[Ips-dsgr] ASWFC Daily Report - 26 February 26 issued 2330 UT on 26 Feb 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Fri Feb 27 10:30:50 AEDT 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/26 FEBRUARY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 26 FEBRUARY AND FORECAST FOR 27 FEBRUARY - 01 MARCH
STATUS INDICATORS SOL:** YELLOW ** MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 26 Feb: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 26 Feb: 130/84
1B. SOLAR FORECAST
27 Feb 28 Feb 01 Mar
Activity R0-R1 R0-R1 R0-R1
Fadeouts Possible Possible Possible
10.7cm/SSN 132/86 132/86 132/86
COMMENT: Solar activity on UT day 26-Feb was R0. There are currently
two numbered sunspots on the solar disk. Active region (AR) 4378
(N16E56, beta) is stable, and AR 4379 (S17E62, beta) appears
stable although is not yet well visible. Solar activity is expected
to be R0-R1 over 27-28 Feb and 1-Mar.
No Earth directed CMEs were observed on UT day 26-Feb.
S0 solar radiation storm conditions were observed on UT day 26-Feb.
S0 solar radiation storm conditions are expected over 27-29 Feb.
The solar wind environment on UT day 26-Feb was mostly near background levels.
The solar wind speed fluctuated from near 500 km/s for most of the day.
The peak total interplanetary field strength (IMF, Bt) was 6 nT and
the north-south IMF component range (Bz) was +3 to -6 nT. The
solar wind is expected to continue slowing down from the recent
coronal hole on 27-Feb, before a small disturbance is expected
from a weak CME late on 28-Feb. The solar wind speed is expected
to then return to background levels by the end of 1-Mar.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 26 Feb: G0
Estimated Indices 26 Feb : A K
Australian Region 8 22322222
Cocos Island 7 32321121
Darwin 8 23321222
Townsville 9 23322222
Learmonth 11 32322332
Alice Springs 7 22321222
Gingin 10 32323231
Canberra 9 22332222
Kennaook Cape Grim 10 23332222
Hobart 10 23332222
Estimated Antarctic Regional K Indices 26 Feb :
Macquarie Island 24 34554322
Casey 30 55633233
Mawson 58 55543483
Observed Regional daily pc3 Indices 26 Feb :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 4 (Quiet)
Canberra 4 (Quiet)
Hobart 2 (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 26 Feb : A
Fredericksburg 15
Planetary 17
Observed AFr/Ap Indices 25 Feb : A K
Fredericksburg 11
Planetary 14 4223 3324
2B. MAGNETIC FORECAST
Date Ap Conditions
27 Feb 5 G0
28 Feb 14 G0
01 Mar 10 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 26-Feb. Mostly G0 geomagnetic conditions were
observed in the Antarctic region, although an isolated period
of G4 was observed at the Mawson station. G0 geomagnetic conditions
are expected over 27-28 Feb and 1-Mar. A weak CME impact is expected
late on 28-Feb but this is not expected to cause any activity
above G0.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
26 Feb Normal Normal Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
27 Feb Normal Normal Normal-fair
28 Feb Normal-fair Normal Normal-fair
01 Mar Normal Normal Normal-fair
COMMENT: HF radio propagation conditions on UT day 26-Feb were
mostly normal, though some mild degradations were observed in
the southern hemisphere throughout the day. HF radio propagation
conditions are expected to be mostly normal over 27-28 Feb and
1-Mar.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
26 Feb 108
Observed Australian Regional MUFs
Cocos Island Region:
Mostly near predicted monthly values.
Enhanced by 20% after local dawn.
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 35% during local night.
Southern Australian Region:
Mostly near predicted monthly values.
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
27 Feb 100 Near predicted monthly values
28 Feb 110 Near predicted monthly values
01 Mar 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 on UT day 26-Feb were near predicted
values to enhanced by 35%. Sporadic-E was observed in Hobart
during local night hours. MUFs are expected to be near predicted
values over 27-28 Feb and 1-Mar.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 25 Feb
Daily Proton Fluence >1 MeV: 8.0E+05
Daily Proton Fluence >10 MeV: 1.8E+04
Daily Electron Fluence >2 MeV: 3.90E+08 (moderate fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability:21%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B8.8
DSCOVR Satellite Solar Wind Day Averaged Data for 25 Feb
Speed: 545 km/sec Density: 1.3 p/cc Temp: 156000 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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