[Ips-dsgr] ASWFC Daily Report - 31 July 25 issued 2332 UT on 31 Jul 2025 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Fri Aug 1 09:32:28 AEST 2025
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/31 JULY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 31 JULY AND FORECAST FOR 01 AUGUST - 03 AUGUST
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 31 Jul: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 31 Jul: 145/99
1B. SOLAR FORECAST
01 Aug 02 Aug 03 Aug
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 145/99 145/99 145/99
COMMENT: Solar activity on UT day 31-Jul was at the R0 level,
with no significant flaring activity. There are currently nine
numbered sunspot regions visible on the solar disk. Newly numbered
AR4167 (N07W09, beta) is currently the most notable sunspot region
due to its recent growth on the solar disk. AR4166 (N20W39, beta)
has also shown slight growth over the UT day. All other sunspot
regions are either stable or in decay. Solar activity is expected
to be at the R0 level over 01-03 Aug. S0 solar proton conditions
were observed on UT day 31-Jul. S0 solar proton conditions are
expected over 01-03 Aug. No significant Earth-directed CMEs have
been observed. The solar wind speed over 31-Jul mildly decreased,
ranging from 380 to 475 km/s and is currently near 450 km/s.
The peak total interplanetary magnetic field strength (IMF, Bt)
was 9 nT and the north-south IMF component (Bz) range was -6
to +8 nT. The solar wind speed is expected to remain near background
levels over 01-03 Aug.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 31 Jul: G0
Estimated Indices 31 Jul : A K
Australian Region 5 21122211
Cocos Island 4 21211120
Darwin 6 21222222
Townsville 7 22223211
Learmonth 6 21222221
Alice Springs 5 22112211
Gingin 6 21113221
Canberra 5 11123211
Kennaook Cape Grim 6 21123211
Hobart 6 21123211
Estimated Antarctic Regional K Indices 31 Jul :
Macquarie Island 5 10024210
Casey 13 34422222
Mawson 21 54332244
Observed Regional daily pc3 Indices 31 Jul :
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 31 Jul : A
Fredericksburg 9
Planetary 10
Observed AFr/Ap Indices 30 Jul : A K
Fredericksburg 9
Planetary 8 3212 2321
2B. MAGNETIC FORECAST
Date Ap Conditions
01 Aug 6 G0
02 Aug 5 G0
03 Aug 5 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
region and a period of G1 at Mawson on UT day 31-Jul. G0 geomagnetic
conditions are expected over 01-03 Aug.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
31 Jul Normal Normal Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
01 Aug Normal Normal Normal-fair
02 Aug Normal Normal Normal
03 Aug Normal Normal Normal
COMMENT: HF radio propagation conditions on UT day 31-Jul were
mostly normal, with periods of fair conditions at high latitudes.
HF radio propagation conditions are expected to be mostly normal
over 01-03 Aug.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
31 Jul 102
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 25% during local day.
Enhanced by 20% during local night.
Niue Island Region:
Near predicted monthly values.
Northern Australian Region:
Near predicted monthly values during local day.
Depressed by 15% during local night.
Southern Australian Region:
Near predicted monthly values.
Antarctic Region (Casey/Davis/Mawson):
Depressed by 15% over the UT day.
Monthly T index:
Month T index
Jun 79
Jul 104
Aug 102
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
01 Aug 100 Near predicted monthly values
02 Aug 100 Near predicted monthly values
03 Aug 100 Near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) on UT day 31-Jul were
near predicted monthly values in the Australian region. Spread
F was observed during local night hours at Townsville, Brisbane,
Canberra, Hobart and Learmonth. Ionospheric scintillation was
observed at Niue at 31/0808UT. MUFs are expected to be near predicted
monthly values over 01-03 Aug.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 30 Jul
Daily Proton Fluence >1 MeV: 3.4E+05
Daily Proton Fluence >10 MeV: 1.6E+04
Daily Electron Fluence >2 MeV: 2.60E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 4%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B9.8
DSCOVR Satellite Solar Wind Day Averaged Data for 30 Jul
Speed: 419 km/sec Density: 1.0 p/cc Temp: 123000 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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