[Ips-dsgr] ASWFC Daily Report - 12 June 26 issued 2347 UT on 12 Jun 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sat Jun 13 09:47:17 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/12 JUNE 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 12 JUNE AND FORECAST FOR 13 JUNE - 15 JUNE
STATUS INDICATORS SOL:** YELLOW ** MAG:** RED ** ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 12 Jun: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 12 Jun: 128/81
1B. SOLAR FORECAST
13 Jun 14 Jun 15 Jun
Activity R0, chance of R1 R0, chance of R1 R0, chance of R1
Fadeouts Possible Possible Possible
10.7cm/SSN 128/81 125/78 122/75
COMMENT: Solar flare activity on UT day 12-Jun was at the R0
level. There are currently five numbered sunspot regions on the
solar disk. All regions are currently exhibiting simple magnetic
characteristics. Active Region (AR) 4465 (N09E17, beta) produced
the largest C-class flare of the UT day. All ARs are stable or
in decay. Solar flare activity over 13-15 Jun is expected to
be at the R0 level, with a chance of R1. S0 solar radiation storm
conditions were observed on UT day 12-Jun. S0 solar radiation
storm conditions are expected over 13-15 Jun. No significantly
geoeffective CMEs have been observed on 12-Jun. A faint east
directed CME is visible in SOHO and STEREO-A imagery from 12/1638UT,
analysis of this event is ongoing. An east directed CME is visible
in SOHO imagery form 12/1936UT. An associated eruption on the
eastern limb at around S11 is visible in GOES SUVI and SDO imagery
from 12/1904UT. This CME is expected to pass behind the Earth.
The solar wind environment on UT day 12-Jun was disturbed, with
a strong increase in solar wind speed due to coronal hole high
speed wind stream effects. The solar wind speed mostly ranged
between 500 km/s and 650 km/s and is currently at around 580
km/s. The peak total interplanetary field strength (IMF, Bt)
was 17 nT and the north-south IMF component range (Bz) ranged
between +11 to -8 nT. A glancing CME impact is expected to further
enhance the solar wind environment on 13-Jun. The solar wind
speed is expected to be strong to very strong over 13-15 Jun,
with a gradual decline over the period.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 12 Jun: G0
Estimated Indices 12 Jun : A K
Australian Region 10 23333122
Cocos Island 6 22222121
Darwin 9 22333121
Townsville 10 23333122
Learmonth 12 23343222
Alice Springs 9 22333122
Gingin 13 23244222
Canberra 10 12343122
Kennaook Cape Grim 14 23344222
Hobart 13 23344122
Estimated Antarctic Regional K Indices 12 Jun :
Macquarie Island 37 13476332
Casey 13 43333222
Mawson 46 56644355
Observed Regional daily pc3 Indices 12 Jun :
Darwin NA
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 21 (Quiet to unsettled)
Canberra 8 (Quiet)
Hobart 38 (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 12 Jun : A
Fredericksburg 17
Planetary 21
Observed AFr/Ap Indices 11 Jun : A K
Fredericksburg 16
Planetary 18 1233 2254
2B. MAGNETIC FORECAST
Date Ap Conditions
13 Jun 30 G1-G2
14 Jun 16 G0, chance of G1
15 Jun 8 G0
COMMENT: ASWFC Geomagnetic Warning 37 was issued on 11 June and
is current for 12-14 Jun. G0 geomagnetic conditions were observed
on UT day 12-Jun in the Australian region and at the planetary
level. Mostly G2 geomagnetic conditions were observed in the
Antarctic region. G1-G2 geomagnetic conditions are expected on
13-Jun due to ongoing coronal hole high speed wind stream effects
and an anticipated glancing impact from a CME first observed
on 11-Jun. Conditions are expected to ease over 14-15 Jun with
a chance of G1 on 14-Jun and G0 conditions expected on 15-Jun.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
12 Jun Normal Normal-fair Fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
13 Jun Fair Fair Fair-poor
14 Jun Normal Normal-fair Fair
15 Jun Normal Normal Normal-fair
COMMENT: HF radio propagation conditions on UT day 11-Jun were
mostly normal, with some mild degradations at high latitudes
and at equatorial latitudes near the end of the UT day. HF radio
propagation conditions are expected to be degraded on 13-Jun
due to anticipated geomagnetic activity, mostly at higher latitudes.
With conditions then easing over 14-15 Jun towards normal conditions.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
12 Jun 86
Observed Australian Regional MUFs
Cocos Island Region:
No data available during local day.
No data available during local night.
Niue Island Region:
Enhanced by 20% during local day.
Near predicted monthly values 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
13 Jun 75 Near predicted monthly values/depressed to 15%
14 Jun 75 Near predicted monthly values/depressed to 15%
15 Jun 80 Near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region on UT day 12-Jun were mostly near predicted values. Spread
F was observed at Hobart, Canberra and Perth during local night
hours. MUFs are expected to be generally near predicted monthly
values over 13-15 Jun, with a chance of mild depressions on 13-14
Jun due to anticipated geomagnetic activity.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 11 Jun
Daily Proton Fluence >1 MeV: 1.1E+06
Daily Proton Fluence >10 MeV: 1.7E+04
Daily Electron Fluence >2 MeV: 1.70E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 3%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B6.5
DSCOVR Satellite Solar Wind Day Averaged Data for 11 Jun
Speed: 397 km/sec Density: 12.9 p/cc Temp: 88600 K Bz: 3 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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