[Ips-dsgr] ASWFC Daily Report - 23 June 25 issued 2330 UT on 23 Jun 2025 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Tue Jun 24 09:30:49 AEST 2025
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/23 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 23 JUNE AND FORECAST FOR 24 JUNE - 26 JUNE
STATUS INDICATORS SOL:GREEN MAG:** YELLOW ** ION: ** YELLOW **
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 23 Jun: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 23 Jun: 122/75
1B. SOLAR FORECAST
24 Jun 25 Jun 26 Jun
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 120/72 120/72 125/78
COMMENT: Solar activity on UT day 23-Jun was R0, with no significant
solar flares. Solar regions AR4117 (S14E02, beta) and nearby
AR4118 (S13E11, beta) have both slightly declined. Solar region
AR4115 (N20W76, beta) is about to rotate off disk and produced
a C5 flare at 23/1223UT, which was the largest flare for the
day. Other regions are very small. There are currently six numbered
sunspot regions on the solar disk. Solar activity is expected
to be R0 over 24-26 Jun. No Earth directed CMEs were observed
in available imagery on UT day 23-Jun. S0 solar radiation storm
conditions were observed on UT day 23-Jun. S0 solar radiation
storm conditions are expected over 24-26 Jun. A large equatorial
coronal hole is currently crossing the solar central meridian.
The solar wind speed on 23-Jun slightly declined. The solar wind
speed ranged from 527 to 417 km/s and is currently at 430 km/s.
The peak total interplanetary field strength (IMF, Bt) was 6
nT and the north-south IMF component range (Bz) was +5 to -6
nT. The solar wind environment is expected to become enhanced
from late 24-Jun and on 25 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 23 Jun: G0
Estimated Indices 23 Jun : A K
Australian Region 4 22121110
Cocos Island 3 21121100
Darwin 4 22111111
Townsville 4 22121111
Learmonth 5 32111210
Alice Springs 3 22111100
Gingin 3 22111110
Canberra 3 21121100
Kennaook Cape Grim 4 21121210
Hobart 3 21121100
Estimated Antarctic Regional K Indices 23 Jun :
Macquarie Island 4 21132100
Casey 7 33221111
Mawson 29 64333254
Observed Regional daily pc3 Indices 23 Jun :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 0 (Quiet)
Canberra 7 (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 23 Jun : A
Fredericksburg 10
Planetary 11
Observed AFr/Ap Indices 22 Jun : A K
Fredericksburg 8
Planetary 0 ---- ----
2B. MAGNETIC FORECAST
Date Ap Conditions
24 Jun 18 G0, increasing to G1 late in the UT day
25 Jun 25 G1, chance G2
26 Jun 16 G0, chance G1
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 23-Jun in the Australian region. G0-G2 geomagnetic
conditions were observed in the Antarctic region. A coronal hole
wind stream is expected to induce G1 geomagnetic activity on
25-Jun.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
23 Jun Normal Normal-fair Fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
24 Jun Normal Normal-fair Fair
25 Jun Normal Fair Fair-poor
26 Jun Normal Normal-fair Fair
COMMENT: HF radio propagation conditions were fair to normal
on UT day 23-Jun. HF radio propagation conditions are expected
to be normal to fair on 24-Jun, then becoming degraded, particularly
during local nighttime hours on 25-Jun for middle to high latitudes
due to anticipated geomagnetic activity induced by a coronal
hole wind stream.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
23 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.
Near predicted monthly values 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 20% over the UT day.
Sporadic E and spread F frequently observed.
Monthly T index:
Month T index
May 94
Jun 109
Jul 107
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
24 Jun 90 Depressed 10 to 15%/near predicted monthly values
25 Jun 80 Depressed 10 to 15%/near predicted monthly values
26 Jun 65 Depressed 15 to 20%/near predicted monthly values
COMMENT: ASWFC HF Communications Warning 67 was issued on 21
June and is current for 22-24 Jun. Maximum usable frequencies
(MUFs) in the Australian region on UT day 23-Jun were generally
15 to 30% depressed. Spread F was observed at Canberra, Townsville,
Hobart and Norfolk Island during local hight hours. Antarctic
HF conditions were degraded. MUFs are expected to be 10-15% depressed
to near predicted monthly values 24-25 Jun, with degraded HF
conditions for the southern Australian region on 25-Jun during
local night hours due to expected geomagnetic activity from a
coronal hole wind stream. Southern Australian region MUFs are
expected to be 15 to 20% depressed on 26-Jun.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 22 Jun
Daily Proton Fluence >1 MeV: 1.8E+05
Daily Proton Fluence >10 MeV: 1.5E+04
Daily Electron Fluence >2 MeV: 2.80E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 4%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B6.1
DSCOVR Satellite Solar Wind Day Averaged Data for 22 Jun
Speed: 483 km/sec Density: 2.0 p/cc Temp: 152000 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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