[Ips-dsgr] ASWFC Daily Report - 29 May 26 issued 2330 UT on 29 May 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sat May 30 09:30:51 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/29 MAY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 29 MAY AND FORECAST FOR 30 MAY - 01 JUNE
STATUS INDICATORS SOL:** YELLOW ** MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 29 May: R1
Flares Max Fadeout Freq. Sectors
M1.1 0705UT possible lower Mid East/Indian
Observed 10.7 cm flux/Equivalent Sunspot Number for 29 May: 148/102
1B. SOLAR FORECAST
30 May 31 May 01 Jun
Activity R0-R1 R0-R1 R0-R1
Fadeouts Possible Possible Possible
10.7cm/SSN 145/99 142/96 138/92
COMMENT: Solar flare activity on UT day 29-May was at the R1
level due to an M1.1 flare at 29/0704UT. There are currently
eight numbered sunspot regions visible on the solar disk. Newly
rotated on Active Region (AR) 4455 (N14E46, beta) was responsible
for the only R1 level flare event of the UT day. This region
showed some spot decay. AR 4446 (S13W07, beta-gamma) showed spot
development and 4452 (N09W44, beta-gamma) showed spot movement.
These two regions are the most magnetically complex sunspot regions
on the solar disk currently. All other sunspot regions are either
stable or in decay. Solar flare activity is expected to be at
R0-R1 levels over 30-May to 01-Jun. S0 solar radiation storm
conditions were observed on UT day 29-May. S0 solar radiation
storm conditions are expected over 30-May to 01-Jun. No Earth-directed
coronal mass ejections (CMEs) have been observed. A west directed
CME is visible from 29/0012UT in SOHO and STEREO-A imagery. This
CME is considered a far side event and not geoeffective. The
solar wind speed declined slightly on UT day 29-May, mostly ranging
between 370 to 460 km/s and is currently near 420 km/s. The peak
total interplanetary magnetic field strength (IMF, Bt) was 9
nT and the north-south IMF component (Bz) range was -8 to +5
nT. The solar wind speed is expected to remain at current levels
over 30-May to 01-Jun, with a chance of an increase on 01-Jun
due to a small equatorial coronal hole rotating towards a geoeffective
position.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 29 May: G0
Estimated Indices 29 May : A K
Australian Region 8 22123322
Cocos Island 6 22122222
Darwin 7 22122322
Townsville 11 -3223332
Learmonth 12 32223333
Alice Springs 10 22223332
Gingin 13 32223433
Canberra 8 22113322
Kennaook Cape Grim 8 22123322
Hobart 8 22123322
Estimated Antarctic Regional K Indices 29 May :
Macquarie Island 16 22235431
Casey 14 33224333
Mawson 38 24424475
Observed Regional daily pc3 Indices 29 May :
Darwin 0 (Quiet)
Townsville 11 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 6 (Quiet)
Canberra 13 (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 29 May : A
Fredericksburg 10
Planetary 13
Observed AFr/Ap Indices 28 May : A K
Fredericksburg 13
Planetary 13 2233 3433
2B. MAGNETIC FORECAST
Date Ap Conditions
30 May 10 G0
31 May 8 G0
01 Jun 8 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
and planetary regions on UT day 29-May. Mostly G1 geomagnetic
conditions were observed in the Antarctic region, with an isolated
period of G3 observed at Mawson. G0 planetary geomagnetic conditions
are expected over 30-May to 01-Jun.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
29 May Normal Normal Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
30 May Normal Normal Normal-fair
31 May Normal Normal Normal-fair
01 Jun Normal Normal Normal-fair
COMMENT: Global ionospheric conditions were mostly normal during
UT day 29-May, with some degradations at high latitudes in the
northern hemisphere. Ionospheric conditions are expected to be
mostly normal over 30-May to 01-Jun, with some degradations expected
at high latitudes over the forecast period.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
29 May 97
Observed Australian Regional MUFs
Cocos Island Region:
No data available during local day.
No data available during local night.
Niue Island Region:
Enhanced by 15% during local day.
Depressed by 15% during local night.
Northern Australian Region:
Enhanced by 20% during local day.
Near predicted monthly values during local night.
Southern Australian Region:
Enhanced by 15% during local day.
Enhanced by 15% during local night.
Antarctic Region (Casey/Davis/Mawson):
Near predicted monthly values over the UT day.
Monthly T index:
Month T index
Apr 74
May 71
Jun 68
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
30 May 90 Near to 15% above predicted monthly values
31 May 90 Near to 15% above predicted monthly values
01 Jun 90 Near to 15% above predicted monthly values
COMMENT: Maximum Usable Frequencies (MUFs) on 29-May in the Australian
region were enhanced by 20% in the northern Australian region
during local day and near predicted monthly values during local
night. MUFs in the southern Australian region were enhanced by
15% throughout the day. Spread-F was observed at Hobart during
local night hours. Ionospheric scintillation was observed at
Weipa over the interval 29/1658-1713UT. MUFs are expected to
be near predicted monthly values to 15% enhanced over 30-May
to 01-Jun.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 28 May
Daily Proton Fluence >1 MeV: 5.7E+05
Daily Proton Fluence >10 MeV: 2.4E+04
Daily Electron Fluence >2 MeV: 1.70E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 3%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B7.7
DSCOVR Satellite Solar Wind Day Averaged Data for 28 May
Speed: 401 km/sec Density: 3.8 p/cc Temp: 100000 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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