[Ips-dsgr] ASWFC Daily Report - 24 June 25 issued 2330 UT on 24 Jun 2025 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Wed Jun 25 09:30:50 AEST 2025
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/24 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 24 JUNE AND FORECAST FOR 25 JUNE - 27 JUNE
STATUS INDICATORS SOL:GREEN MAG:** YELLOW ** ION: ** YELLOW **
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 24 Jun: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 24 Jun: 120/72
1B. SOLAR FORECAST
25 Jun 26 Jun 27 Jun
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 120/72 125/78 130/84
COMMENT: Solar activity on UT day 24-Jun was R0. There is currently
no significant solar region on the visible solar disk. Solar
regions AR4117 (S14W11, beta) and nearby AR4118 (S13W02, beta)
have both further slightly declined. The largest flare was a
C3.1 from AR4117 at 24/1545UT. Other regions are very small.
Two of these smaller regions AR4120 (S11E18, beta) and AR4121
(N06W04, beta) are growing. There are currently five numbered
sunspot regions on the solar disk and a new small unnumbered
region. Solar activity is expected to be R0 over 25-27 Jun. No
Earth directed CMEs were observed in available imagery on UT
day 24-Jun. A sequence of narrow faint minor CMEs were observed
during the interval 24/0900-1400UT and are considered far side
activity. S0 solar radiation storm conditions were observed on
UT day 24-Jun. S0 solar radiation storm conditions are expected
over 25-27 Jun. A large equatorial coronal hole is just west
of the solar central meridian. The solar wind speed on 24-Jun
slightly increased. The solar wind speed ranged from 470 to 405
km/s and is currently at 450 km/s. The peak total interplanetary
field strength (IMF, Bt) was 8 nT and the north-south IMF component
range (Bz) was +5 to -6 nT. The solar wind environment is expected
to become further enhanced on 25-26 Jun due to a coronal hole
wind stream from the equatorial coronal hole.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 24 Jun: G0
Estimated Indices 24 Jun : A K
Australian Region 5 02222220
Cocos Island 3 01221210
Darwin 6 12222221
Townsville 3 1-------
Learmonth 5 12222220
Alice Springs 4 01222220
Gingin 6 12212320
Canberra 4 02212220
Kennaook Cape Grim 4 01212220
Hobart 5 01212320
Estimated Antarctic Regional K Indices 24 Jun :
Macquarie Island 3 00122210
Casey 11 23322241
Mawson 13 23332341
Observed Regional daily pc3 Indices 24 Jun :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 4 (Quiet)
Canberra 11 (Quiet)
Hobart 2 (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 24 Jun : A
Fredericksburg 8
Planetary 11
Observed AFr/Ap Indices 23 Jun : A K
Fredericksburg 8
Planetary 8 3213 2211
2B. MAGNETIC FORECAST
Date Ap Conditions
25 Jun 20 G1, chance G2 later in the UT day
26 Jun 20 G1, chance G2 early in the UT day
27 Jun 17 G0, chance G1 early in the UT day
COMMENT: ASWFC Geomagnetic Warning 47 was issued on 23 June and
is current for 24-26 Jun. G0 geomagnetic conditions were observed
on UT day 24-Jun in the Australian and Antarctic regions. A coronal
hole wind stream is expected to induce G1 geomagnetic activity
over 25-26 Jun.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
24 Jun Normal Normal-fair Fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
25 Jun Normal Normal-fair Fair
26 Jun Normal Fair-normal Fair
27 Jun Normal Normal-fair Fair
COMMENT: HF radio propagation conditions were fair to normal
on UT day 24-Jun. HF radio propagation conditions are expected
to be fair over 25-26 Jun for middle to high latitudes due to
anticipated geomagnetic activity induced by a coronal hole wind
stream. Normal HF conditions are expected at low latitudes.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
24 Jun 74
Observed Australian Regional MUFs
Cocos Island Region:
Near predicted monthly values during local day.
Depressed by 25% during local night.
Depressed by 25% after local dawn.
Niue Island Region:
Depressed by 15% during local day.
Depressed by 30% during local night.
Northern Australian Region:
Depressed by 15% during local day.
Depressed by 30% during local night.
Depressed by 20% after local dawn.
Southern Australian Region:
Depressed by 20% during local day.
Near predicted monthly values during local night.
Antarctic Region (Casey/Davis/Mawson):
Depressed by 15% 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
25 Jun 80 Depressed 10 to 15%/near predicted monthly values
26 Jun 65 Depressed 15 to 20%/near predicted monthly values
27 Jun 80 Depressed 10 to 15%/near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region on UT day 24-Jun were generally 15 to 30% depressed. Spread
F was observed at Canberra, Hobart and Brisbane during local
hight hours. Degraded HF conditions were observed in the Antarctic
region. MUFs are expected to be 10-20% depressed to near predicted
monthly values 25-26 Jun, with degraded HF conditions for the
southern Australian region over 25-26 Jun during local night
hours due to expected geomagnetic activity from a coronal hole
wind stream.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 23 Jun
Daily Proton Fluence >1 MeV: 1.1E+05
Daily Proton Fluence >10 MeV: 1.5E+04
Daily Electron Fluence >2 MeV: 4.90E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 7%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B6.7
DSCOVR Satellite Solar Wind Day Averaged Data for 23 Jun
Speed: 435 km/sec Density: 2.7 p/cc Temp: 93200 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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