[Ips-dsgr] ASWFC Daily Report - 07 April 26 issued 2330 UT on 07 Apr 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Wed Apr 8 09:30:45 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/07 APRIL 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 07 APRIL AND FORECAST FOR 08 APRIL - 10 APRIL
STATUS INDICATORS SOL:** YELLOW ** MAG:** YELLOW ** ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 07 Apr: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 07 Apr: 109/59
1B. SOLAR FORECAST
08 Apr 09 Apr 10 Apr
Activity R0,chance R1 R0,chance R1 R0,chance R1
Fadeouts Possible Possible Possible
10.7cm/SSN 105/54 105/54 105/54
COMMENT: Solar flare activity was at the R0 level on UT day 07-Apr
with no significant flares observed. The recent region of interest
AR4409 (N05W52, beta) is in overall decay with some umbral convergence
in its leader spot and some minor redevelopment in intermediate
penumbra. This region produced a C5.7 flare at 07/1832UT. Very
small region AR4412 (N10W16, beta) that was growing yesterday
has now rapidly decayed. A new small region AR4413 (N08W58, beta)
has emerged on disk just to the west of AR4408 (N08W42, alpha).
A new unnumbered solar region is rotating onto the solar disk
at solar latitude N12. At this stage this region appears to be
relatively small in size and magnetically simple, though more
spots may rotate onto the disk. There are currently seven numbered
sunspot regions and one new unnumbered region on the visible
solar disk. All other regions are either stable or in decay.
A faint/thin solar filament lifted off the disk located at S20W40
lifted off at 07/1550UT in GONG H-alpha imagery. Solar flare
activity is expected to be R0,chance R1 over 08-10 Apr. S0 solar
radiation storm conditions were observed on 07-Apr. S0 solar
radiation storm conditions are expected over 08-10 Apr. No Earth
directed coronal mass ejections (CMEs) were observed. No CME
was associated with the minor filament eruption. Two isolated
equatorial coronal holes are approaching/crossing the solar central
meridian. The solar wind speed was moderate on 07-Apr with a
declining trend. The solar wind speed ranged from 400 to 523
km/s, and is currently at 424 km/s. The peak total interplanetary
magnetic field strength (IMF, Bt) was 5 nT and the north-south
component (Bz) range was -5 and +3 nT. The IMF Bz component was
mildly southward during the second half of the UT day. The solar
wind speed is expected to continue to decline towards background
levels on 08-Apr. Solar wind 27 day recurrence patterns suggest
that the solar wind will increase over 09-10 Apr, but due to
reduction/fragmentation in area of the coronal hole on this rotation
the increase in the solar wind speed may not be as strong on
this rotation. 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 07 Apr: G0
Estimated Indices 07 Apr : A K
Australian Region 5 22111311
Cocos Island 4 12010311
Darwin 6 22101322
Townsville 6 22211311
Learmonth - --------
Alice Springs 5 22101311
Gingin 6 21111322
Canberra 5 21202311
Kennaook Cape Grim 6 21212311
Hobart 6 21212311
Estimated Antarctic Regional K Indices 07 Apr :
Macquarie Island 7 22302320
Casey 10 33222322
Mawson 31 64321346
Observed Regional daily pc3 Indices 07 Apr :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth NA
Alice Springs 0 (Quiet)
Gingin 2 (Quiet)
Canberra 2 (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 07 Apr : A
Fredericksburg 7
Planetary 9
Observed AFr/Ap Indices 06 Apr : A K
Fredericksburg 6
Planetary 10 1322 3223
2B. MAGNETIC FORECAST
Date Ap Conditions
08 Apr 6 G0
09 Apr 17 G0-G1
10 Apr 18 G0-G1
COMMENT: ASWFC Geomagnetic Warning 26 was issued on 7 April and
is current for 9-10 Apr. G0 geomagnetic conditions were observed
in the Australian on UT day 07-Apr. G0-G2 conditions were observed
in the Antarctic region. G0 geomagnetic conditions are expected
on 08-Apr. A coronal hole wind stream is expected to induce G1
periods from late 09-Apr to 10-Apr.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
07 Apr Normal Normal Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
08 Apr Normal Normal Normal
09 Apr Normal Fair-normal Fair
10 Apr Normal Fair-normal Fair
COMMENT: HF radio propagation conditions were generally normal
on 07-Apr. HF conditions are expected to be mostly normal on
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
07 Apr 97
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 15% during local day.
Enhanced by 60% during local night.
Niue Island Region:
Enhanced by 30% 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:
Mostly 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
08 Apr 90 Near predicted monthly values
09 Apr 90 Near predicted monthly values
10 Apr 90 Near predicted monthly values
COMMENT: Maximum Usable Frequencies (MUFs) in the Australian
region on UT day 07-Apr were mostly near predicted values to
15% enhanced. Darwin MUFs were 40-50% enhanced during local night
hours. MUFs are expected to be near predicted monthly values
over 08-10 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 06 Apr
Daily Proton Fluence >1 MeV: 3.3E+06
Daily Proton Fluence >10 MeV: 2.1E+04
Daily Electron Fluence >2 MeV: 2.60E+08 (moderate fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability:17%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B4.7
DSCOVR Satellite Solar Wind Day Averaged Data for 06 Apr
Speed: 529 km/sec Density: 1.7 p/cc Temp: 115000 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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