[Ips-dsgr] ASWFC Daily Report - 19 June 26 issued 2330 UT on 19 Jun 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sat Jun 20 09:30:50 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/19 JUNE 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 19 JUNE AND FORECAST FOR 20 JUNE - 22 JUNE
STATUS INDICATORS SOL:** YELLOW ** MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 19 Jun: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 19 Jun: 111/62
1B. SOLAR FORECAST
20 Jun 21 Jun 22 Jun
Activity Low Low to moderate Low to moderate
Fadeouts R0 R0-R1 R0-R1
10.7cm/SSN 112/63 115/66 120/72
COMMENT: Solar activity on UT day 19-Jun was R0, with no solar
flares. There are currently four numbered sunspot regions on
the solar disk. All sunspot regions are currently either stable
or in decay. Solar activity is expected to be R0 on 20-Jun, with
a chance for R1 flares over 21-22 Jun as new active region (AR)
4472 (S12E67, beta) rotates into view.
No Earth-directed CMEs were observed on UT day 19-Jun.
S0 solar radiation storm conditions were observed on UT day 19-Jun.
S0 solar radiation storm conditions are expected over 20-22 Jun.
The solar wind environment on UT
day 19-Jun was steady. The solar wind speed ranged from 350 to
near 430 km/s. The peak total interplanetary field strength (IMF,
Bt) was 11 nT and the north-south IMF component range (Bz) was
+9 to -7 nT. The solar wind environment is expected to remain
near background levels over 20-22 Jun.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 19 Jun: G0
Estimated Indices 19 Jun : A K
Australian Region 2 12120000
Cocos Island 2 11120000
Darwin 1 11110001
Townsville 3 12211001
Learmonth 3 22120000
Alice Springs 2 12110000
Gingin 3 22120010
Canberra 2 12110000
Kennaook Cape Grim 2 12120000
Hobart 2 11121000
Estimated Antarctic Regional K Indices 19 Jun :
Macquarie Island 2 11030000
Casey 5 22221111
Mawson 11 44222122
Observed Regional daily pc3 Indices 19 Jun :
Darwin NA
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 0 (Quiet)
Canberra 0 (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 19 Jun : A
Fredericksburg 8
Planetary 10
Observed AFr/Ap Indices 18 Jun : A K
Fredericksburg 7
Planetary 6 2211 1113
2B. MAGNETIC FORECAST
Date Ap Conditions
20 Jun 5 G0
21 Jun 4 G0
22 Jun 4 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 19-Jun. G0 geomagnetic conditions were observed
in the Antarctic region. G0 geomagnetic conditions are expected
over 20-22 Jun.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
19 Jun Normal-fair Normal-fair Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
20 Jun Normal-fair Normal Normal
21 Jun Normal Normal Normal
22 Jun Normal Normal Normal
COMMENT: HF radio propagation conditions on UT day 19-Jun were
mostly normal, with some mildly degraded conditions across the
southern hemisphere throughout the day. HF radio propagation
conditions are expected to be mostly normal over 20-22 Jun.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
19 Jun 75
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.
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
20 Jun 75 Near predicted monthly values
21 Jun 75 Near predicted monthly values
22 Jun 75 Near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region on UT day 19-Jun were near predicted values. Spread-F
was observed in Hobart and Learmonth during local night and dawn
hours. MUFs are expected to be near predicted values over 20-22
Jun.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 18 Jun
Daily Proton Fluence >1 MeV: 5.5E+05
Daily Proton Fluence >10 MeV: 1.7E+04
Daily Electron Fluence >2 MeV: 5.20E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 7%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B3.9
DSCOVR Satellite Solar Wind Day Averaged Data for 18 Jun
Speed: 395 km/sec Density: 7.0 p/cc Temp: 67000 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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