[Ips-dsgr] ASWFC Daily Report - 25 July 25 issued 2332 UT on 25 Jul 2025 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sat Jul 26 09:32:25 AEST 2025
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/25 JULY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 25 JULY AND FORECAST FOR 26 JULY - 28 JULY
STATUS INDICATORS SOL:** YELLOW ** MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 25 Jul: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 25 Jul: 148/102
1B. SOLAR FORECAST
26 Jul 27 Jul 28 Jul
Activity R0-R1 R0-R1 R0-R1
Fadeouts Possible Possible Possible
10.7cm/SSN 155/109 160/114 160/114
COMMENT: Solar activity on UT day 25 Jul was R0, with no solar
flares. There are currently nine numbered sunspot regions on
the solar disk, however all regions are currently stable. Solar
activity is expected to be R0 with a chance for R1 over 26-28
Jul.
No CMEs were observed on UT day 25-Jul. Some weak disturbances
in the corona were observed but no CMEs can be seen in available
imagery.
S0 solar radiation storm conditions were observed on
UT day 25-Jul. S0 solar radiation storm conditions are expected
over 26-28 Jul.
The solar wind environment on UT day 25-Jul was steady. The solar
wind speed was slightly elevated and ranged from 527 to 568 km/s.
The peak total interplanetary field strength (IMF, Bt) was 5 nT
and the north-south IMF component range (Bz) was +5 to -4 nT.
The solar wind is expected to be steady over 26-28 Jul.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 25 Jul: G0
Estimated Indices 25 Jul : A K
Australian Region 4 22111111
Cocos Island 4 22121111
Darwin 7 32121222
Townsville 4 22111112
Learmonth 6 22221222
Alice Springs 4 22111111
Gingin 8 32211232
Canberra 4 22111111
Kennaook Cape Grim 4 22112111
Hobart 4 22112111
Estimated Antarctic Regional K Indices 25 Jul :
Macquarie Island 5 22131110
Casey 13 44322222
Mawson 22 34533244
Observed Regional daily pc3 Indices 25 Jul :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 29 (Quiet to unsettled)
Canberra 13 (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 25 Jul : A
Fredericksburg 7
Planetary 8
Observed AFr/Ap Indices 24 Jul : A K
Fredericksburg 16
Planetary 15 4334 3322
2B. MAGNETIC FORECAST
Date Ap Conditions
26 Jul 15 G0, chance G1
27 Jul 10 G0, chance G1
28 Jul 7 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 25-Jul. G0-G1 geomagnetic conditions were observed
in the Antarctic region. Mostly G0 geomagnetic conditions are
expected over 26-28 Jul. There is a chance for G1 on 26 or 27-Jul
due to a possible CME that left the Sun on 23-Jul.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
25 Jul Normal Normal Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
26 Jul Normal Normal Normal
27 Jul Normal Normal Normal
28 Jul Normal Normal Normal
COMMENT: HF radio propagation conditions on UT day 25-Jul were
slightly degraded at the beginning and end of the day, however
conditions were generally good during the middle of the UT day.
HF radio propagation conditions are expected to be mostly normal
over 26-28 Jul.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
25 Jul 105
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 30% during local day.
Near predicted monthly values during local night.
Niue Island Region:
Near predicted monthly values during local day.
Depressed by 15% during local night.
Northern Australian Region:
Mostly near predicted monthly values.
Depressed by 20% after local dawn.
Southern Australian Region:
Mostly near predicted monthly values.
Antarctic Region (Casey/Davis/Mawson):
Near predicted monthly values 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
26 Jul 95 Near predicted monthly values to 15% depressed
27 Jul 95 Near predicted monthly values to 15% depressed
28 Jul 95 Near predicted monthly values to 15% depressed
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region on UT day 25-Jul were near predicted values to 20% depressed.
Conditions in Hobart during local night hours were degraded.
Scintillation was observed at Weipa from 1444 to 1459 UT. MUFs
are expected to be near predicted values over 26-28 Jul, with
some brief depressions during local night hours.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 24 Jul
Daily Proton Fluence >1 MeV: 4.2E+05
Daily Proton Fluence >10 MeV: 1.6E+04
Daily Electron Fluence >2 MeV: 2.10E+07
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B9.8
DSCOVR Satellite Solar Wind Day Averaged Data for 24 Jul
Speed: 621 km/sec Density: 1.3 p/cc Temp: 210000 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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