[Ips-dsgr] ASWFC Daily Report - 11 February 26 issued 2330 UT on 11 Feb 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Thu Feb 12 10:30:53 AEDT 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/11 FEBRUARY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 11 FEBRUARY AND FORECAST FOR 12 FEBRUARY - 14 FEBRUARY
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 11 Feb: R1
Flares Max Fadeout Freq. Sectors
M1.2 0009UT possible lower West Pacific
M1.1 0044UT possible lower West Pacific
M1.4 1312UT possible lower European
Observed 10.7 cm flux/Equivalent Sunspot Number for 11 Feb: 129/82
1B. SOLAR FORECAST
12 Feb 13 Feb 14 Feb
Activity R0, chance R1 R0, chance R1 R0, chance R1
Fadeouts None expected None expected None expected
10.7cm/SSN 130/84 120/72 115/66
COMMENT: Solar flare activity on UT day 11-Feb was at the R1
level due to three M-class flares, the largest of which was an
M1.4 flare at 11/1312UT. All M-class flares were produced by
AR4366 (N16W94, beta-gamma) which has now completely rotated
over the western limb. There are currently six numbered sunspot
regions visible on the solar disk. AR4374 (N11E49, beta) is the
largest region on the disk and is stable. Newly numbered AR4375
(N17E75, alpha) recently rotated over the eastern limb and appears
stable. All other sunspot regions are either stable or in decay.
Solar flare activity is expected to be at the R0 level over 12-14
Feb, with a chance of R1. S0 solar proton conditions were observed
on UT day 11-Feb. S0 solar proton conditions are expected over
12-14 Feb. No Earth-directed coronal mass ejections (CMEs) have
been observed. The solar wind speed on UT day 11-Feb mildly declined,
ranging from 410 to 520 km/s and is currently near 435 km/s.
The peak total interplanetary magnetic field strength (IMF, Bt)
was 8 nT and the north-south IMF component (Bz) range was -7
to +7 nT. The solar wind speed is expected to remain near background
levels over 12-14 Feb.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 11 Feb: G0
Estimated Indices 11 Feb : A K
Australian Region 12 32332332
Cocos Island 9 32222331
Darwin 14 33332333
Townsville 13 32332333
Learmonth 14 33333332
Alice Springs 11 32322332
Gingin 12 32323332
Canberra 13 32332333
Kennaook Cape Grim 13 33332332
Hobart 14 33332333
Estimated Antarctic Regional K Indices 11 Feb :
Macquarie Island 21 33344443
Mawson 43 64434366
Observed Regional daily pc3 Indices 11 Feb :
Darwin 8 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 2 (Quiet)
Canberra 4 (Quiet)
Hobart 13 (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 11 Feb : A
Fredericksburg 13
Planetary 14
Observed AFr/Ap Indices 10 Feb : A K
Fredericksburg 8
Planetary 10 1113 2234
2B. MAGNETIC FORECAST
Date Ap Conditions
12 Feb 8 G0
13 Feb 6 G0
14 Feb 6 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 11-Feb. G2 geomagnetic conditions were observed
in the Antarctic region. G0 geomagnetic conditions are expected
over 12-14 Feb.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
11 Feb Normal Normal-fair Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
12 Feb Normal Normal Normal-fair
13 Feb Normal Normal Normal
14 Feb Normal Normal Normal
COMMENT: Global ionospheric conditions were mostly normal on
UT day 11-Feb, with fair conditions observed at mid and high
latitudes. Mostly normal conditions are expected over 12-14 Feb.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
11 Feb 81
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 20% 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.
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
12 Feb 85 Near predicted monthly values
13 Feb 85 Near predicted monthly values
14 Feb 85 Near predicted monthly values
COMMENT: ASWFC SWF HF Communications Warning 21 was issued on
11 February and is current for 11-13 Feb. Maximum Usable Frequencies
(MUFs) in the Australian region were mostly near predicted monthly
values on UT day 11-Feb. Southern Australian MUFs are depressed
by 25% after local dawn. Sporadic E was observed at Perth during
local night hours. MUFs are expected to be near predicted monthly
values over 12-14 Feb.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 10 Feb
Daily Proton Fluence >1 MeV: 1.0E+06
Daily Proton Fluence >10 MeV: 1.5E+04
Daily Electron Fluence >2 MeV: 4.80E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 7%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: C1.1
DSCOVR Satellite Solar Wind Day Averaged Data for 10 Feb
Speed: 441 km/sec Density: 3.1 p/cc Temp: 144000 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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