[Ips-dsgr] ASWFC Daily Report - 06 April 26 issued 2330 UT on 06 Apr 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Tue Apr 7 09:30:42 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/06 APRIL 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 06 APRIL AND FORECAST FOR 07 APRIL - 09 APRIL
STATUS INDICATORS SOL:** YELLOW ** MAG:** YELLOW ** ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 06 Apr: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 06 Apr: 116/68
1B. SOLAR FORECAST
07 Apr 08 Apr 09 Apr
Activity R0-R1 R0-R1 R0-R1
Fadeouts Possible Possible Possible
10.7cm/SSN 110/60 105/54 105/54
COMMENT: Solar flare activity was at the R0 level on UT day 06-Apr.
Solar region AR4409 (N05W37, beta-gamma) is the most significant
solar region on the visible solar disk and is in decay. Small
solar region AR4412 (N10W01, beta) is growing. There are currently
seven sunspot regions on the visible solar disk. The solar regions
are mostly small in size and generally located in the western
solar hemisphere with the eastern solar hemisphere largely devoid
of spots. All other regions are either stable or in decay. A
new solar region is rotating onto the solar disk at solar latitude
N12. A small 10-15 degree long solar filament located at S40W55
erupted at 06/1350UT in GONG H-alpha imagery. Solar flare activity
is expected to be R0-R1 over 07-09 Apr. S0 solar radiation storm
conditions were observed on 06-Apr. S0 solar radiation storm
conditions are expected over 07-09 Apr. No Earth directed coronal
mass ejections (CMEs) were observed. No CME appeared to follow
the filament eruption in the far southwest solar quadrant, with
coronagraph imagery available up to 06/1524UT. A number of coronal
holes appear to be in the eastern solar hemisphere. On the previous
solar rotation this was one large thin hole and now appears to
have closed in places, resulting in isolated hole segments. The
solar wind speed was steady and moderate to strong on 06-Apr.
The solar wind speed ranged from 498 to 545 km/s, and is currently
at 500 km/s. The peak total interplanetary magnetic field strength
(IMF, Bt) was 5 nT and the north-south component (Bz) range was
-5 and +5 nT. The solar wind speed is expected to continue to
decline towards background levels over 07-08 Apr. Solar wind
27 day recurrence patterns suggest a strong increase in the solar
wind over 09-10 Apr, however on this solar rotation the coronal
hole appears to be more segemented and reduced in area, implying
a reduced influence on the solar wind speed. The flux of electrons
with an energy of greater than 2 MeV at geosynchronous orbit
as measured by the US GOES satellite has been enhanced, which
is statistically associated with the increased risk of geosynchronous
satellite operational anomalies.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 06 Apr: G0
Estimated Indices 06 Apr : A K
Australian Region 6 12222221
Cocos Island 5 12212220
Darwin 8 22222232
Townsville 6 22122222
Learmonth - --------
Alice Springs 5 12122221
Gingin 8 12222331
Canberra 6 12222221
Kennaook Cape Grim 8 12222332
Hobart 6 12222222
Estimated Antarctic Regional K Indices 06 Apr :
Macquarie Island 9 12234221
Casey 19 35433332
Mawson 26 34333364
Observed Regional daily pc3 Indices 06 Apr :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth NA
Alice Springs 0 (Quiet)
Gingin 13 (Quiet)
Canberra 20 (Quiet)
Hobart 18 (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 06 Apr : A
Fredericksburg 8
Planetary 9
Observed AFr/Ap Indices 05 Apr : A K
Fredericksburg 8
Planetary 12 4333 2211
2B. MAGNETIC FORECAST
Date Ap Conditions
07 Apr 6 G0
08 Apr 6 G0
09 Apr 16 G0-G1
COMMENT: G0 geomagnetic conditions were observed in the Australian
on UT day 06-Apr. G0-G2 conditions were observed in the Antarctic
region. G0 geomagnetic conditions are expected for 07-08 Apr.
A coronal hole wind stream may induce G1 periods from late 09-Apr
to 10-Apr, though the coronal hole appears greatly reduced in
area on this rotation.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
06 Apr Normal Normal Fair-normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
07 Apr Normal Normal Normal
08 Apr Normal Normal Normal
09 Apr Normal Normal-fair Fair
COMMENT: HF radio propagation conditions were generally normal
on 06-Apr. HF conditions are expected to be mostly normal over
07-08 Apr, with fair conditions expected 09-10 Apr at middle
to high latitudes.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
06 Apr 86
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 35% during local day.
Near predicted monthly values during local night.
Niue Island Region:
Near predicted monthly values.
Northern Australian Region:
Mostly 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
Mar 92
Apr 83
May 81
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
07 Apr 90 Near predicted monthly values
08 Apr 90 Near predicted monthly values
09 Apr 90 Near predicted monthly values
COMMENT: ASWFC SWF HF Communications Warning 35 was issued on
5 April and is current for 6-7 Apr. Maximum Usable Frequencies
(MUFs) in the Australian region on UT day 06-Apr were mostly
near predicted values. Spread F was observed at Hobart during
local night hours. MUFs are expected to be near predicted monthly
values over 07-09 Apr. Southern Australian region HF conditions
may become mildly degraded during local night hours over 10-11
Apr.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 05 Apr
Daily Proton Fluence >1 MeV: 7.6E+06
Daily Proton Fluence >10 MeV: 4.0E+04
Daily Electron Fluence >2 MeV: 2.10E+08 (moderate fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability:16%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B5.0
DSCOVR Satellite Solar Wind Day Averaged Data for 05 Apr
Speed: 543 km/sec Density: 1.1 p/cc Temp: 116000 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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