[Ips-dsgr] ASWFC Daily Report - 25 February 26 issued 2330 UT on 25 Feb 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Thu Feb 26 10:30:49 AEDT 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/25 FEBRUARY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 25 FEBRUARY AND FORECAST FOR 26 FEBRUARY - 28 FEBRUARY
STATUS INDICATORS SOL:** YELLOW ** MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 25 Feb: R1
Flares Max Fadeout Freq. Sectors
M2.4 1559UT possible lower South American/
Atlantic
Observed 10.7 cm flux/Equivalent Sunspot Number for 25 Feb: 125/78
1B. SOLAR FORECAST
26 Feb 27 Feb 28 Feb
Activity R0-R1 R0-R1 R0-R1
Fadeouts Possible Possible Possible
10.7cm/SSN 130/84 132/86 132/86
COMMENT: Solar activity on UT day 25-Feb was R1, with an isolated
M2.4 flare from a new region rotating on near a latitude of S21.
Another new region has rotated over near N18 but has remained
quiet. Solar activity is expected to be R0-R1 over 16-28 Feb.
Minor filament movement near S05W25 may have been associated
with a slow and small Earth-directed CME, although this does
not show up well in imagery. A weak impact may be observed late
on 28-Feb. No other Earth directed CMEs were observed.
S0 solar radiation storm conditions were observed on UT day 25-Feb.
S0 solar radiation storm conditions are expected over 26-28 Feb.
On UT day 25-Feb the solar wind environment was mostly near background
levels. The solar wind speed was generally near 550 km/s for the
whole day. The peak total interplanetary field strength (IMF,
Bt) was 6 nT and the north-south IMF component range (Bz) was
+5 to -5 nT. The solar wind is expected to be mildly disturbed
due to continuing but declining coronal hole effects on 26-Feb.
A further small enhancement may be observed late on 28-Feb.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 25 Feb: G0
Estimated Indices 25 Feb : A K
Australian Region 12 32323323
Cocos Island 9 22223322
Darwin 11 32223323
Townsville 11 22333223
Learmonth 12 32323323
Alice Springs 9 22323213
Gingin 15 32324324
Canberra 12 22333323
Kennaook Cape Grim 14 33333323
Hobart 15 33433323
Estimated Antarctic Regional K Indices 25 Feb :
Macquarie Island 14 23244322
Casey 29 45633324
Mawson 37 55433356
Observed Regional daily pc3 Indices 25 Feb :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 12 (Quiet)
Canberra 15 (Quiet)
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 25 Feb : A
Fredericksburg 10
Planetary 13
Observed AFr/Ap Indices 24 Feb : A K
Fredericksburg 12
Planetary 14 3432 3233
2B. MAGNETIC FORECAST
Date Ap Conditions
26 Feb 8 G0
27 Feb 5 G0
28 Feb 14 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 25-Feb. G0-G2 geomagnetic conditions were observed
in the Antarctic region. G0 geomagnetic conditions are expected
over 26-28 Feb.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
25 Feb Normal-fair Normal-fair Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
26 Feb Normal-fair Normal Normal-fair
27 Feb Normal Normal Normal-fair
28 Feb Normal-fair Normal Normal-fair
COMMENT: HF propagation conditions were mildly degraded, particularly
in the southern hemisphere in the first half of the day. Conditions
were mostly normal in the second half. HF propagation conditions
are generally expected to be normal over 26-28 Feb with mild
degradations during local night hours.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
25 Feb 95
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 15% during local day.
Near predicted monthly values during local night.
Niue Island Region:
Enhanced by 15% during local day.
Near predicted monthly values during local night.
Northern Australian Region:
Near predicted monthly values during local day.
Enhanced by 20% during local night.
Southern Australian Region:
Depressed 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
Jan 96
Feb 88
Mar 87
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
26 Feb 90 Near predicted monthly values
27 Feb 90 Near predicted monthly values
28 Feb 95 Near predicted monthly values
COMMENT: ASWFC SWF HF Communications Warning 26 was issued on
25 February and is current for 26-27 Feb. Maximum usable frequencies
(MUFs) in the Australian region were depressed by 15% to enhanced
by 20%. Sporadic-E was observed in Townsvile, Niue Island and
Brisbane during local night hours. Mild spread-F was observed
in Hobart during local night hours. Scintillation was observed
in Weipa from 1201 UT. MUFs are expected to be mostly near predicted
values over 26-28 Feb.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 24 Feb
Daily Proton Fluence >1 MeV: 2.4E+06
Daily Proton Fluence >10 MeV: 2.1E+04
Daily Electron Fluence >2 MeV: 4.40E+08 (moderate fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability:22%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B7.6
DSCOVR Satellite Solar Wind Day Averaged Data for 24 Feb
Speed: 593 km/sec Density: 1.5 p/cc Temp: 154000 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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