[Ips-dsgr] ASWFC Daily Report - 16 June 26 issued 2330 UT on 16 Jun 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Wed Jun 17 09:30:48 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/16 JUNE 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 16 JUNE AND FORECAST FOR 17 JUNE - 19 JUNE
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 16 Jun: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 16 Jun: 113/64
1B. SOLAR FORECAST
17 Jun 18 Jun 19 Jun
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 113/64 115/66 115/66
COMMENT: Solar flare activity on UT day 16-Jun was at the R0
level, with no significant flaring activity. There are currently
four numbered active regions (ARs) visible on the solar disk.
AR 4465 (N08W36, beta) is the largest region on the disk and
has shown mild decay over the UT day. Region 4469 (N08W36, beta)
has exhibited mild spot development. Newly numbered region 4470
(N05E70, beta) recently rotated over the eastern limb and appears
stable. All other regions are either stable or in decay. Solar
flare activity is expected to be at the R0 level over 17-19 Jun.
S0 solar radiation storm conditions were observed on UT day 16-Jun.
S0 solar radiation storm conditions are expected over 17-19 Jun.
No Earth-directed coronal mass ejections (CMEs) have been observed.
The solar wind speed on UT day 16-Jun decreased, ranging from
455 to 380 km/s and is currently near 410 km/s. The peak total
interplanetary magnetic field strength (IMF, Bt) was 9 nT and
the north-south IMF component (Bz) range was -8 to +8 nT. The
solar wind speed is expected to remain mildly elevated on 17-Jun,
then decline on 18-Jun. A mild increase in the solar wind speed
is expected on 19-Jun due to a narrow equatorial coronal hole.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 16 Jun: G0
Estimated Indices 16 Jun : A K
Australian Region 3 21111110
Cocos Island 2 11011110
Darwin 3 21111111
Townsville 4 22111111
Learmonth 4 21112210
Alice Springs 3 21111110
Gingin 4 21112210
Canberra 1 11001110
Kennaook Cape Grim 2 11011210
Hobart 3 11012210
Estimated Antarctic Regional K Indices 16 Jun :
Macquarie Island 1 00011110
Casey 8 33213210
Mawson 14 53213321
Observed Regional daily pc3 Indices 16 Jun :
Darwin NA
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 0 (Quiet)
Canberra 0 (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 16 Jun : A
Fredericksburg 7
Planetary 7
Observed AFr/Ap Indices 15 Jun : A K
Fredericksburg 6
Planetary 6 2212 1122
2B. MAGNETIC FORECAST
Date Ap Conditions
17 Jun 12 G0
18 Jun 8 G0
19 Jun 8 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
and planetary regions on UT day 16-Jun. Mostly G0 geomagnetic
conditions were observed in the Antarctic region, with an isolated
period of G1 observed at Mawson. G0 planetary geomagnetic conditions
are expected over 17-19 Jun.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
16 Jun Normal Normal-fair Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
17 Jun Normal Normal Normal-fair
18 Jun Normal Normal Normal-fair
19 Jun Normal Normal Normal
COMMENT: High frequency propagation conditions were mostly normal
on UT day 16-Jun, with some mild degradations observed in southern
hemisphere regions over the UT day. HF propagation conditions
are expected to be mostly normal over 17-18 Jun, with some mild
degradations possible in high latitude regions. Normal HF conditions
are expected on 19-Jun.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
16 Jun 77
Observed Australian Regional MUFs
Cocos Island Region:
No data available during local day.
No data available during local night.
Niue Island Region:
Enhanced by 15% during local day.
Depressed by 25% during local night.
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):
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
17 Jun 80 Near predicted monthly values
18 Jun 80 Near predicted monthly values
19 Jun 80 Near predicted monthly values
COMMENT: Maximum Usable Frequencies (MUFs) in the Australian
region were mostly near predicted monthly values on 16-Jun, with
15% enhancements observed in the southern Australian region.
Spread-F was observed at Hobart and Learmonth during local night
hours. MUFs are expected to be near predicted monthly values
over 17-19 Jun.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 15 Jun
Daily Proton Fluence >1 MeV: 4.6E+05
Daily Proton Fluence >10 MeV: 1.7E+04
Daily Electron Fluence >2 MeV: 6.40E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 8%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B5.5
DSCOVR Satellite Solar Wind Day Averaged Data for 15 Jun
Speed: 447 km/sec Density: 5.7 p/cc Temp: 128000 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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