[Ips-dsgr] ASWFC Daily Report - 04 June 26 issued 2331 UT on 04 Jun 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Fri Jun 5 09:31:55 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/04 JUNE 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 04 JUNE AND FORECAST FOR 05 JUNE - 07 JUNE
STATUS INDICATORS SOL:** RED ** MAG:** RED ** ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 04 Jun: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 04 Jun: 148/102
1B. SOLAR FORECAST
05 Jun 06 Jun 07 Jun
Activity R2, chance R3 R2, chance R3 R2, chance R3
Fadeouts Probable Probable Probable
10.7cm/SSN 145/99 143/97 140/94
COMMENT: Solar flare activity on UT day 04-Jun was at the R0
level with several low-level C-class flares observed. There are
currently eight numbered active regions visible on the solar
disk and one unnumbered region. Active region (AR) 4455 (N15W31,
beta-gamma) is the largest and most magnetically complex region
on the disk and has exhibited slight spot development over the
UT day. Regions 4458 (S04W20, beta), 4459 (N14E22, beta), 4460
(S23W85, beta) and 4462 (N19E45, beta) all have shown some spot
growth over the UT day. All other regions are either stable or
in decay. Solar flare activity is expected to be at R2 level
over 05-07 Jun, with a chance of R3. S0 solar radiation storm
conditions were observed on UT day 04-Jun. S0 solar radiation
storm conditions are expected over 05-07 Jun. No Earth-directed
coronal mass ejections (CMEs) have been observed. A narrow east-directed
CME was observed, visible in LASCO C2 coronagraph imagery from
04/0424UT. Modelling indicates this CME does not contain an Earth-directed
component. The solar wind speed on UT day 04-Jun was stable,
ranging from 385 to 445 km/s and is currently near 420 km/s.
The peak total interplanetary magnetic field strength (IMF, Bt)
was 11 nT and the north-south IMF component (Bz) range was -9
to +6 nT. The solar wind speed is expected to increase on 05-Jun
due to the anticipated arrival of three CMEs first observed on
03-Jun then remain elevated over 06-07 Jun.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 04 Jun: G0
Estimated Indices 04 Jun : A K
Australian Region 1 21001000
Cocos Island 1 11100000
Darwin 2 21101001
Townsville 3 22101101
Learmonth 1 21100000
Alice Springs 1 22000000
Gingin 1 21000000
Canberra 1 12001000
Kennaook Cape Grim 1 11001000
Hobart 2 12001100
Estimated Antarctic Regional K Indices 04 Jun :
Macquarie Island 1 11002000
Casey 4 32111101
Mawson 9 34322101
Observed Regional daily pc3 Indices 04 Jun :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 6 (Quiet)
Canberra 11 (Quiet)
Hobart 16 (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 04 Jun : A
Fredericksburg 23
Planetary 41
Observed AFr/Ap Indices 03 Jun : A K
Fredericksburg 11
Planetary 10 3222 2223
2B. MAGNETIC FORECAST
Date Ap Conditions
05 Jun 46 G2, chance G3
06 Jun 25 G0-G1
07 Jun 10 G0
COMMENT: ASWFC Geomagnetic Warning 35 was issued on 4 June and
is current for 4-6 Jun. G0 geomagnetic conditions were observed
in the Australian, Antarctic and planetary regions on UT day
04-Jun. G2, with a chance of G3 planetary geomagnetic conditions
are expected over 05-Jun and G0-G1 over 06-Jun due to the arrival
of three CMEs first observed on 03-Jun. The first CME is expected
to arrival on 04/1400UT +/- 10 hrs but is yet to arrive with
the second and third CMEs expected to arrival on 05/1000UT +/-
10 hrs. G0 planetary geomagnetic conditions are expected for
07-Jun.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
04 Jun Normal Normal-fair Fair-poor
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
05 Jun Normal-fair Fair Fair-poor
06 Jun Normal-fair Fair Fair-poor
07 Jun Normal Normal Normal-fair
COMMENT: Global ionospheric conditions were mostly normal to
fair on UT day 04-Jun, with fair to poor conditions at high latitudes.
Global ionospheric conditions are expected to be initially normal
becoming fair to poor over 05-06 Jun due to anticipated geomagnetic
activity, with degradations possible at high to mid latitudes.
Shortwave fadeouts are probable.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
04 Jun 82
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:
Near predicted monthly values.
Southern Australian Region:
Enhanced by 15% during local day.
Near predicted monthly values 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
05 Jun 60 Near predicted monthly values
06 Jun 65 Near predicted monthly values
07 Jun 75 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) in the Australian region were mostly near predicted monthly
values to 15% enhanced on UT day 04-Jun. Spread-F was observed
at Hobart, Learmonth, Norfolk Island and Perth during local night
hours. MUFs are expected to be near predicted monthly values
over 05-07 Jun. Shortwave fadeouts are probable.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 03 Jun
Daily Proton Fluence >1 MeV: 2.2E+05
Daily Proton Fluence >10 MeV: 1.8E+04
Daily Electron Fluence >2 MeV: 2.40E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 4%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B9.6
DSCOVR Satellite Solar Wind Day Averaged Data for 03 Jun
Speed: 418 km/sec Density: 3.8 p/cc Temp: 91400 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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