[Ips-dsgr] ASWFC Daily Report - 23 October 25 issued 2330 UT on 23 Oct 2025 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Fri Oct 24 10:30:49 AEDT 2025
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/23 OCTOBER 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 23 OCTOBER AND FORECAST FOR 24 OCTOBER - 26 OCTOBER
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 23 Oct: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 23 Oct: 130/84
1B. SOLAR FORECAST
24 Oct 25 Oct 26 Oct
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 130/84 135/89 135/89
COMMENT: Solar activity on UT day 23-Oct was at the R0 level,
with no significant flaring activity. There are currently seven
numbered sunspot regions visible on the solar disk. Region AR4262
(S14E11, alpha) continues to show evolution in its shape, extending
itself East-West. Regions AR4267(N2W80, alpha) and AR4266(N15W54,
beta), in the North-West are new, but show no immediate concern.
All other sunspot regions are either stable or in decay. Solar
activity is expected to be at the R0 level over 24-26
Oct. S0 solar proton conditions were observed on UT day 23-Oct.
Levels remain elevated from background due to farside CME activity
over the past several days. S0, chance S1 solar proton conditions
are expected over 24-26 Oct, due to recent farside CME activity
and already elevated conditions. No Earth-directed CMEs have
been observed. Multiple CMEs were observed, directed to the North-West,
visible in LASCO and STEREO-A coronagraph imagery. These CMEs
are considered farside events and therefore not geoeffective.
The unanalysed CME noted in yesterdays report was assessed to
be a farside event and not geoeffective. The solar wind speed
on UT day 23-Oct was largely stable, but showed a step increase,
beginning at approximately 23/1130UT. The speed ranged from 386
to 488 km/s and is currently near 474 km/s. The peak total interplanetary
magnetic field strength (IMF, Bt) was 10 nT and the North-South
IMF component (Bz) range was -7 to +7 nT. The interplanetary
magnetic field strength has remained stable. The solar wind speed
is expected to decline to background levels, over 24-26 Oct,
due to waning coronal hole high speed wind stream effects.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 23 Oct: G0
Estimated Indices 23 Oct : A K
Australian Region 3 21001122
Cocos Island 2 11100121
Darwin 4 21001123
Townsville 4 21001123
Learmonth 5 22101222
Alice Springs 3 21001122
Gingin 4 22101122
Canberra 3 10001113
Kennaook Cape Grim 3 11001122
Hobart 2 11001112
Estimated Antarctic Regional K Indices 23 Oct :
Macquarie Island 2 11001112
Casey 13 43323223
Mawson 12 43022224
Observed Regional daily pc3 Indices 23 Oct :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 0 (Quiet)
Canberra 8 (Quiet)
Hobart 16 (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 23 Oct : A
Fredericksburg 5
Planetary 5
Observed AFr/Ap Indices 22 Oct : A K
Fredericksburg 3
Planetary 4 1111 1112
2B. MAGNETIC FORECAST
Date Ap Conditions
24 Oct 6 G0
25 Oct 9 G0
26 Oct 7 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 23-Oct. G0 conditions were observed in the Antarctic
region. G0 geomagnetic conditions are expected over 24-26 Oct.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
23 Oct Normal Normal Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
24 Oct Normal Normal Normal
25 Oct Normal Normal Normal
26 Oct Normal Normal Normal
COMMENT: HF radio propagation conditions on UT day 23-Oct were
normal. Normal HF conditions are expected over 24-26 Oct.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
23 Oct 116
Observed Australian Regional MUFs
Cocos Island Region:
Near predicted monthly values during local day.
Enhanced by 25% during local night.
Niue Island Region:
Near predicted monthly values.
Northern Australian Region:
Enhanced by 20% during local day.
Enhanced by 20% during local night.
Southern Australian Region:
Mostly near predicted monthly values.
Enhanced by 20% after local dawn.
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
24 Oct 120 Near to 15% above predicted monthly values
25 Oct 120 Near to 15% above predicted monthly values
26 Oct 120 Near to 15% above predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region on UT day 23-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 24-26 Oct.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 22 Oct
Daily Proton Fluence >1 MeV: 3.1E+05
Daily Proton Fluence >10 MeV: 1.3E+05
Daily Electron Fluence >2 MeV: 1.80E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 3%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B8.8
DSCOVR Satellite Solar Wind Day Averaged Data for 22 Oct
Speed: 417 km/sec Density: 2.8 p/cc Temp: 70000 K Bz: 2 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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