[Ips-dsgr] ASWFC Daily Report - 06 June 25 issued 2331 UT on 06 Jun 2025 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sat Jun 7 09:31:11 AEST 2025
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/06 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 06 JUNE AND FORECAST FOR 07 JUNE - 09 JUNE
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 06 Jun: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 06 Jun: 128/81
1B. SOLAR FORECAST
07 Jun 08 Jun 09 Jun
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 128/81 125/78 125/78
COMMENT: Solar activity on UT day 06-Jun was at the R0 level
with no significant flare activity. Solar region AR4105 (S14E37,
beta-gamma) exhibited a mix of growth and decay, with spots now
appearing more spread out and may be in overall decay. This region
produced several minor C class flares, with the largest a C4.5
at 06/1702UT.The other region of interest AR4100 (N09W77, beta)
is approaching the northwest solar limb and has steadily declined
over recent days and also produced C class flare activity. There
are currently five numbered sunspot regions visible on the solar
disk. A new small sunspot region has emerged at S19E16 and currently
shows a more simple beta/bipolar magnetic configuration. All
other sunspot regions are either stable or in decay. Solar activity
is expected to be at the R0 level over 07-09 Jun. A previously
R3 flare producing region, AR4087 is due back to the northeast
solar limb on 07-Jun, however this region had decayed before
rotating off disk in its previous solar disk transit. Solar radiation
storm conditions were at the S0 level on 06-Jun. S0 conditions
are expected over 07-09 Jun. No Earth-directed CMEs have been
observed. A very slow southward CME, directed out of the ecliptic
plane, was observed during the interval 05/1100-06/0738UT. A
northeast directed CME was observed from 06/112UT. Neither of
these CME's could be correlated to any on disk solar activity
or plasma motion. The solar wind speed on UT day 06-Jun declined,
ranging from 385 to 571 km/s and is currently near 395 km/s.
The peak total interplanetary magnetic field strength (IMF, Bt)
was 6 nT and the north-south IMF component (Bz) range was -3
to +4 nT. The solar wind speed is expected to continue to slowly
decline over the next few days as influence of a coronal hole
wind stream from a coronal hole now located in the southwest
solar quadrant declines. The US GOES 2MeV electron flux is currently
high and is statistically associated to an increased internal
charging/anomaly risk for spacecraft.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 06 Jun: G0
Estimated Indices 06 Jun : A K
Australian Region 5 11321121
Cocos Island 4 11221120
Darwin 6 22221122
Townsville 6 21322121
Learmonth 6 12321121
Alice Springs 5 11321121
Gingin 5 11321121
Canberra 5 11321021
Kennaook Cape Grim 8 11431121
Hobart 7 11431021
Estimated Antarctic Regional K Indices 06 Jun :
Macquarie Island 11 12450110
Casey 9 33322122
Mawson 22 44424244
Observed Regional daily pc3 Indices 06 Jun :
Darwin 4 (Quiet)
Townsville 0 (Quiet)
Learmonth 2 (Quiet)
Alice Springs 0 (Quiet)
Gingin 14 (Quiet)
Canberra 24 (Quiet to unsettled)
Hobart 27 (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 06 Jun : A
Fredericksburg 7
Planetary 9
Observed AFr/Ap Indices 05 Jun : A K
Fredericksburg 15
Planetary 12 4223 3322
2B. MAGNETIC FORECAST
Date Ap Conditions
07 Jun 10 G0
08 Jun 10 G0
09 Jun 8 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 06-Jun. Mostly G0 geomagnetic conditions were
observed in the Antarctic region, with an isolated G1 period
at Macquarie Island. G0 geomagnetic conditions are expected over
07-09 Jun.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
06 Jun Normal Fair-normal Fair-normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
07 Jun Normal Fair-normal Fair-normal
08 Jun Normal Fair-normal Fair-normal
09 Jun Normal Fair-normal Fair-normal
COMMENT: HF radio propagation conditions on UT day 06-Jun were
fair to normal. HF conditions are expected to be fair to normal
over 07-09 Jun.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
06 Jun 69
Observed Australian Regional MUFs
Cocos Island Region:
Near predicted monthly values during local day.
Depressed by 20% during local night.
Niue Island Region:
Depressed by 15% during local day.
Depressed by 20% during local night.
Northern Australian Region:
Near predicted monthly values during local day.
Depressed by 40% during local night.
Southern Australian Region:
Depressed by 15% during local day.
Depressed by 25% during local night.
Antarctic Region (Casey/Davis/Mawson):
Near predicted monthly values over the UT day.
Monthly T index:
Month T index
May 94
Jun 109
Jul 107
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
07 Jun 90 Depressed 15%/near predicted monthly values
08 Jun 90 Depressed 15%/near predicted monthly values
09 Jun 90 Depressed 15%/near predicted monthly values
COMMENT: ASWFC HF Communications Warning 59 was issued on 6 June
and is current for 6-7 Jun. Maximum usable frequencies (MUFs)
in the southern Australian region on UT day 06-Jun were depressed
by up to 25%. MUFs in the northern Australian region were near
predicted monthly values to depressed by 40% during local night.
Spread F was observed at Hobart, Townsville and Darwin during
local night hours. MUFs are expected to be mildly depressed by
15% to near predicted monthly values over 07-09 Jun.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 05 Jun
Daily Proton Fluence >1 MeV: 1.6E+07
Daily Proton Fluence >10 MeV: 2.4E+04
Daily Electron Fluence >2 MeV: 8.70E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability:10%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B6.9
DSCOVR Satellite Solar Wind Day Averaged Data for 05 Jun
Speed: 612 km/sec Density: 1.5 p/cc Temp: 177000 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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