[Ips-dsgr] ASWFC Daily Report - 24 February 26 issued 2330 UT on 24 Feb 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Wed Feb 25 10:30:44 AEDT 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/24 FEBRUARY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 24 FEBRUARY AND FORECAST FOR 25 FEBRUARY - 27 FEBRUARY
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 24 Feb: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 24 Feb: 120/72
1B. SOLAR FORECAST
25 Feb 26 Feb 27 Feb
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 120/72 122/75 125/78
COMMENT: Solar flare activity was at the R0 level during UT day
24-Feb, with several C-class flares observed, the largest of
which was a C4.5 flare at 24/1710UT. The Sun is currently spotless,
with no active regions on the visible disk. There is currently
no sign of a return of AR4366 which produced many M and X-class
flares when last on the solar disk. Solar flare activity is expected
to remain at the R0 level through 25-27 Feb. S0 solar radiation
storm conditions were elevated, but below the S1 level on 24-Feb.
S0 conditions are forecast over 25-27 Feb. No geoeffective Coronal
Mass Ejections (CMEs) were observed over the past UT day. A narrow
southwest directed CME was observed from 24/1036UT. This event
is associated with coronal movement behind the southeast limb
visible in GOES SUVI from 24/0917UT and is considered farside
and not geoeffective. The solar wind speed declined slightly
over the UT day 24-Feb, mostly ranging between 650 and 510 km/s.
The wind speed is currently at around 570 km/s. The interplanetary
magnetic field strength (IMF, Bt) peaked at 5 nT. The north-south
component (Bz) of the magnetic field ranged between -5 and +5
nT. The solar wind is expected to continue to decline towards
background levels over 25-27 Feb as coronal hole high speed wind
stream effects wane.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 24 Feb: G0
Estimated Indices 24 Feb : A K
Australian Region 10 23233222
Cocos Island 6 22222221
Darwin 10 33223222
Townsville 13 24-33232
Learmonth 12 33233232
Alice Springs 10 33223222
Gingin 12 33233232
Canberra 10 23233222
Kennaook Cape Grim 11 23333222
Hobart 11 23333222
Estimated Antarctic Regional K Indices 24 Feb :
Macquarie Island 20 24255232
Casey 24 45543223
Mawson 37 35543365
Observed Regional daily pc3 Indices 24 Feb :
Darwin 2 (Quiet)
Townsville 0 (Quiet)
Learmonth 2 (Quiet)
Alice Springs 0 (Quiet)
Gingin 21 (Quiet to unsettled)
Canberra 48 (Unsettled)
Hobart 43 (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 Feb : A
Fredericksburg 13
Planetary 16
Observed AFr/Ap Indices 23 Feb : A K
Fredericksburg 17
Planetary 23 4534 3244
2B. MAGNETIC FORECAST
Date Ap Conditions
25 Feb 11 G0
26 Feb 8 G0
27 Feb 5 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on 24-Feb. Mostly G1 conditions were observed in the Antarctic
region, with a period of G2 conditions observed at Mawson. G0
conditions are expected over 25-27 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
24 Feb Normal Normal-fair Fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
25 Feb Normal Normal Normal-fair
26 Feb Normal Normal Normal-fair
27 Feb Normal Normal Normal
COMMENT: Mostly poor propagation conditions were observed in
the southern hemisphere at all latitudes over the first half
of the UT day 24-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 improve towards normal at all latitudes over
25-27 Feb.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
24 Feb 77
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 15% during local day.
Enhanced by 15% during local night.
Niue Island Region:
Enhanced by 20% during local day.
Enhanced by 25% during local night.
Northern Australian Region:
Near predicted monthly values.
Southern Australian Region:
Depressed by 15% during local day.
Depressed by 15% 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
25 Feb 80 Near predicted monthly values
26 Feb 88 Near predicted monthly values
27 Feb 88 Near predicted monthly values
COMMENT: Maximum Usable Frequencies (MUFs) were depressed by
up to 15% in the southern Australian region. Conditions were
near predicted monthly values in the northern Australian region.
Strong sporadic E was observed during local night hours across
the Australian region. Spread F was observed at Hobart, also
during local night hours. Conditions are expected to improve
towards predicted monthly values over 25-27 Feb, with minor depressions
possible in the southern Australian region.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 23 Feb
Daily Proton Fluence >1 MeV: 4.0E+06
Daily Proton Fluence >10 MeV: 1.7E+04
Daily Electron Fluence >2 MeV: 1.40E+08 (moderate fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability:13%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B2.9
DSCOVR Satellite Solar Wind Day Averaged Data for 23 Feb
Speed: 674 km/sec Density: 1.6 p/cc Temp: 213000 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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