[Ips-dsgr] ASWFC Daily Report - 05 June 26 issued 2330 UT on 05 Jun 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sat Jun 6 09:30:52 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/05 JUNE 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 05 JUNE AND FORECAST FOR 06 JUNE - 08 JUNE
STATUS INDICATORS SOL:** YELLOW ** MAG:** YELLOW ** ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 05 Jun: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 05 Jun: 141/95
1B. SOLAR FORECAST
06 Jun 07 Jun 08 Jun
Activity R1-R2 R0-R1 R0-R1
Fadeouts Possible Possible Possible
10.7cm/SSN 142/96 140/94 140/94
COMMENT: Solar activity on UT day 5-Jun was R0, with no solar
flares. There are currently six numbered sunspot regions on the
solar disk. The dominating active region (AR) 4455 (N15W46, beta)
has remained mostly stable with some minor decay of its trailing
spots. Regions 4456 (N18W19, beta), 4458 (S04W33, beta) and 4462
(N17E34, beta) have shown minor growth but do not contain a strong
leader spot. All other sunspot regions are either stable or in
decay. Solar activity is expected to be R1-R2 on 6-Jun, trending
to R0-R1 over 7-8 Jun.
A halo CME was observed from 0924 UT on 5-Jun, but is considered a
farside event. No Earth directed CMEs were observed on UT day 5-Jun.
S0 solar radiation storm conditions were observed on UT day 5-Jun.
S0 solar radiation storm conditions are expected over 6-8 Jun.
The solar wind on UT day 5-Jun was disturbed due to the late arrival
of the anticipated CMEs. An arrival was noted from 0423 UT. Further
arrival signatures are not clear in the solar wind, but arrivals are
evident from ACE EPAM data. The solar wind speed ranged from 425 km/s to
740 km/s and is on an increasing trend. The peak total interplanetary
field strength (IMF, Bt) was 20 nT and the north-south IMF component
range (Bz) was +14 to -17 nT with some brief periods of southward
IMF. The solar wind is expected to return to near background
levels by 6-Jun, remaining quiet over 7-8 Jun.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 05 Jun: G1
Estimated Indices 05 Jun : A K
Australian Region 21 14225533
Cocos Island 13 14223333
Darwin 17 14324433
Townsville 21 14225533
Learmonth 27 15235544
Alice Springs 20 04225533
Gingin 22 13225544
Canberra 19 03225533
Kennaook Cape Grim 20 03225543
Hobart 19 03225533
Estimated Antarctic Regional K Indices 05 Jun :
Macquarie Island 28 02036643
Casey 15 13324433
Mawson 34 14225437
Observed Regional daily pc3 Indices 05 Jun :
Darwin 2 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 0 (Quiet)
Canberra 13 (Quiet)
Hobart 34 (Quiet to unsettled)
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 05 Jun : A
Fredericksburg 25
Planetary 44
Observed AFr/Ap Indices 04 Jun : A K
Fredericksburg 7
Planetary 6 3311 211-
2B. MAGNETIC FORECAST
Date Ap Conditions
06 Jun 17 G0-G1, chance G2
07 Jun 11 G0
08 Jun 8 G0
COMMENT: ASWFC Geomagnetic Warning 35 was issued on 4 June and
is current for 4-6 Jun. On UT day 5-Jun G1 geomagnetic conditions
were observed in the Australian region. G1-G2 geomagnetic conditions
were observed in the Antarctic region and the planetary scale
registered G2 conditions. Geomagnetic activity has mostly subsided
by the end of 5-Jun, but given the solar wind is currently very
strong G0-G1 geomagnetic conditions are expected on 6-Jun due
to any lingering activity with a chance for isolated periods
of G2. G0 geomagnetic conditions are expected over 7-8 Jun.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
05 Jun Normal Normal-fair Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
06 Jun Normal Normal-fair Normal-fair
07 Jun Normal Normal Normal
08 Jun Normal Normal Normal
COMMENT: Global ionospheric conditions on UT day 5-Jun were mostly
normal, with some degradations in the southern hemisphere over
the day. HF radio conditions may be mildly degraded on 6-Jun
due to lingering geomagnetic activity, but recovered by 7-8 Jun.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
05 Jun 77
Observed Australian Regional MUFs
Cocos Island Region:
No data available during local day.
No data available during local night.
Niue Island Region:
Near predicted monthly values.
Northern Australian Region:
Enhanced by 15% during local day.
Near predicted monthly values during local night.
Southern Australian Region:
Near predicted monthly values 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
May 67
Jun 68
Jul 65
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
06 Jun 80 Near predicted monthly values to 10-20% depressed
07 Jun 90 Near predicted monthly values to 10-20% depressed
08 Jun 95 Near predicted monthly values
COMMENT: ASWFC SWF HF Communications Warning 52 was issued on
4 June and is current for 4-6 Jun. Maximum usable frequencies
(MUFs) on UT day 5-Jun were near predicted values to 15% enhanced.
Conditions were degraded in Darwin and Norfolk Island during
local night hours. Spread-F was observed in Townsville and Hobart
during local night hours. MUFs are expected to become 10-20%
depressed over 6-7 Jun due to recent geomagnetic activity. Some
spread-F is possible. Conditions are likely to improve by 8-Jun.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 04 Jun
Daily Proton Fluence >1 MeV: 1.1E+05
Daily Proton Fluence >10 MeV: 1.7E+04
Daily Electron Fluence >2 MeV: 1.60E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 3%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B9.4
DSCOVR Satellite Solar Wind Day Averaged Data for 04 Jun
Speed: 416 km/sec Density: 1.8 p/cc Temp: 149000 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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