[Ips-dsgr] ASWFC Daily Report - 09 April 26 issued 2330 UT on 09 Apr 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Fri Apr 10 09:30:43 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/09 APRIL 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 09 APRIL AND FORECAST FOR 10 APRIL - 12 APRIL
STATUS INDICATORS SOL:** YELLOW ** MAG:** YELLOW ** ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 09 Apr: R1
Flares Max Fadeout Freq. Sectors
M1.0 0845UT possible lower Mid East/Indian
Observed 10.7 cm flux/Equivalent Sunspot Number for 09 Apr: 98/45
1B. SOLAR FORECAST
10 Apr 11 Apr 12 Apr
Activity R0, chance of R1 R0 R0
Fadeouts Possible None expected None expected
10.7cm/SSN 95/41 90/34 90/34
COMMENT: Solar flare activity was at the R1 level on UT day 09-Apr,
with an M1.0 flare at 09/0856UT from Active Region (AR) 4409
(N10W90, beta), the largest observed. This region is currently
rotating over the western limb, and is one of three visible regions
on the solar disk. The other two regions are magnetically simple,
and have remained mostly stable over the past UT day. Solar flare
activity is forecast to be at the R0 level, with a chance of
R1 on 10-Apr. This will decline to R0 solar flare activity on
11-12 Apr as AR 4409 continues to rotate beyond the limb. S0
solar proton conditions were observed throughout 09-Apr, with
S0 conditions forecast over 10-12 Apr. No coronal mass ejections
(CMEs) were observed over the past UT day. The solar wind speed
was largely constant throughout 09-Apr, mostly ranging between
350 and 380 km/s. The interplanetary magnetic field strength
(IMF, Bt) peaked at 10 nT during 09-Apr. The north-south component
(Bz) ranged between -8 and +6 nT during this time, including
an extended southward period between 09/1225-1545UT. The solar
wind speed is forecast to increase on 10-Apr due to high speed
wind stream effects from a geoeffective equatorial coronal hole.
These effects are expected to persist through 11-12 Apr.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 09 Apr: G0
Estimated Indices 09 Apr : A K
Australian Region 6 11113222
Cocos Island 3 11112111
Darwin 7 11213223
Townsville 7 1--13222
Learmonth - --------
Alice Springs 6 11203222
Gingin 7 10114222
Canberra 5 01103222
Kennaook Cape Grim 6 01113322
Hobart 6 01113322
Estimated Antarctic Regional K Indices 09 Apr :
Macquarie Island 13 00115441
Casey 11 24323122
Mawson 20 32323454
Observed Regional daily pc3 Indices 09 Apr :
Darwin 0 (Quiet)
Townsville 32 (Quiet to unsettled)
Learmonth NA
Alice Springs 0 (Quiet)
Gingin 0 (Quiet)
Canberra 0 (Quiet)
Hobart 0 (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 09 Apr : A
Fredericksburg 8
Planetary 10
Observed AFr/Ap Indices 08 Apr : A K
Fredericksburg 6
Planetary 7 2212 2222
2B. MAGNETIC FORECAST
Date Ap Conditions
10 Apr 20 G0-G1
11 Apr 18 G0, chance of G1
12 Apr 16 G0, chance of G1
COMMENT: ASWFC Geomagnetic Warning 26 was issued on 7 April and
is current for 9-10 Apr. Geomagnetic conditions were at the G0
level in the Australian region during 09-Apr. G0 conditions were
reported at the planetary level, with G1 geomagnetic intervals
recorded in the Antarctic region. Planetary G0-G1 conditions
are forecast on 10-Apr due to high speed wind stream effects
from an equatorial coronal hole. G0, with a chance of G1, conditions
are expected on 11-12 Apr as these high speed wind stream effects
continue.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
09 Apr Normal-fair Normal Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
10 Apr Normal-fair Normal-fair Fair-normal
11 Apr Normal-fair Normal-fair Fair-normal
12 Apr Normal Normal Normal-fair
COMMENT: Global ionospheric conditions were mostly normal-fair
over UT day 09-Apr, with some degradations observed during local
night hours in the Asian, Australian, and South African regions.
Normal-fair conditions are expected on 10-11 Apr, with degradations
possible due to expected geomagnetic activity. These conditions
are expected to trend towards normal on 12-Apr, as this geomagnetic
activity passes.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
09 Apr 80
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 20% during local day.
Enhanced by 45% during local night.
Niue Island Region:
Near predicted monthly values.
Northern Australian Region:
Near predicted monthly values during local day.
Depressed by 15% during local night.
Southern Australian Region:
Near predicted monthly values 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
Mar 92
Apr 83
May 81
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
10 Apr 65 Depressed 10 to 15%/near predicted monthly values
11 Apr 70 Depressed 10 to 15%/near predicted monthly values
12 Apr 82 Near predicted monthly values
COMMENT: Maximum Usable Frequencies (MUFs) in the Australian
region were mostly near predicted monthly values on 09-Apr, with
some depressions of up to 15% during local night hours. Enhancements
of 20-45% were observed at the Cocos Islands. Sporadic-E was
observed in Canberra and Darwin, with spread F also observed
in Hobart. MUFs are forecast to become depressed by 10-15% during
10-11 Apr due to upcoming coronal hole high speed wind stream
effects. These will begin to trend towards predicted values on
12-Apr as the high speed wind stream effects begin to subside.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 08 Apr
Daily Proton Fluence >1 MeV: 6.4E+05
Daily Proton Fluence >10 MeV: 1.9E+04
Daily Electron Fluence >2 MeV: 3.40E+08 (moderate fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability:20%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B6.4
DSCOVR Satellite Solar Wind Day Averaged Data for 08 Apr
Speed: 391 km/sec Density: 1.9 p/cc Temp: 88800 K Bz: -2 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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