[Ips-dsgr] ASWFC Daily Report - 09 June 25 issued 2330 UT on 09 Jun 2025 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Tue Jun 10 09:30:57 AEST 2025
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/09 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 09 JUNE AND FORECAST FOR 10 JUNE - 12 JUNE
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: ** YELLOW **
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 09 Jun: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 09 Jun: 120/72
1B. SOLAR FORECAST
10 Jun 11 Jun 12 Jun
Activity R0, chance of R1 R0, chance of R1 R0, chance of R1
Fadeouts None expected None expected None expected
10.7cm/SSN 115/66 115/66 120/72
COMMENT: Solar activity on UT day 09-Jun was at the R0 level,
with no notable solar flares. There are currently five numbered
sunspot regions on the solar disk. Four of these showed spot
development over the UT day, AR4105 (S16W06, beta), AR4107 (S16W26,
beta), AR4109 (S17E10, beta) and AR4110 (N04E14, beta), although
none are magnetically complex or have recent flaring history.
The other region, newly numbered AR4111 (N14E67, alpha) was stable
over the 24 hour period. Solar activity is expected to be at
the R0 level over 10-12 Jun with a chance of R1. S0 solar radiation
storm conditions were observed on UT day 09-Jun. S0 solar radiation
storm conditions are expected over 10-12 Jun. Several faint and
slow CMEs were observed on 09-Jun, but none are considered geoeffective.
The solar wind speed on UT day 09-Jun was mostly steady mostly
ranging between 400 to 545 km/s, and is currently near 450 km/s.
The peak total interplanetary field strength (IMF, Bt) was 12
nT and the north-south IMF component range was +10 to -8 nT.
The solar wind environment is expected to slowly trend towards
background conditions on 10-Jun. An increase is expected late
on 11-Jun due to high speed wind stream effects from a small
equatorial coronal hole, approaching a geoeffective position.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 09 Jun: G0
Estimated Indices 09 Jun : A K
Australian Region 8 23212312
Cocos Island 6 23211221
Darwin 10 34222222
Townsville 11 34322212
Learmonth 10 33222322
Alice Springs 6 23212211
Gingin 9 33212322
Canberra 7 23212311
Kennaook Cape Grim 7 23212311
Hobart 8 23212312
Estimated Antarctic Regional K Indices 09 Jun :
Macquarie Island 10 23333212
Casey 12 34321322
Mawson 33 55433264
Observed Regional daily pc3 Indices 09 Jun :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 4 (Quiet)
Canberra 18 (Quiet)
Hobart 19 (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 09 Jun : A
Fredericksburg 17
Planetary 21
Observed AFr/Ap Indices 08 Jun : A K
Fredericksburg 0
Planetary 0 ---- ----
2B. MAGNETIC FORECAST
Date Ap Conditions
10 Jun 10 G0
11 Jun 12 G0, chance of G1
12 Jun 8 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 09-Jun. Mostly G0 geomagnetic conditions were
observed in the Antarctic region, with G2 conditions observed
at Mawson. G0 geomagnetic conditions are generally expected over
10-12 Jun, with a chance of G1 conditions on 11-Jun due to anticipated
high speed wind stream effects from an equatorial coronal hole,
approaching a geoeffective location.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
09 Jun Normal Normal-fair Poor-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
10 Jun Normal Normal Normal-fair
11 Jun Normal Normal Normal-fair
12 Jun Normal Normal Normal-fair
COMMENT: HF radio propagation conditions on 09-Jun were degraded
at high latitudes and mostly normal at low and mid latitudes.
HF radio conditions are expected to improve towards normal conditions
on 10-11 Jun, with some degradations possible late on 11-Jun
and on 12-Jun due to possible geomagnetic activity.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
09 Jun 89
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 25% during local day.
Depressed by 20% 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 20% during local night.
Southern Australian Region:
Depressed by 20% during local day.
Depressed by 25% during local night.
Antarctic Region (Casey/Davis/Mawson):
Depressed by 30% 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
10 Jun 80 Depressed 15%/near predicted monthly values
11 Jun 90 Near predicted monthly values
12 Jun 90 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 09-Jun were near predicted
values to 25% depressed during local night hours. Depressions
during daylight hours were also observed in the southern Australian
region. Spread-F was observed at Hobart and Canberra during local
night and dawn hours. MUFs in the Australian region over 10-Jun
are expected to be near predicted monthly values to depressed
by up to 20%. Conditions are expected to improve towards monthly
predicted values over 11-12 Jun.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 08 Jun
Daily Proton Fluence >1 MeV: 7.6E+05
Daily Proton Fluence >10 MeV: 1.5E+04
Daily Electron Fluence >2 MeV: 2.30E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 4%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B5.3
DSCOVR Satellite Solar Wind Day Averaged Data for 08 Jun
Speed: 429 km/sec Density: 6.0 p/cc Temp: 109000 K Bz: 3 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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