[Ips-dsgr] ASWFC Daily Report - 29 April 26 issued 2331 UT on 29 Apr 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Thu Apr 30 09:31:23 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/29 APRIL 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 29 APRIL AND FORECAST FOR 30 APRIL - 02 MAY
STATUS INDICATORS SOL:** YELLOW ** MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 29 Apr: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 29 Apr: 143/97
1B. SOLAR FORECAST
30 Apr 01 May 02 May
Activity R1, chance of R2 R1, chance of R2 R1, chance of R2
Fadeouts Possible Possible Possible
10.7cm/SSN 140/94 135/89 132/86
COMMENT: Solar flare activity on UT day 29-Apr was at the R0
level, with several low level C-class flares observed. There
are currently five numbered sunspot regions visible on the solar
disk and one unnumbered region. Active Region (AR) 4420 (N16W54,
beta-gamma-delta) is the most magnetically complex region on
the disk. This region has shown mild decay and redistribution
of its leader and intermediate spots. AR 4424 (N17W19, beta-gamma)
has exhibited mild growth in its intermediate spots. Regions
4423 (S07W30, beta) and 4428 (S23E04, beta) have shown spot growth
over the UT day. An unnumbered region recently appeared on the
solar disk near S06E50 (alpha) and is stable. All other sunspot
regions are either stable or in decay. Solar flare activity is
expected to be at the R1 level over 30-Apr to 02-May, with a
chance of R2 due to the complexity of regions 4420 and 4424.
S0 solar proton conditions were observed on UT day 29-Apr. S0
solar proton conditions are expected over 30-Apr to 02-May. No
Earth-directed coronal mass ejections (CMEs) have been observed.
The solar wind speed on UT day 29-Apr mildly declined, ranging
from 345 to 310 km/s and is currently near 320 km/s. The peak
total interplanetary magnetic field strength (IMF, Bt) was 8
nT and the north-south IMF component (Bz) range was -4 to +5
nT. The solar wind speed is expected to mildly increase on 30-Apr
due to a small southern hemisphere coronal hole, then ease on
01-May. A northern hemisphere coronal hole is currently crossing
the central meridian and may influence the solar wind speed on
02-May.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 29 Apr: G0
Estimated Indices 29 Apr : A K
Australian Region 1 00002101
Cocos Island 2 11110011
Darwin 3 11102111
Townsville 3 12102012
Learmonth 2 00002111
Alice Springs 1 00002001
Gingin 2 10002101
Canberra 1 00002001
Kennaook Cape Grim 1 00002101
Hobart 1 00002101
Estimated Antarctic Regional K Indices 29 Apr :
Macquarie Island 0 00001100
Casey 3 12212100
Mawson 3 01111121
Observed Regional daily pc3 Indices 29 Apr :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
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 29 Apr : A
Fredericksburg 3
Planetary 4
Observed AFr/Ap Indices 28 Apr : A K
Fredericksburg 3
Planetary 3 1111 1110
2B. MAGNETIC FORECAST
Date Ap Conditions
30 Apr 8 G0
01 May 6 G0
02 May 6 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian,
planetary and Antarctic regions on UT day 29-Apr. G0 planetary
geomagnetic conditions are expected over 30-Apr to 02-May.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
29 Apr Normal Normal Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
30 Apr Normal Normal Normal-fair
01 May Normal Normal Normal
02 May Normal Normal Normal
COMMENT: Global ionospheric conditions were mostly normal across
UT day 29-Apr, with some degradations observed in the southern
hemisphere. Mostly normal ionospheric conditions are forecast
for 30-Apr to 02-May. Shortwave fadeouts are possible.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
29 Apr 69
Observed Australian Regional MUFs
Cocos Island Region:
No data available during local day.
No data available during local night.
Niue Island Region:
Mostly near predicted monthly values.
Depressed by 20% after local dawn.
Northern Australian Region:
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
30 Apr 75 Near predicted monthly values
01 May 75 Near predicted monthly values
02 May 75 Near predicted monthly values
COMMENT: Maximum Usable Frequencies (MUFs) in the Australian
region were near predicted monthly values across UT day 29-Apr.
Spread F was observed at Hobart during local night hours. MUFs
are expected to remain near predicted monthly values over 30-Apr
to 02-May. Shortwave fadeouts are possible.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 28 Apr
Daily Proton Fluence >1 MeV: Not available
Daily Proton Fluence >10 MeV: Not available
Daily Electron Fluence >2 MeV: Not available
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B9.4
DSCOVR Satellite Solar Wind Day Averaged Data for 28 Apr
Speed: 364 km/sec Density: 3.8 p/cc Temp: 48700 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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