[Ips-dsgr] ASWFC Daily Report - 28 June 25 issued 2330 UT on 28 Jun 2025 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sun Jun 29 09:30:55 AEST 2025
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/28 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 28 JUNE AND FORECAST FOR 29 JUNE - 01 JULY
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: ** YELLOW **
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 28 Jun: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 28 Jun: 122/75
1B. SOLAR FORECAST
29 Jun 30 Jun 01 Jul
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 120/72 115/66 115/66
COMMENT: Solar activity on UT day 28-Jun was R0. Solar region
AR4122 (N13E18, beta) grew slightly. Solar regions AR4117 (S14W66,
beta) and AR4120 (N06W62, beta) were stable. There are currently
eight solar regions on the visible solar disk. Other solar regions
are very small. Solar activity is expected to be R0 over 29-Jun
to 01-Jul. Old solar region AR4105 may return to the southeast
solar limb (S14) on 29-Jun, this region produced R1-R2 flares
on its previous solar disk transit but the region did show some
decay as it rotated off. No Earth directed CMEs have been observed.
S0 solar radiation storm conditions were observed on UT day 28-Jun.
S0 solar radiation storm conditions are expected over 29-Jun
to 01-Jul The solar wind speed is currently elevated with a declining
trend due to a solar coronal hole wind stream. The solar wind
speed ranged from 685 to 574 km/s and is currently near 600 km/s.
The peak total interplanetary field strength (IMF, Bt) was 5
nT and the north-south IMF component range (Bz) was +4 to -4
nT. The solar wind is expected to further gradually decline in
coming days. The US GOES satellite is currently measuring an
elevated flux of electrons with an energy of >2MeV which can
increase the satellite internal charging risk for geosynchronous
satellites.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 28 Jun: G0
Estimated Indices 28 Jun : A K
Australian Region 7 12332112
Cocos Island 5 12321111
Darwin 8 22332112
Townsville 8 22332121
Learmonth 9 12432122
Alice Springs 7 12332112
Gingin 8 12332222
Canberra 8 12432111
Kennaook Cape Grim 9 22432111
Hobart 9 12432112
Estimated Antarctic Regional K Indices 28 Jun :
Macquarie Island 21 21564111
Casey 10 33332122
Mawson 22 34543234
Observed Regional daily pc3 Indices 28 Jun :
Darwin 8 (Quiet)
Townsville 0 (Quiet)
Learmonth 6 (Quiet)
Alice Springs 2 (Quiet)
Gingin 46 (Unsettled)
Canberra 48 (Unsettled)
Hobart 43 (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 28 Jun : A
Fredericksburg 13
Planetary 15
Observed AFr/Ap Indices 27 Jun : A K
Fredericksburg 16
Planetary 16 5443 3223
2B. MAGNETIC FORECAST
Date Ap Conditions
29 Jun 10 G0
30 Jun 8 G0
01 Jul 6 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 28-Jun. G0-G2 geomagnetic conditions were observed
in the Antarctic region. G0 geomagnetic conditions are generally
expected over 29-Jun to 01-Jul.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
28 Jun Normal Fair-normal Fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
29 Jun Normal Normal Normal-fair
30 Jun Normal Normal Normal-fair
01 Jul Normal Normal Normal
COMMENT: HF radio propagation conditions were fair to normal
on UT day 28-Jun, with degraded conditions at high latitudes
at times. HF radio propagation conditions are expected gradually
improve, with fair to normal conditions expected for 29-30 Jun
and normal conditions on 01-Jul.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
28 Jun 66
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 25% during local day.
Depressed by 30% during local night.
Niue Island Region:
Depressed by 15% during local day.
Depressed by 30% during local night.
Northern Australian Region:
Depressed by 20%.
Southern Australian Region:
Depressed 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 94
Jun 109
Jul 107
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
29 Jun 85 Depressed 15 to 20%/near predicted monthly values
30 Jun 85 Depressed 15 to 20%/near predicted monthly values
01 Jul 85 Depressed 15 to 20%/near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region on UT day 28-Jun were 20% depressed to near predicted
values. Spread-F was observed at Darwin, Hobart and Norfolk Island
during local night hours. MUFs are expected to be 15-20% depressed
to near predicted values over 29-Jun to 01-Jul.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 27 Jun
Daily Proton Fluence >1 MeV: 4.8E+06
Daily Proton Fluence >10 MeV: 1.6E+04
Daily Electron Fluence >2 MeV: 7.50E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 9%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B5.1
DSCOVR Satellite Solar Wind Day Averaged Data for 27 Jun
Speed: 709 km/sec Density: 1.5 p/cc Temp: 256000 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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