[Ips-dsgr] ASWFC Daily Report - 27 June 25 issued 2330 UT on 27 Jun 2025 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sat Jun 28 09:30:58 AEST 2025
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/27 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 27 JUNE AND FORECAST FOR 28 JUNE - 30 JUNE
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: ** YELLOW **
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 27 Jun: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 27 Jun: 118/70
1B. SOLAR FORECAST
28 Jun 29 Jun 30 Jun
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 120/72 120/72 115/66
COMMENT: Solar activity on UT day 27-Jun was R0. There is currently
no solar region of significance on the visible solar disk. All
regions are relatively small. Solar region AR4122 (N13E31, beta)
continues to grow, with small intermediate spots starting to
emerge. Solar region AR4120 (N06W46, beta) has grown slightly.
Solar region AR4117 (S14W53, beta) continues to slowly decay
and solar region AR4118 (S13W44, beta) has now almost completely
decayed. New small region AR4125 (N25E78, alpha) has rotated
onto the disk. There are currently eight numbered sunspot regions
on the solar disk. All other sunspot regions are either stable
or in decay. A 15 degree long solar filament located at N22W70
erupted at 27/1149UT. Solar activity is expected to be R0 over
28-30 Jun. No significantly Earth directed CMEs have been observed.
A northwest CME was observed in LASCO C2 imagery from 27/1200UT
associated with the filament eruption in the northwest solar
quadrant. This CME has been modelled as an Earth miss with the
CME passing ahead of the Earth. S0 solar radiation storm conditions
were observed on UT day 27-Jun. S0 solar radiation storm conditions
are expected over 28-30 Jun. The solar wind speed is currently
elevated due to a solar coronal hole wind stream from a coronal
hole in the western solar hemisphere. The solar wind speed ranged
from 806 to 660 km/s and is currently near 670 km/s. The peak
total interplanetary field strength (IMF, Bt) was 6 nT and the
north-south IMF component range (Bz) was +6 to -5 nT. The solar
wind is expected to gradually decline in coming days.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 27 Jun: G0
Estimated Indices 27 Jun : A K
Australian Region 11 33333121
Cocos Island 7 32322011
Darwin 11 33333122
Townsville 11 32343111
Learmonth 15 33434222
Alice Springs 10 33333111
Gingin 13 33334222
Canberra 12 32443111
Kennaook Cape Grim 16 33444221
Hobart 18 33454221
Estimated Antarctic Regional K Indices 27 Jun :
Macquarie Island 23 44455211
Casey 16 33335222
Mawson 51 75543256
Observed Regional daily pc3 Indices 27 Jun :
Darwin 2 (Quiet)
Townsville 4 (Quiet)
Learmonth 14 (Quiet)
Alice Springs 0 (Quiet)
Gingin 99 (Minor storm)
Canberra 85 (Minor storm)
Hobart 87 (Minor storm)
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 27 Jun : A
Fredericksburg 21
Planetary 24
Observed AFr/Ap Indices 26 Jun : A K
Fredericksburg 24
Planetary 24 4343 4445
2B. MAGNETIC FORECAST
Date Ap Conditions
28 Jun 14 G0
29 Jun 10 G0
30 Jun 8 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 27-Jun. G0-G3 geomagnetic conditions were observed
in the Antarctic region. G0 geomagnetic conditions are generally
expected over 28-30 Jun. Whilst the solar wind is currently strong
little geomagnetic activity is being induced as the interplanetary
magnetic field is small (current IMF Bt magnitude of 3nT).
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
27 Jun Normal Fair-normal Poor-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
28 Jun Normal Fair-normal Fair
29 Jun Normal Fair-normal Fair-normal
30 Jun Normal Fair-normal Fair-normal
COMMENT: HF radio propagation conditions were poor to normal
on UT day 27-Jun, with degraded conditions at high latitudes
at times. HF radio propagation conditions are expected to be
fair to normal for 28-30 Jun. HF conditions for middle to high
latitudes are expected to gradually improve.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
27 Jun 74
Observed Australian Regional MUFs
Cocos Island Region:
Near predicted monthly values during local day.
Depressed by 25% during local night.
Niue Island Region:
Near predicted monthly values during local day.
Depressed by 35% during local night.
Depressed by 20% after local dawn.
Northern Australian Region:
Depressed by 15% during local day.
Depressed by 35% during local night.
Depressed by 30% after local dawn.
Southern Australian Region:
Depressed by 15% during local day.
Near predicted monthly values during local night.
Antarctic Region (Casey/Davis/Mawson):
Depressed by 45% 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
28 Jun 85 Depressed 15 to 25%/near predicted monthly values
29 Jun 85 Depressed 15 to 25%/near predicted monthly values
30 Jun 85 Depressed 15 to 25%/near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region on UT day 27-Jun were 35% depressed to near predicted
values. Spread-F was observed at Townsville and Hobart during
local night hours. Persistent blanketing sporadic E was observed
at Mawson in Antarctica. MUFs are expected to be near predicted
values to 15-25% depressed over 28-30 Jun.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 26 Jun
Daily Proton Fluence >1 MeV: 2.7E+05
Daily Proton Fluence >10 MeV: 1.5E+04
Daily Electron Fluence >2 MeV: 1.20E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 2%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B4.9
DSCOVR Satellite Solar Wind Day Averaged Data for 26 Jun
Speed: 683 km/sec Density: 2.5 p/cc Temp: 374000 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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