[Ips-dsgr] ASWFC Daily Report - 02 August 25 issued 2332 UT on 02 Aug 2025 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sun Aug 3 09:32:25 AEST 2025
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/02 AUGUST 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 02 AUGUST AND FORECAST FOR 03 AUGUST - 05 AUGUST
STATUS INDICATORS SOL:** YELLOW ** MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 02 Aug: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 02 Aug: 146/100
1B. SOLAR FORECAST
03 Aug 04 Aug 05 Aug
Activity R0-R1 R0-R1 R0-R1
Fadeouts Possible Possible Possible
10.7cm/SSN 145/99 140/94 140/94
COMMENT: Solar activity on UT day 02-Aug was at the R0 level,
with several low level C-class flares observed. There are currently
eight numbered sunspot regions visible on the solar disk. AR4168
(N06E30, beta-gamma) recently appeared in the northeast quadrant
and is the most magnetically complex region on the disk. This
region has shown rapid spot growth since appearing on the disk.
AR4167 (N11W36, beta) has exhibited spot development over the
UT day, particularly in its leader and intermediate spots. All
other sunspot regions are either stable or in decay. Solar activity
is expected to be at R0-R1 levels over 03-05 Aug. S0 solar proton
conditions were observed on UT day 02-Aug. S0 solar proton conditions
are expected over 03-05 Aug. No Earth-directed CMEs have been
observed. The solar wind speed on UT day 02-Aug was mostly stable,
ranging from 440 to 520 km/s and is currently near 475 km/s.
The peak total interplanetary magnetic field strength (IMF, Bt)
was 7 nT and the north-south IMF component (Bz) range was -6
to +7 nT. The solar wind speed is expected to decline toward
background levels on 03-Aug. A mild increase in the solar wind
is possible on 04-Aug due to a narrow equatorial coronal hole.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 02 Aug: G0
Estimated Indices 02 Aug : A K
Australian Region 5 22111222
Cocos Island 4 12110122
Darwin 7 22211232
Townsville 5 22111222
Learmonth 9 22222233
Alice Springs 5 22111222
Gingin 7 22111233
Canberra 5 22101222
Kennaook Cape Grim 5 22201222
Hobart 5 22101222
Estimated Antarctic Regional K Indices 02 Aug :
Macquarie Island 2 12101101
Casey 12 34312223
Mawson 26 55321226
Observed Regional daily pc3 Indices 02 Aug :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 8 (Quiet)
Canberra 11 (Quiet)
Hobart 9 (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 02 Aug : A
Fredericksburg 8
Planetary 8
Observed AFr/Ap Indices 01 Aug : A K
Fredericksburg 13
Planetary 13 ---- ----
2B. MAGNETIC FORECAST
Date Ap Conditions
03 Aug 8 G0
04 Aug 8 G0
05 Aug 6 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 02-Aug. Mostly G0 geomagnetic conditions were
observed in the Antarctic region, with an isolated period of
G1 observed at Mawson. G0 geomagnetic conditions are expected
over 03-05 Aug.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
02 Aug Normal Normal Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
03 Aug Normal Normal Normal-fair
04 Aug Normal Normal Normal-fair
05 Aug Normal Normal Normal
COMMENT: HF radio propagation conditions on UT day 02-Aug were
mostly normal, with periods of fair conditions at high latitudes.
HF radio propagation conditions are expected to be mostly normal
over 03-05 Aug. Shortwave fadeouts are possible.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
02 Aug 99
Observed Australian Regional MUFs
Cocos Island Region:
Near predicted monthly values during local day.
Enhanced by 15% 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):
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
03 Aug 90 Near predicted monthly values
04 Aug 90 Near predicted monthly values
05 Aug 90 Near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region on UT day 02-Aug were mostly near predicted monthly values.
MUFs were 15% depressed during local night hours in northern
Australia. Spread F was observed at Hobart during local night
hours. MUFs are expected to be near predicted monthly values
over 03-05 Aug. Shortwave fadeouts are possible.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 01 Aug
Daily Proton Fluence >1 MeV: 5.8E+05
Daily Proton Fluence >10 MeV: 1.7E+04
Daily Electron Fluence >2 MeV: 4.10E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 6%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B9.2
DSCOVR Satellite Solar Wind Day Averaged Data for 01 Aug
Speed: 476 km/sec Density: 3.0 p/cc Temp: 127000 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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