[Ips-dsgr] ASWFC Daily Report - 11 June 26 issued 2330 UT on 11 Jun 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Fri Jun 12 09:30:49 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/11 JUNE 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 11 JUNE AND FORECAST FOR 12 JUNE - 14 JUNE
STATUS INDICATORS SOL:** YELLOW ** MAG:** RED ** ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 11 Jun: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 11 Jun: 127/80
1B. SOLAR FORECAST
12 Jun 13 Jun 14 Jun
Activity R0-R1 R0-R1 R0-R1
Fadeouts Possible Possible Possible
10.7cm/SSN 128/81 128/81 125/78
COMMENT: Solar activity on UT day 11-Jun was R0. There are currently
five numbered sunspot regions on the solar disk. Active region
(AR) 4464 (S13W16, beta) has shown some growth over the past
day. All other sunspots have either shown only minor changes
to their trailing spots or else are in decay. Solar activity
over 12-14 Jun is expected to be R0-R1.
A partial halo CME was launched from the Sun from 11/0126 UT,
associated with a C6 class solar flare from AR 4465 (N09E30, beta).
The bulk of this CME is expected to pass behind the Earth, but a
glancing blow is expected at the beginning of 13-Jun UT day from 0000 UT.
No other CMEs were observed on 11-Jun.
S0 solar radiation storm conditions were observed on UT day 11-Jun.
S0 solar radiation storm conditions are expected over 12-14 Jun.
The solar wind environment on UT day 11-Jun was mildly disturbed,
due to a passing CME launched from 9-Jun. The solar wind speed ranged from
400 km/s trending to 500 km/s. The peak total interplanetary field strength
(IMF,
Bt) was 15 nT and the north-south IMF component range (Bz) ranged
between +13 to -12 nT, with some brief southward periods towards
the end of the day. A recurrent coronal hole wind stream is expected
to connect with the Earth on UT day 12-Jun to enhance solar wind
speeds, followed by a CME glancing blow early on 13-Jun. These
disturbances are expected to begin subsiding on 14-Jun.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 11 Jun: G0
Estimated Indices 11 Jun : A K
Australian Region 9 02222243
Cocos Island 7 02222232
Darwin 9 12322233
Townsville 12 12322244
Learmonth 10 12222243
Alice Springs 10 12222243
Gingin 11 02231144
Canberra 9 02231143
Kennaook Cape Grim 11 02231144
Hobart 9 02231143
Estimated Antarctic Regional K Indices 11 Jun :
Macquarie Island 13 01451033
Casey 17 14322154
Mawson 40 33443176
Observed Regional daily pc3 Indices 11 Jun :
Darwin NA
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 4 (Quiet)
Canberra 4 (Quiet)
Hobart 14 (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 11 Jun : A
Fredericksburg 14
Planetary 17
Observed AFr/Ap Indices 10 Jun : A K
Fredericksburg 7
Planetary 7 2113 3112
2B. MAGNETIC FORECAST
Date Ap Conditions
12 Jun 25 G1, chance G2
13 Jun 35 G2
14 Jun 20 G1, chance G2
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 11-Jun in the Australian region. G1-G3 geomagnetic
conditions were observed in the Antarctic region. Planetary conditions
reached G1 during the last period of the day. G1, with a chance
chance for G2 geomagnetic conditions are expected on UT day 12-Jun
due to the anticipated entry into a coronal hole wind stream.
A glancing blow from a CME launched on 11-Jun is expected to
arrive from 13/0000 UT to cause G2 geomagnetic conditions on
13-Jun. Residual disturbances are expected to carry into 14-Jun,
with G1 conditions likely with a chance for G2 periods on this
day.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
11 Jun Normal-fair Normal Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
12 Jun Normal-fair Normal-fair Normal-fair
13 Jun Normal-fair Fair Fair
14 Jun Normal-fair Normal-fair Fair
COMMENT: HF radio propagation conditions on UT day 11-Jun were
mostly normal, with some mild degradations in the southern hemisphere.
HF radio propagation conditions are expected to become mildly
degraded on UT day 12-Jun due to anticipated geomagnetic activity
from a coronal hole; further degradations are then expected on
13-Jun due to the addition of a CME glancing blow to Earth. Residual
degradations are expected on 14-Jun but may begin recovering
by end of the day.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
11 Jun 83
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.
Near predicted monthly values during local night.
Northern Australian Region:
Mostly near predicted monthly values.
Southern Australian Region:
Mostly 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
12 Jun 80 Near predicted monthly values
13 Jun 60 Near predicted monthly values to 15% depressed
14 Jun 65 Near predicted monthly values to 15% depressed
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region on UT day 11-Jun were mostly near predicted values. Sporadic-E
and generally degraded HF conditions were observed at northern
Australian region sites such as Learmonth, Darwin and Niue Island.
MUFs are expected to be near predicted values on 12-UT to 10%
depressed due to the expected geomagnetic activity from a coronal
hole. Further depressions of 15% are expected by 13-UT which
are likely to carry into 14-Jun.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 10 Jun
Daily Proton Fluence >1 MeV: 1.4E+06
Daily Proton Fluence >10 MeV: 1.8E+04
Daily Electron Fluence >2 MeV: 3.60E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 5%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B6.3
DSCOVR Satellite Solar Wind Day Averaged Data for 10 Jun
Speed: 397 km/sec Density: 8.7 p/cc Temp: 52800 K Bz: 0 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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