[Ips-dsgr] ASWFC Daily Report - 05 April 26 issued 2330 UT on 05 Apr 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Mon Apr 6 09:30:43 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/05 APRIL 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 05 APRIL AND FORECAST FOR 06 APRIL - 08 APRIL
STATUS INDICATORS SOL:** YELLOW ** MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 05 Apr: R0
Flares Max Fadeout Freq. Sectors
M1.0 04/2304UT possible lower West Pacific
Observed 10.7 cm flux/Equivalent Sunspot Number for 05 Apr: 118/70
1B. SOLAR FORECAST
06 Apr 07 Apr 08 Apr
Activity R1, chance of R2 R1, chance of R2 R1, chance of R2
Fadeouts Possible Possible Possible
10.7cm/SSN 118/70 115/66 113/64
COMMENT: Solar flare activity was at the R0 level on UT day 05-Apr,
with no M-class or greater flares observed. There are currently
six sunspot regions on the visible disk, with Active Region (AR)
4409 (N05W25, beta-gamma) being the most magnetically complex.
This region has shown some spot redistribution over the last
24 hours, and has remained largely stable. Newly numbered AR
4412 appeared on the solar disk at N10E11, and currently exhibits
an alpha magnetic classification. All other regions are either
stable or in decay. Solar flare activity is expected to be at
the R1 level, with a chance of R2, over the period 06-08 Apr,
due to ongoing flare activity from AR 4409. S0 solar proton conditions
were observed throughout 05-Apr, with the solar proton flux continuing
to slowly decline toward background values. S0 solar proton conditions
are expected over 06-08 Apr. No Earth directed coronal mass ejections
(CMEs) were observed in coronagraph imagery over the last 24
hours. The solar wind speed remained strong on 05-Apr, while
slowly declining across the UT day. The solar wind speed began
the day ranging between 570-590 km/s, and by the end of the UT
day was ranging between 520-540 km/s. The interplanetary magnetic
field strength (IMF, Bt) remained mostly constant across the
UT day, peaking at 6 nT, with the north-south component (Bz)
ranging between -5 and +5 nT. The solar wind speed is expected
to continue to decline towards background levels over 06-08 Apr.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 05 Apr: G0
Estimated Indices 05 Apr : A K
Australian Region 11 32333311
Cocos Island 5 22222210
Darwin 10 33323212
Townsville 9 32233301
Learmonth - --------
Alice Springs 8 22232302
Gingin 10 22333312
Canberra 7 22232301
Kennaook Cape Grim 11 32333311
Hobart 12 33333311
Estimated Antarctic Regional K Indices 05 Apr :
Macquarie Island 15 22354310
Casey 18 44532312
Mawson 34 66433433
Observed Regional daily pc3 Indices 05 Apr :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth NA
Alice Springs 0 (Quiet)
Gingin 2 (Quiet)
Canberra 2 (Quiet)
Hobart 24 (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 05 Apr : A
Fredericksburg 11
Planetary 12
Observed AFr/Ap Indices 04 Apr : A K
Fredericksburg 12
Planetary 16 5433 1242
2B. MAGNETIC FORECAST
Date Ap Conditions
06 Apr 8 G0
07 Apr 6 G0
08 Apr 6 G0
COMMENT: Geomagnetic conditions in the Australian region remained
at the G0 level on UT day 05-Apr, with G0 geomagnetic conditions
also reported at the planetary level. G1-G2 intervals were recorded
in the Antarctic region. G0 geomagnetic conditions are forecast
for 06-08 Apr.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
05 Apr Fair-normal Fair-normal Fair-normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
06 Apr Normal Normal Normal-fair
07 Apr Normal Normal Normal-fair
08 Apr Normal Normal Normal-fair
COMMENT: Global ionospheric conditions were fair-normal on UT
day 05-Apr, with conditions improving across the last 24 hours.
Early observed ionospheric degradations were due to the lingering
effects of previous geomagnetic activity, but trended towards
normal by the end of the UT day. MUFs in the European region
were depressed by 15%. Ionospheric conditions are expected to
be mostly normal over 06-08 Apr. Shortwave fadeouts are possible.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
05 Apr 84
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 20% 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 during local day.
Enhanced by 15% during local night.
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
Mar 92
Apr 83
May 81
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
06 Apr 85 Near predicted monthly values
07 Apr 90 Near predicted monthly values
08 Apr 90 Near predicted monthly values
COMMENT: Maximum Usable Frequencies (MUFs) in the Australian
region were mostly near predicted values on 05-Apr, with some
enhancements seen during local daylight hours in the northern
Australian region, as well as at Niue Island and the Cocos Islands.
Some sporadic-E was observed during local night hours across
the Australian region, and spread F was observed in Hobart. MUFs
are expected to be near predicted monthly values over 06-08 Apr.
Shortwave fadeouts are possible.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 04 Apr
Daily Proton Fluence >1 MeV: 2.3E+07
Daily Proton Fluence >10 MeV: 1.3E+05
Daily Electron Fluence >2 MeV: 9.70E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability:10%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B5.8
DSCOVR Satellite Solar Wind Day Averaged Data for 04 Apr
Speed: 622 km/sec Density: 0.7 p/cc Temp: 173000 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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