[Ips-dsgr] ASWFC Daily Report - 23 February 26 issued 2330 UT on 23 Feb 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Tue Feb 24 10:30:51 AEDT 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/23 FEBRUARY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 23 FEBRUARY AND FORECAST FOR 24 FEBRUARY - 26 FEBRUARY
STATUS INDICATORS SOL:GREEN MAG:** YELLOW ** ION: ** YELLOW **
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 23 Feb: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 23 Feb: 108/58
1B. SOLAR FORECAST
24 Feb 25 Feb 26 Feb
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 110/60 115/66 115/66
COMMENT: Solar flare activity was at the R0 level during UT day
23-Feb, with no notable flares observed. The Sun is currently
spotless, with no active regions on the visible disk. Solar flare
activity is expected to remain at the R0 level through 24-26
Feb. S0 solar radiation storm conditions were elevated, but below
the S1 level on 23-Feb. S0 conditions are forecast over 24-26
Feb. No geoeffective Coronal Mass Ejections (CMEs) were observed
over the past UT day. The solar wind speed was elevated over
the UT day 23-Feb, mostly ranging between 600 and 750 km/s. The
wind speed is currently at around 625 km/s. The interplanetary
magnetic field strength (IMF, Bt) peaked at 8 nT. The north-south
component (Bz) of the magnetic field ranged between -7 and +4
nT. The solar wind speed is forecast to remain elevated on 24-Feb
due to ongoing coronal hole high speed wind stream effects. A
decline towards background levels is expected over 25-26 Feb
as coronal hole high speed wind stream effects wane.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 23 Feb: G0
Estimated Indices 23 Feb : A K
Australian Region 14 33233143
Cocos Island 11 23123143
Darwin 12 33233133
Townsville 13 33233242
Learmonth 14 33233243
Alice Springs 11 33233132
Gingin 16 33243243
Canberra 13 33233142
Kennaook Cape Grim 18 33344243
Hobart 17 33244143
Estimated Antarctic Regional K Indices 23 Feb :
Macquarie Island 25 25355233
Casey 26 45534243
Mawson 47 46544266
Observed Regional daily pc3 Indices 23 Feb :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 100 (Minor storm)
Canberra 83 (Minor storm)
Hobart 120 (Major storm)
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 Feb : A
Fredericksburg 17
Planetary 22
Observed AFr/Ap Indices 22 Feb : A K
Fredericksburg 24
Planetary 37 4554 4445
2B. MAGNETIC FORECAST
Date Ap Conditions
24 Feb 18 G0, chance of G1
25 Feb 11 G0
26 Feb 8 G0
COMMENT: ASWFC Geomagnetic Warning 12 was issued on 22 February
and is current for 22-24 Feb. G0 geomagnetic conditions were
observed in the Australian region on 23-Feb. Mostly G1 conditions
were observed in the Antarctic region, with G2 conditions observed
at Mawson. G1 geomagnetic conditions were observed at the planetary
level for one period in the first half of the UT day. G0 conditions,
with a chance of G1 are expected on 24-Feb. G0 conditions are
expected over 25-26 Feb as coronal hole high speed wind stream
effects wane.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
23 Feb Normal Normal-fair Fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
24 Feb Normal Normal-fair Fair
25 Feb Normal Normal Normal-fair
26 Feb Normal Normal Normal-fair
COMMENT: Mostly poor propagation conditions were observed in
the southern hemisphere at all latitudes over the first half
of the UT day 23-Feb. Conditions recovered towards mostly normal
by the end of the UT day. Conditions were mostly normal in the
northern hemisphere throughout the day. Ionospheric conditions
are expected to continue to improve towards normal at all latitudes
over 24-26 Feb, as ongoing geomagnetic activity subsides.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
23 Feb 46
Observed Australian Regional MUFs
Cocos Island Region:
Near predicted monthly values during local day.
Depressed by 20% during local night.
Niue Island Region:
Enhanced by 40% during local day.
Enhanced by 55% during local night.
Northern Australian Region:
Depressed by 40% during local day.
Depressed by 30% during local night.
Southern Australian Region:
Depressed by 20% during local day.
Near predicted monthly values during local night.
Depressed by 25% after local dawn.
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
24 Feb 60 Depressed 15%/near predicted monthly values
25 Feb 80 Near predicted monthly values
26 Feb 88 Near predicted monthly values
COMMENT: ASWFC HF Communications Warning 24 was issued on 22
February and is current for 23-24 Feb. Maximum Usable Frequencies
(MUFs) were depressed for most of the day in the Australian region.
Conditions were depressed by up to 40% in the northern Australian
region and up to 25% in the southern Australian region. Strong
sporadic E was observed during local night hours at Perth and
Hobart. Spread F was observed at Hobart, also during local night
hours. Minor depressions are expected to continue for the first
half of the UT day 24-Feb. Conditions are expected to improve
towards predicted monthly values from the second half of 24-Feb
through to 26-Feb.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 22 Feb
Daily Proton Fluence >1 MeV: 2.2E+06
Daily Proton Fluence >10 MeV: 1.4E+04
Daily Electron Fluence >2 MeV: 2.60E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 4%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B3.0
DSCOVR Satellite Solar Wind Day Averaged Data for 22 Feb
Speed: 615 km/sec Density: 3.2 p/cc Temp: 294000 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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