[Ips-dsgr] ASWFC Daily Report - 24 June 26 issued 2330 UT on 24 Jun 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Thu Jun 25 09:30:51 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/24 JUNE 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 24 JUNE AND FORECAST FOR 25 JUNE - 27 JUNE
STATUS INDICATORS SOL:** YELLOW ** MAG:** YELLOW ** ION: GREEN
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: 137/91
1B. SOLAR FORECAST
25 Jun 26 Jun 27 Jun
Activity R0-R1, chance R2 R0-R1, chance R2 R0-R1, chance R2
Fadeouts Possible Possible Possible
10.7cm/SSN 140/94 140/94 140/94
COMMENT: Solar activity on UT day 24-Jun was R0, with no significant
solar flares. There are currently seven numbered sunspot regions
on the solar disk. All numbered sunspots are generally stable
with only showing small movements in trailing regions. A new
sunspot region is currently rotating over from the eastern limb
which appears to have high magnetic complexity, however cannot
yet be fully analysed due to limited visibility. Solar activity is
expected to be R0-R1, chance R2 over 25-27 Jun, with potential
for upgrading due to the new region, however this has yet to
be seen.
No Earth-directed CMEs were observed on UT day 24-Jun.
S0 solar radiation storm conditions were observed on UT day 24-Jun.
S0 solar radiation storm conditions are expected over 25-27 Jun.
The solar wind environment on UT day 24-Jun was on a steady incline.
The solar wind speed ranged from 360 to 630 km/s. The peak total
interplanetary field strength (IMF, Bt) was 13 nT and the north-south
IMF component range (Bz) was +7 to -8 nT. The solar wind is expected
to be mostly near background levels over 25-26 Jun, with increase
in wind speeds expected by either late 26-Jun or else on 27-Jun
due to an approaching 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 12 21223433
Cocos Island 9 11222333
Darwin 11 21323333
Townsville 13 21323433
Learmonth 13 21323433
Alice Springs 13 21323433
Gingin 11 11223433
Canberra 10 21223333
Kennaook Cape Grim 11 11223433
Hobart 10 11223432
Estimated Antarctic Regional K Indices 24 Jun :
Macquarie Island 17 00244533
Casey 14 33323333
Mawson 24 14333346
Observed Regional daily pc3 Indices 24 Jun :
Darwin NA
Townsville 2 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 4 (Quiet)
Gingin 13 (Quiet)
Canberra 19 (Quiet)
Hobart 34 (Quiet to 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 24 Jun : A
Fredericksburg 12
Planetary 15
Observed AFr/Ap Indices 23 Jun : A K
Fredericksburg 8
Planetary 7 1012 2331
2B. MAGNETIC FORECAST
Date Ap Conditions
25 Jun 8 G0
26 Jun 14 G0
27 Jun 18 G0, chance G1
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 24-Jun. G0-G1 geomagnetic conditions were observed
in the Antarctic region. G0 geomagnetic conditions are expected
over 25-26 Jun. Periods of G1 are possible on 27-Jun due to the
anticipated connection with an approaching coronal hole.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
24 Jun Normal Normal Fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
25 Jun Normal Normal Normal
26 Jun Normal Normal Normal
27 Jun Normal Normal-fair Fair
COMMENT: HF radio propagation conditions on UT day 24-Jun were
mostly normal. HF radio propagation conditions are expected to
be mostly normal over 25-26 Jun. Conditions may become mildly
degraded by 27-Jun due to an anticipated coronal hole wind stream.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
24 Jun 84
Observed Australian Regional MUFs
Cocos Island Region:
No data available during local day.
No data available during local night.
Niue Island Region:
Near predicted monthly values.
Northern Australian Region:
Near predicted monthly values.
Southern Australian Region:
Near predicted monthly values during local day.
Enhanced by 25% during local night.
Antarctic Region (Casey/Davis/Mawson):
Near predicted monthly values over the UT day.
Monthly T index:
Month T index
May 67
Jun 68
Jul 65
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
25 Jun 75 Near predicted monthly values
26 Jun 75 Near predicted monthly values
27 Jun 70 Near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) on UT day 24-Jun were
mostly near predicted monthly values to 25% enhanced. MUFs are
expected to be mostly near predicted values over 25-27 Jun. Some
spread-F and mildly degraded conditions may be observed on 27-Jun
due to anticipated coronal hole activity.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 23 Jun
Daily Proton Fluence >1 MeV: 5.2E+05
Daily Proton Fluence >10 MeV: 1.7E+04
Daily Electron Fluence >2 MeV: 2.10E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 4%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B7.9
DSCOVR Satellite Solar Wind Day Averaged Data for 23 Jun
Speed: 364 km/sec Density: 6.1 p/cc Temp: 59000 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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