[Ips-dsgr] ASWFC Daily Report - 22 June 26 issued 2335 UT on 22 Jun 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Tue Jun 23 09:35:38 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/22 JUNE 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 22 JUNE AND FORECAST FOR 23 JUNE - 25 JUNE
STATUS INDICATORS SOL:** YELLOW ** MAG:** YELLOW ** ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 22 Jun: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 22 Jun: 122/75
1B. SOLAR FORECAST
23 Jun 24 Jun 25 Jun
Activity Low to moderate Low to moderate Low to moderate
Fadeouts Possible Possible Possible
10.7cm/SSN 125/78 125/78 130/84
COMMENT: Solar activity on UT day 22-Jun remained at R0. There
are currently five numbered sunspot regions on the solar disk.
Active Region (AR) 4475 (S13E15, beta) is the newest, appearing
within the last 24 hours. Solar flare activity is expected to
be R1, chance R2 over 23-25 Jun. No Earth-directed CMEs were
observed on 22-Jun. S0 solar radiation storm conditions were
observed on UT day 22-Jun. S0 solar radiation storm conditions
are expected over 23-25 Jun. The solar wind environment on UT
day 22-Jun was near background levels. The solar wind speed ranged
between 335 to 380 km/s. The peak total interplanetary field
strength (IMF, Bt) was +7 to +1 nT. The north-south IMF component
(Bz) was +4 to -5 nT. The solar wind environment is expected
to remain mostly quiet over 23 Jun, with wind speeds beginning
to increase over 24-25 Jun due to several coronal holes.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 22 Jun: G0
Estimated Indices 22 Jun : A K
Australian Region 2 01011012
Cocos Island 2 11010012
Darwin 2 01011022
Townsville 4 12111022
Learmonth 4 01221022
Alice Springs 2 01011012
Gingin 3 11111012
Canberra 1 01011011
Kennaook Cape Grim 2 01012011
Hobart 1 01011011
Estimated Antarctic Regional K Indices 22 Jun :
Macquarie Island 0 00011000
Casey 5 13211111
Mawson 10 22211115
Observed Regional daily pc3 Indices 22 Jun :
Darwin NA
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 4 (Quiet)
Canberra 26 (Quiet to unsettled)
Hobart 6 (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 22 Jun : A
Fredericksburg 5
Planetary 5
Observed AFr/Ap Indices 21 Jun : A K
Fredericksburg 7
Planetary 5 1211 1111
2B. MAGNETIC FORECAST
Date Ap Conditions
23 Jun 6 G0
24 Jun 12 G0, chance G1
25 Jun 19 G1
COMMENT: G0 geomagnetic conditions were observed in the Australian
and Antarctic regions on UT day 22-Jun, with the exception of
a period of G1 in Mawson. G0 geomagnetic conditions are expected
over 23-Jun. There is a chance for an isolated period of G1 on
24-Jun due to coronal hole activity, with G1 conditions likely
on 25-Jun as more coronal holes become geoeffective.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
22 Jun Normal Normal Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
23 Jun Normal Normal Normal
24 Jun Normal Normal Normal-fair
25 Jun Normal Normal-fair Fair
COMMENT: HF radio propagation conditions on UT day 22-Jun were
mostly normal. HF radio propagation conditions are expected to
be normal over 23-Jun, but become mildly degraded by 24-Jun,
continuing through 25-Jun due to intermittent coronal hole connections
with Earth.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
22 Jun 71
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 15% during local night.
Antarctic Region (Casey/Davis/Mawson):
Enhanced by 20% 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
23 Jun 75 Near predicted monthly values
24 Jun 68 Near predicted monthly values
25 Jun 60 Near predicted monthly values
COMMENT: ASWFC SWF HF Communications Warning 55 was issued on
21 June and is current for 21-23 Jun. Maximum usable frequencies
(MUFs) in the Australian region on UT day 22-Jun were mostly
near predicted values, with enhancements of up to 15% seen in
the Southern Australian region. Spread-F was observed over much
of the Australian region during local night hours. Sporadic-E
was observed in Canberra. MUFs are expected to be mostly near
predicted monthly values over 23-25 Jun.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 21 Jun
Daily Proton Fluence >1 MeV: 3.44E+05
Daily Proton Fluence >10 MeV: 1.73E+04
Daily Electron Fluence >2 MeV: 2.82E+07
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B5.0
DSCOVR Satellite Solar Wind Day Averaged Data for 21 Jun
Speed: 374 km/sec Density: 4.8 p/cc Temp: 80700 K Bz: 2 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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