[Ips-dsgr] ASWFC Daily Report - 08 June 25 issued 2330 UT on 08 Jun 2025 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Mon Jun 9 09:30:50 AEST 2025
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/08 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 08 JUNE AND FORECAST FOR 09 JUNE - 11 JUNE
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: ** YELLOW **
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 08 Jun: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 08 Jun: 115/66
1B. SOLAR FORECAST
09 Jun 10 Jun 11 Jun
Activity R0, chance R1 R0, chance R1 R0, chance R1
Fadeouts None expected None expected None expected
10.7cm/SSN 115/66 115/66 115/66
COMMENT: Solar activity on UT day 08-Jun was R0, with no significant
solar flares. There are currently three numbered sunspots on
the solar disk. AR4105 (S15E10, beta) has shown some slight growth
in its leading spots, but decay in its trailing spots. AR4109
(S16E29, beta) has shown some slight growth but is mostly unchanged
from yesterday. AR4107 (S19W11, beta) is stable. Solar activity
is expected to be R0 over 9-11 Jun with a slight chance for R1.
Two CMEs were observed on UT day 08-Jun, but neither were considered
to be geoeffective. The first event from 0324 UT is considered
too slow to have any impact. The second event from 0724 UT originated
from a prominence that erupted from the southern solar polar
and swept out to the east, but is considered farside.
S0 solar radiation storm conditions were observed on UT day 08-Jun. S0
solar radiation storm conditions are expected over 09-11 Jun.
The solar wind on UT day 08-Jun was mildly disturbed due to ongoing
CME and coronal hole effects. The solar wind speed ranged from
390 to 450 km/s. The peak total interplanetary field strength
(IMF, Bt) was 16nT and the north-south IMF component range was
+12 to -9 nT, with some periods of southward Bz at the end of
the day. The solar wind environment is expected to slowly trend
towards background conditions over 9-10 Jun, but may increase
briefly on late 11-Jun due to an equatorial coronal hole.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 08 Jun: G0
Estimated Indices 08 Jun : A K
Australian Region 10 22112334
Cocos Island 10 12122334
Darwin 11 22212334
Townsville 10 22222324
Learmonth 10 22112334
Alice Springs 9 22112324
Gingin 13 22112335
Canberra 9 22012324
Kennaook Cape Grim 11 22013334
Hobart 10 21003334
Estimated Antarctic Regional K Indices 08 Jun :
Macquarie Island 14 11104533
Casey 16 33222335
Mawson 26 23523346
Observed Regional daily pc3 Indices 08 Jun :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 0 (Quiet)
Canberra 2 (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 08 Jun : A
Fredericksburg 13
Planetary 16
Observed AFr/Ap Indices 07 Jun : A K
Fredericksburg 20
Planetary 0 ---- ----
2B. MAGNETIC FORECAST
Date Ap Conditions
09 Jun 10 G0, slight chance G1
10 Jun 8 G0
11 Jun 10 G0, slight chance G1
COMMENT: ASWFC Geomagnetic Warning 42 was issued on 8 June and
is current for 8-9 Jun. G0 geomagnetic conditions were observed
in the Australian region on UT day 08-Jun. G0-G1 geomagnetic
conditions were observed in the Antarctic region. G0 geomagnetic
conditions are generally expected over 09-11 Jun, however a slight
chance for G1 is possible at the beginning of UT day 09-Jun due
to ongoing southward Bz conditions. Further chance of G1 is possible
by late 11-Jun due to expected coronal hole impacts.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
08 Jun Normal-fair Fair Fair-poor
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
09 Jun Normal Normal-fair Fair
10 Jun Normal Normal Normal-fair
11 Jun Normal-fair Normal Fair
COMMENT: HF radio propagation conditions were degraded in the
northern hemisphere on UT day 08-Jun, particularly in high latitudes.
Elsewhere over the globe had patchy conditions ranging from normal
to fair. HF radio conditions are expected to be mildly degraded
over 9-10 Jun on an improving trend, but may become further degraded
on late 11-Jun due to coronal hole activity.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
08 Jun 78
Observed Australian Regional MUFs
Cocos Island Region:
Near predicted monthly values during local day.
Depressed by 15% during local night.
Niue Island Region:
Depressed by 20% during local day.
Depressed by 25% during local night.
Northern Australian Region:
Near predicted monthly values during local day.
Depressed by 30% during local night.
Southern Australian Region:
Near predicted monthly values during local day.
Depressed by 35% during local night.
Depressed by 20% after local dawn.
Antarctic Region (Casey/Davis/Mawson):
Depressed by 25% 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
09 Jun 80 Near predicted monthly values/depressed 10 to
20%
10 Jun 90 Near predicted monthly values/depressed 10 to
15%
11 Jun 105 Near predicted monthly values
COMMENT: ASWFC HF Communications Warning 60 was issued on 8 June
and is current for 9-10 Jun. Maximum usable frequencies (MUFs)
in the Australian region on UT day 08-Jun were near predicted
values to 35% depressed, particularly in the southern region.
Spread-F was observed in Perth, Hobart and Canberra during local
night and dawn hours. Conditions in Hobart were poor. MUFs in
the Australian region over 09-11 Jun are expected to be initially
depressed by 20% but improving over the period.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 07 Jun
Daily Proton Fluence >1 MeV: 1.6E+06
Daily Proton Fluence >10 MeV: 1.7E+04
Daily Electron Fluence >2 MeV: 3.90E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 6%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B6.6
DSCOVR Satellite Solar Wind Day Averaged Data for 07 Jun
Speed: 420 km/sec Density: 5.2 p/cc Temp: 34400 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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