[Ips-dsgr] ASWFC Daily Report - 19 February 26 issued 2330 UT on 19 Feb 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Fri Feb 20 10:30:45 AEDT 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/19 FEBRUARY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 19 FEBRUARY AND FORECAST FOR 20 FEBRUARY - 22 FEBRUARY
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 19 Feb: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 19 Feb: 116/68
1B. SOLAR FORECAST
20 Feb 21 Feb 22 Feb
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 120/72 115/66 115/66
COMMENT: Solar flare activity on UT day 19-Feb was at the R0
level, with the largest flare a C2.0 flare at 19/0718UT. There
are currently three numbered sunspot regions visible on the solar
disk. All sunspot regions are small, magnetically simple and
either stable or in decay. Solar flare activity is expected to
be at the R0 level over 20-22 Feb. S0 solar radiation storm conditions
were observed on UT day 19-Feb. S0 solar radiation storm conditions
are expected over 20-22 Feb. No Earth-directed coronal mass ejections
(CMEs) have been observed. A filament lift off is visible from
19/1619UT at around S30E80 in SDO and GOES SUVI imagery. No associated
CME is currently visible in coronagraph imagery. The solar wind
speed on UT day 19-Feb increased slightly, mostly ranging between
440 and 570 km/s and is currently near 500 km/s. The peak total
interplanetary magnetic field strength (IMF, Bt) was 8 nT and
the north-south IMF component (Bz) range was -5 to +6 nT. The
solar wind is expected to decline towards background levels over
20-21 Feb. An increase in wind speed is expected late on 22-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 19 Feb: G0
Estimated Indices 19 Feb : A K
Australian Region 6 22213211
Cocos Island 4 21212200
Darwin 8 32213212
Townsville 6 22222211
Learmonth 6 22213211
Alice Springs 7 22213212
Gingin 7 32213211
Canberra 6 22223201
Kennaook Cape Grim 6 22222211
Hobart 7 22223211
Estimated Antarctic Regional K Indices 19 Feb :
Macquarie Island 9 12234211
Casey 17 44523212
Mawson 21 54433224
Observed Regional daily pc3 Indices 19 Feb :
Darwin 2 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 31 (Quiet to unsettled)
Canberra 25 (Quiet to unsettled)
Hobart 26 (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 19 Feb : A
Fredericksburg 12
Planetary 14
Observed AFr/Ap Indices 18 Feb : A K
Fredericksburg 7
Planetary 10 2322 2222
2B. MAGNETIC FORECAST
Date Ap Conditions
20 Feb 10 G0
21 Feb 8 G0
22 Feb 12 G0, chance of G1
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 19-Feb. Mostly G1 geomagnetic conditions were
observed in the Antarctic region. G0 planetary geomagnetic conditions
are expected over 20-21 Feb. G0 conditions, with a chance of
G1 are expected on 22-Feb due to anticipated coronal hole high
speed wind stream effects in the second half of the UT day.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
19 Feb Normal Normal-fair Fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
20 Feb Normal Normal Normal-fair
21 Feb Normal Normal Normal-fair
22 Feb Normal Normal-fair Fair
COMMENT: Global ionospheric conditions were mostly normal on
UT day 19-Feb, with fair conditions observed at middle and high
latitudes in the first half of the UT day, primarily in the southern
hemisphere. Mostly normal HF conditions are expected over 20-22
Feb.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
19 Feb 95
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 15% during local day.
Enhanced by 25% during local night.
Niue Island Region:
Near predicted monthly values during local day.
Depressed by 15% during local night.
Northern Australian Region:
Near predicted monthly values.
Southern Australian Region:
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
20 Feb 98 Near predicted monthly values
21 Feb 98 Near predicted monthly values
22 Feb 90 Near predicted monthly values
COMMENT: Maximum Usable Frequencies (MUFs) on UT day 19-Feb in
the Australian region were near predicted monthly values. Spread
F was observed at Hobart during local night hours. MUFs are expected
to be near predicted monthly values over 20-22 Feb.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 18 Feb
Daily Proton Fluence >1 MeV: 3.4E+06
Daily Proton Fluence >10 MeV: 1.6E+04
Daily Electron Fluence >2 MeV: 1.50E+08 (moderate fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability:13%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B4.0
DSCOVR Satellite Solar Wind Day Averaged Data for 18 Feb
Speed: 510 km/sec Density: 2.1 p/cc Temp: 112000 K Bz: 0 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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