[Ips-dsgr] ASWFC Daily Report - 01 August 25 issued 2332 UT on 01 Aug 2025 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sat Aug 2 09:32:27 AEST 2025
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/01 AUGUST 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 01 AUGUST AND FORECAST FOR 02 AUGUST - 04 AUGUST
STATUS INDICATORS SOL:GREEN MAG:GREEN 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: 146/100
1B. SOLAR FORECAST
02 Aug 03 Aug 04 Aug
Activity R0, chance R1 R0, chance R1 R0, chance R1
Fadeouts None expected None expected None expected
10.7cm/SSN 145/99 145/99 140/94
COMMENT: Solar activity on UT day 01-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. AR4167
(N11W20, beta) is the largest region on the disk and has shown
spot growth over the UT day. AR4155 (S10W46, beta) has shown
mild growth in its trailer spots. All other sunspot regions are
either stable or in decay. Solar activity is expected to be at
the R0 level over 02-04 Aug, with a chance of R1. S0 solar proton
conditions were observed on UT day 01-Aug. S0 solar proton conditions
are expected over 02-04 Aug. No Earth-directed CMEs have been
observed. The solar wind speed on UT day 01-Aug increased, ranging
from 440 to 515 km/s and is currently near 490 km/s. The peak
total interplanetary magnetic field strength (IMF, Bt) was 7
nT and the north-south IMF component (Bz) range was -7 to +6
nT. The solar wind speed is expected to decline toward background
levels over 02-03 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 01 Aug: G0
Estimated Indices 01 Aug : A K
Australian Region 7 22213122
Cocos Island 7 22212123
Darwin 8 23223122
Townsville 9 23223123
Learmonth 10 22224123
Alice Springs 7 12223122
Gingin 9 22214123
Canberra 6 12213122
Kennaook Cape Grim 8 12214122
Hobart 6 12213122
Estimated Antarctic Regional K Indices 01 Aug :
Macquarie Island 9 12125012
Casey 15 34334123
Mawson 43 34434367
Observed Regional daily pc3 Indices 01 Aug :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 38 (Quiet to unsettled)
Canberra 21 (Quiet to unsettled)
Hobart 40 (Quiet to unsettled)
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 13
Planetary 14
Observed AFr/Ap Indices 31 Jul : A K
Fredericksburg 10
Planetary 11 ---- ----
2B. MAGNETIC FORECAST
Date Ap Conditions
02 Aug 5 G0
03 Aug 5 G0
04 Aug 6 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 01-Aug. Mostly G0-G1 geomagnetic conditions
were observed in the Antarctic region, with isolated periods
of G2 and G3 observed at Mawson. G0 geomagnetic conditions are
expected over 02-04 Aug.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
01 Aug Normal Normal Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
02 Aug Normal Normal Normal
03 Aug Normal Normal Normal
04 Aug Normal Normal Normal
COMMENT: HF radio propagation conditions on UT day 01-Aug were
mostly normal, with periods of fair conditions at high latitudes.
HF radio propagation conditions are expected to be mostly normal
over 02-04 Aug.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
01 Aug 94
Observed Australian Regional MUFs
Cocos Island Region:
Near predicted monthly values during local day.
Depressed by 20% during local night.
Niue Island Region:
Near predicted monthly values.
Northern Australian Region:
Near predicted monthly values.
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
02 Aug 95 Near predicted monthly values
03 Aug 95 Near predicted monthly values
04 Aug 95 Near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region on UT day 01-Aug were near predicted monthly values. Spread
F was observed during local night hours at Hobart. MUFs are expected
to be near predicted monthly values over 02-04 Aug.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 31 Jul
Daily Proton Fluence >1 MeV: 3.5E+05
Daily Proton Fluence >10 MeV: 1.6E+04
Daily Electron Fluence >2 MeV: 3.40E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 5%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B8.1
DSCOVR Satellite Solar Wind Day Averaged Data for 31 Jul
Speed: 434 km/sec Density: 2.5 p/cc Temp: 95700 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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