[Ips-dsgr] ASWFC Daily Report - 08 April 26 issued 2330 UT on 08 Apr 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Thu Apr 9 09:30:38 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/08 APRIL 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 08 APRIL AND FORECAST FOR 09 APRIL - 11 APRIL
STATUS INDICATORS SOL:** YELLOW ** MAG:** YELLOW ** ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 08 Apr: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 08 Apr: 108/58
1B. SOLAR FORECAST
09 Apr 10 Apr 11 Apr
Activity R0, chance of R1 R0, chance of R1 R0, chance of R1
Fadeouts Possible Possible Possible
10.7cm/SSN 105/54 100/48 95/41
COMMENT: Solar flare activity was at the R0 level on UT day 08-Apr,
with a C8.7 flare at 08/1543 from Active Region (AR) 4414 (N12E65,
beta), the largest observed over the UT day. This region is one
of five numbered regions on the solar disk, and has shown some
growth as it continues to rotate onto the front side of the solar
disk. AR 4409 (N05W67) remains the most magnetically complex
region, and will likely rotate off the western limb in the next
24 hours. Region 4415 (S19E71) has recently shown growth as it
rotated over the eastern edge of the Sun, and currently exhibits
an alpha magnetic classification. A small unnumbered region appeared
at S06W29 and is currently magnetically simple. All other regions
are either stable or in decay. Solar flare activity is forecast
to be at the R0 level, with a chance of R1 over 09-11 Apr, due
to the newly emerged regions on the visible disk. S0 solar proton
conditions were observed throughout 08-Apr, with solar proton
flux consistent with background levels across the UT day. S0
solar proton conditions are forecast for 09-11 Apr. No Earth-directed
coronal mass ejections (CMEs) were observed over the last UT
day. Two solar eruptions on the eastern limb were observed in
SDO/AIA 304A imaging over the last UT day, including one at 07/2317UT,
and another at 08/0809UT. These produced a combined low velocity
east-directed CME, which has been modelled to miss the Earth.
The solar wind was moderate and stable over the last 24 hours,
with speeds ranging between 380-430 km/s throughout the UT day.
The interplanetary magnetic field strength (IMF, Bt) peaked at
6 nT during 08-Apr, with the north-south component (Bz) ranging
between -5 and +4 nT during this time. The solar wind speed is
forecast to remain stable over most of 09-Apr, before rising
late in the UT day as the Earth connects with an equatorial coronal
hole high-speed wind stream. The solar wind is expected to remain
elevated over 10-11 Apr.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 08 Apr: G0
Estimated Indices 08 Apr : A K
Australian Region 6 12132122
Cocos Island 3 11111121
Darwin 7 22132122
Townsville 7 22232122
Learmonth - --------
Alice Springs 6 11132122
Gingin 6 11032132
Canberra 4 01132111
Kennaook Cape Grim 7 12133221
Hobart 7 12133121
Estimated Antarctic Regional K Indices 08 Apr :
Macquarie Island 11 11054211
Casey 12 34331222
Mawson 24 33222365
Observed Regional daily pc3 Indices 08 Apr :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth NA
Alice Springs 0 (Quiet)
Gingin 0 (Quiet)
Canberra 2 (Quiet)
Hobart 3 (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 08 Apr : A
Fredericksburg 6
Planetary 8
Observed AFr/Ap Indices 07 Apr : A K
Fredericksburg 7
Planetary 9 3221 2223
2B. MAGNETIC FORECAST
Date Ap Conditions
09 Apr 14 G0-G1
10 Apr 20 G0-G1
11 Apr 18 G0, chance of G1
COMMENT: ASWFC Geomagnetic Warning 26 was issued on 7 April and
is current for 9-10 Apr. Geomagnetic conditions in the Australian
region were at the G0 level on UT day 08-Apr, with G0 conditions
also reported at the planetary level. Periods of G1-G2 geomagnetic
conditions were recorded in the Antarctic region. G0-G1 conditions
are forecast for 09-Apr, with two equatorial coronal holes likely
to move into a geoeffective position late in the UT day. G0-G1
conditions are forecast for 10-Apr due to the high-speed wind
stream effects of these coronal holes. This will decrease to
G0, with a chance of G1 on 11-Apr.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
08 Apr Normal-fair Normal Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
09 Apr Normal Normal Fair-normal
10 Apr Normal Normal-fair Fair-normal
11 Apr Normal Normal-fair Fair-normal
COMMENT: Global ionospheric conditions were mostly normal-fair
across UT day 08-Apr, with some degradations in the equatorial
South American and South African regions during local night hours.
Mostly normal conditions are expected on 09-11 Apr, with some
degradations possible over this period, particularly in high
latitude regions, due to upcoming geomagnetic activity. Minor
shortwave fadeouts are possible.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
08 Apr 93
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 20% during local day.
Near predicted monthly values during local night.
Niue Island Region:
Enhanced by 25% during local day.
Near predicted monthly values during local night.
Northern Australian Region:
Near predicted monthly values during local day.
Enhanced by 20% 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
09 Apr 90 Near predicted monthly values
10 Apr 85 Near predicted monthly values
11 Apr 80 5 to 10% below predicted monthly values
COMMENT: Maximum Usable Frequencies (MUFs) in the Australian
region on UT day 08-Apr were near predicted values, with enhancements
of 20-25% observed in the Northern Australian region and at Cocos
Island and Niue Island during local daylight hours. Sporadic-E
was also observed in Norfolk Island during local night hours.
Scintillation was observed at Darwin during the interval 08/1324-1340UT.
MUFs are expected to be near predicted monthly values to around
10% enhanced over 09-Apr. MUFs may become mildly depressed during
10-11 Apr, especially in the Southern Australian region, due
to upcoming coronal hole high-speed wind stream effects. Minor
shortwave fadeouts are possible.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 07 Apr
Daily Proton Fluence >1 MeV: 1.2E+06
Daily Proton Fluence >10 MeV: 2.1E+04
Daily Electron Fluence >2 MeV: 2.80E+08 (moderate fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability:18%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B4.8
DSCOVR Satellite Solar Wind Day Averaged Data for 07 Apr
Speed: 448 km/sec Density: 2.0 p/cc Temp: 64600 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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