[Ips-dsgr] ASWFC Daily Report - 21 February 26 issued 2330 UT on 21 Feb 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sun Feb 22 10:30:49 AEDT 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/21 FEBRUARY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 21 FEBRUARY AND FORECAST FOR 22 FEBRUARY - 24 FEBRUARY
STATUS INDICATORS SOL:GREEN MAG:** YELLOW ** ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 21 Feb: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 21 Feb: 110/60
1B. SOLAR FORECAST
22 Feb 23 Feb 24 Feb
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 112/63 125/78 125/78
COMMENT: Solar flare activity on UT day 21-Feb was at the R0
level, with no significant flaring activity. There is currently
one numbered sunspot regions visible on the solar disk which
is small, magnetically simple and in decay. Solar flare activity
is expected to be at the R0 level over 22-24 Feb. S0 solar radiation
storm conditions were observed on UT day 21-Feb. S0 solar radiation
storm conditions are expected over 22-24 Feb. No Earth-directed
coronal mass ejections (CMEs) have been observed. The solar wind
speed on UT day 21-Feb increased slightly, mostly ranging between
450 and 560 km/s and is currently near 550 km/s. The peak total
interplanetary magnetic field strength (IMF, Bt) was 15 nT and
the north-south IMF component (Bz) range was -10 to +12 nT. The
solar wind is expected to remain steady on 22-Feb and early 23-Feb
then start increasing late 23-Feb and 24-Feb due to high speed
wind stream effects from an equatorial coronal hole rotating
towards a geoeffective location.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 21 Feb: G0
Estimated Indices 21 Feb : A K
Australian Region 14 33332234
Cocos Island 11 33322223
Darwin 14 43332233
Townsville 16 44332224
Learmonth 16 43332234
Alice Springs 12 33332223
Gingin 13 43322233
Canberra 13 33322234
Kennaook Cape Grim 14 33332234
Hobart 13 33322134
Estimated Antarctic Regional K Indices 21 Feb :
Macquarie Island 9 33210124
Casey 27 56442133
Mawson 21 54322235
Observed Regional daily pc3 Indices 21 Feb :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 19 (Quiet)
Canberra 5 (Quiet)
Hobart 17 (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 21 Feb : A
Fredericksburg 11
Planetary 13
Observed AFr/Ap Indices 20 Feb : A K
Fredericksburg 6
Planetary 12 1322 3234
2B. MAGNETIC FORECAST
Date Ap Conditions
22 Feb 15 G0, chance of G1
23 Feb 21 G0-G1
24 Feb 22 G1, chance of G2
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 21-Feb. Mostly G0 geomagnetic conditions were
observed in the Antarctic region, with isolated periods of G1
observed at Mawson and G2 observed at Casey. G0, chance of G1
planetary geomagnetic conditions on 22 Feb due to a mild increase
in geomagnetic activity from a southern hemisphere coronal hole
winds stream glancing impact. G0-G1 conditions forecast on 23-Feb
due to a coronal hole moving into a geoeffective position late
in the UT day and G1, chance of G2 on 24-Feb due to coronal hole
high speed wind stream effects.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
21 Feb Normal Normal Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
22 Feb Normal Normal Normal-fair
23 Feb Normal Normal-fair Fair
24 Feb Normal Normal-fair Fair
COMMENT: Global ionospheric conditions were mostly normal on
UT day 21-Feb, with fair conditions observed at high latitudes
at times. Mostly normal HF conditions are expected over 22-Feb
becoming normal to fair on 23-24 Feb due to increased geomagnetic
conditions from coronal hole high speed wind stream effects.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
21 Feb 95
Observed Australian Regional MUFs
Cocos Island Region:
Mostly near predicted monthly values.
Niue Island Region:
Enhanced by 30% during local day.
Near predicted monthly values during local night.
Northern Australian Region:
Near predicted monthly values.
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
22 Feb 95 Near predicted monthly values
23 Feb 90 Near predicted monthly values
24 Feb 90 Near predicted monthly values
COMMENT: Maximum Usable Frequencies (MUFs) on UT day 21-Feb in
the Australian region were near predicted monthly values with
up to 30% enhancement at low latitudes. Spread F was observed
at Hobart and Canberra during local night hours. MUFs are expected
to be near predicted monthly values on 22 Feb with chance of
slightly depressed values on 23-24 Feb due to the increased geomagnetic
conditions from the Coronal hole high speed wind stream effects.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 20 Feb
Daily Proton Fluence >1 MeV: 4.1E+06
Daily Proton Fluence >10 MeV: 1.5E+04
Daily Electron Fluence >2 MeV: 1.90E+08 (moderate fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability:15%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B3.6
DSCOVR Satellite Solar Wind Day Averaged Data for 20 Feb
Speed: 476 km/sec Density: 3.0 p/cc Temp: 108000 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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