[Ips-dsgr] ASWFC Daily Report - 24 October 25 issued 2330 UT on 24 Oct 2025 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sat Oct 25 10:30:58 AEDT 2025
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/24 OCTOBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 24 OCTOBER AND FORECAST FOR 25 OCTOBER - 27 OCTOBER
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 24 Oct: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 24 Oct: 134/88
1B. SOLAR FORECAST
25 Oct 26 Oct 27 Oct
Activity R0, chance R1 R0, chance R1 R0, chance R1
Fadeouts None expected None expected None expected
10.7cm/SSN 140/94 140/94 135/89
COMMENT: Solar activity on UT day 24-Oct was at the R0 level,
with no significant flaring activity. There are currently seven
numbered sunspot regions visible on the solar disk. AR4266 (N15W35,
beta) is the most magnetically complex region on the disk and
has exhibited spot development over the UT day. AR4262 (S14W15,
beta) has shown growth in its trailer spots. AR4261 (S07E15,
beta) has shown slight growth in its trailer spot. All other
sunspot regions are either stable or in decay. Solar activity
is expected to be at the R0 level over 25-27 Oct, with a chance
of R1. S0 solar proton conditions were observed on UT day 24-Oct.
S0 solar proton conditions are expected over 25-27 Oct. No Earth-directed
CMEs have been observed. A small filament eruption was observed,
visible in H-alpha imagery from 24/1217UT centred near S12E42.
No significant CME was observed in association with this eruption.
A second filament eruption was observed, visible in H-alpha imagery
from 24/1431UT centred near S02E10. Similarly, no significant
CME was observed associated with this filament eruption. The
solar wind speed on UT day 24-Oct was mostly stable, ranging
from 485 to 530 km/s and is currently near 500 km/s. The peak
total interplanetary magnetic field strength (IMF, Bt) was 8
nT and the north-south IMF component (Bz) range was -6 to +8
nT. The solar wind speed is expected to decline toward background
levels over 25-27 Oct.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 24 Oct: G0
Estimated Indices 24 Oct : A K
Australian Region 9 23222232
Cocos Island 6 22221230
Darwin 9 23222223
Townsville 10 33222232
Learmonth 9 23222232
Alice Springs 8 22222232
Gingin 9 32222232
Canberra 7 23212122
Kennaook Cape Grim 9 23322222
Hobart 8 23312222
Estimated Antarctic Regional K Indices 24 Oct :
Macquarie Island 8 23223121
Casey 25 55533232
Mawson 19 44433242
Observed Regional daily pc3 Indices 24 Oct :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 28 (Quiet to unsettled)
Canberra 24 (Quiet to unsettled)
Hobart 23 (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 24 Oct : A
Fredericksburg 8
Planetary 10
Observed AFr/Ap Indices 23 Oct : A K
Fredericksburg 4
Planetary 6 2101 1122
2B. MAGNETIC FORECAST
Date Ap Conditions
25 Oct 9 G0
26 Oct 7 G0
27 Oct 6 G0
COMMENT: G0 geomagnetic conditions were observed on UT day 24-Oct.
G1 geomagnetic conditions were observed in the Antarctic region.
G0 geomagnetic conditions are expected over 25-27 Oct.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
24 Oct Normal Normal Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
25 Oct Normal Normal Normal-fair
26 Oct Normal Normal Normal
27 Oct Normal Normal Normal
COMMENT: HF radio propagation conditions on UT day 24-Oct were
normal. Normal HF conditions are expected over 25-27 Oct.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
24 Oct 118
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 30% during local day.
Enhanced by 55% during local night.
Niue Island Region:
Near predicted monthly values.
Northern Australian Region:
Enhanced by 15% during local day.
Enhanced by 20% during local night.
Southern Australian Region:
Enhanced by 15% during local day.
Near predicted monthly values during local night.
Antarctic Region (Casey/Davis/Mawson):
Near predicted monthly values over the UT day.
Monthly T index:
Month T index
Sep 109
Oct 89
Nov 89
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
25 Oct 115 Near to 15% above predicted monthly values
26 Oct 115 Near to 15% above predicted monthly values
27 Oct 115 Near to 15% above predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region on UT day 24-Oct were near predicted monthly values to
20% enhanced. Spread F was observed at Hobart during local night
hours. MUFs are expected to be near predicted monthly values
to 15% enhanced over 25-27 Oct.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 23 Oct
Daily Proton Fluence >1 MeV: 3.1E+05
Daily Proton Fluence >10 MeV: 5.7E+04
Daily Electron Fluence >2 MeV: 2.80E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 4%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B6.4
DSCOVR Satellite Solar Wind Day Averaged Data for 23 Oct
Speed: 422 km/sec Density: 1.9 p/cc Temp: 97400 K Bz: 3 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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