadeouts Possible Possible Possible
10.7cm/SSN 225/175 230/180 220/170
COMMENT: Solar activity on UT day 29-Aug was R0, with no solar
flares. There are currently six numbered sunspot regions on the
solar disk. AR4197 (S17E05, beta-gamma) remains the most complex
region on the disk and has grown over the past day. This region
has potential to develop delta spots to increase its complexity.
All other sunspot regions are either stable or in decay. Solar
activity is expected to be R1-R2 over 30-Aug to 1-Sep.
A CME was observed from 29/1700 UT off the southwestern solar limb,
however this has been analysed as a farside event and therefore
not Earth-directed. No other CMEs were observed.
The >10 MeV protons remain slightly enhanced, although on a downward trend.
S0 solar radiation storm conditions were observed on UT day 29-Aug.
S0 solar radiation storm conditions are expected over 30-Aug to
1-Sep.
The solar wind environment on UT day 29-Aug was stable
and near background levels. The solar wind speed ranged from
358 to 445 km/s and is on a steady trend. The peak total interplanetary
field strength (IMF, Bt) was 6 nT and the north-south IMF component
range (Bz) was +6 to -5 nT. The solar wind environment is expected
to remain near background levels over 30-Aug to 1-Sep.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 29 Aug: G0
Estimated Indices 29 Aug : A K
Australian Region 5 22111122
Cocos Island 3 12110021
Darwin 5 22111122
Townsville 5 22111122
Learmonth 4 22110122
Alice Springs 4 12111122
Gingin 4 22100122
Canberra 3 12100112
Kennaook Cape Grim 4 22101112
Hobart 3 12101111
Estimated Antarctic Regional K Indices 29 Aug :
Macquarie Island 1 12000001
Casey 13 44321123
Mawson 19 33220164
Observed Regional daily pc3 Indices 29 Aug :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 0 (Quiet)
Canberra 4 (Quiet)
Hobart 15 (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 29 Aug : A
Fredericksburg 5
Planetary 5
Observed AFr/Ap Indices 28 Aug : A K
Fredericksburg 7
Planetary 7 22322122
2B. MAGNETIC FORECAST
Date Ap Conditions
30 Aug 4 G0
31 Aug 4 G0
01 Sep 4 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 29-Aug. G0-G2 geomagnetic conditions were observed
in the Antarctic region. G0 geomagnetic conditions are expected
over 30-Aug to 1-Sep.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
29 Aug Normal Normal Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
30 Aug Normal Normal Fair
31 Aug Normal Normal Normal-fair
01 Sep Normal Normal Normal
COMMENT: HF radio propagation conditions on UT day 29-Aug were
normal, with some residual polar cap absorption affecting high
latitudes. HF radio propagation conditions are expected to be
mostly normal over 30-Aug to 1-Sep. Shortwave fadeouts are possible.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
29 Aug 112
Observed Australian Regional MUFs
Cocos Island Region:
No data available during local day.
No data available during local night.
Niue Island Region:
Mostly near predicted monthly values.
Northern Australian Region:
Near predicted monthly values during local day.
Enhanced by 25% during local night.
Southern Australian Region:
Mostly near predicted monthly values.
Enhanced by 20% after local dawn.
Antarctic Region (Casey/Davis/Mawson):
Near predicted monthly values over the UT day.
Monthly T index:
Month T index
Jul 88
Aug 96
Sep 93
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
30 Aug 115 Near predicted monthly values to 25% enhanced
31 Aug 115 Near predicted monthly values to 25% enhanced
01 Sep 115 Near predicted monthly values to 25% enhanced
COMMENT: Maximum usable frequencies (MUFs) on UT day 29-Aug were
near predicted values to 25% enhanced. Conditions were degraded
during local night hours in Darwin. Scintillation was observed
in Darwin and Weipa from 1205 to 1240 UT. MUFs are expected to
be near predicted values to 25% enhanced over 30-Aug to 1-Sep.
Shortwave fadeouts are possible.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 28 Aug
Daily Proton Fluence >1 MeV: 1.7e+07
Daily Proton Fluence >10 MeV: 4.4e+05
Daily Electron Fluence >2 MeV: 1.3e+07
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: C2.9
DSCOVR Satellite Solar Wind Day Averaged Data for 28 Aug
Speed: 392 km/sec Density: 3.2 p/cc Temp: 70700 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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