[Ips-dsgr] ASWFC Daily Report - 02 June 26 issued 2330 UT on 02 Jun 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Wed Jun 3 09:30:50 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/02 JUNE 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 02 JUNE AND FORECAST FOR 03 JUNE - 05 JUNE
STATUS INDICATORS SOL:** YELLOW ** MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 02 Jun: R1
Flares Max Fadeout Freq. Sectors
M1.2 0445UT possible lower E. Asia/Aust.
M1.2 1005UT possible lower European
M3.3 1650UT possible lower South American/
Atlantic
Observed 10.7 cm flux/Equivalent Sunspot Number for 02 Jun: 146/100
1B. SOLAR FORECAST
03 Jun 04 Jun 05 Jun
Activity R0-R1 R0-R1 R0-R1
Fadeouts Possible Possible Possible
10.7cm/SSN 150/105 152/107 145/99
COMMENT: Solar flare activity on UT day 02-Jun was at the R1
level due to three M-class flares, the largest of which was an
M3.3 flare at 02/1650UT produced by Active Region (AR) 4455 (N09W05,
beta-gamma). This region also produced an M1.2 flare at 02/1005UT.
There are currently eight numbered active regions visible on
the solar disk. AR 4455 is the largest and most magnetically
complex region on the disk and has exhibited spot development
in its leader spots over the UT day. Regions 4457 (S10W40, beta)
and 4460 (S25W60, beta) have shown spot growth. AR 4459 (N10E47,
beta) has shown growth in its trailing spot. Newly numbered regions
4461 (S22E72, beta) and 4462 (N15E73, beta) recently rotated
over the eastern limb and appear stable. All other regions are
either stable or in decay. Solar flare activity is expected to
be at R0-R1 levels over 03-05 Jun, primarily due to the observed
flare activity of regions 4455 and 4461. S0 solar radiation storm
conditions were observed on UT day 02-Jun. S0 solar radiation
storm conditions are expected over 03-05 Jun. No Earth-directed
coronal mass ejections (CMEs) have been observed. A filament
eruption was observed, visible in H-alpha imagery from 02/0938UT
centred near S10E70. A subsequent associated CME was observed
in coronagraph imagery at 02/1224UT. Modelling indicates this
CME is not geoeffective. An east-directed CME was observed, visible
in LASCO C2 coronagraph imagery from 02/1700UT. This CME is considered
a farside event and not geoeffective. The solar wind speed on
UT day 02-Jun mildly declined, ranging from 405 to 365 km/s and
is currently near 375 km/s. The peak total interplanetary magnetic
field strength (IMF, Bt) was 7 nT and the north-south IMF component
(Bz) range was -6 to +6 nT. The solar wind speed is expected
to increase on 03-Jun due to coronal hole high speed wind stream
effects from a small equatorial coronal hole, then remain elevated
over 04-05 Jun.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 02 Jun: G0
Estimated Indices 02 Jun : A K
Australian Region 3 11111021
Cocos Island 3 11101121
Darwin 4 21111022
Townsville 4 12211021
Learmonth 5 21211031
Alice Springs 2 12100021
Gingin 5 22201031
Canberra 2 11111020
Kennaook Cape Grim 3 11111121
Hobart 3 11111120
Estimated Antarctic Regional K Indices 02 Jun :
Macquarie Island 3 11122010
Casey 7 23321121
Mawson 25 54322255
Observed Regional daily pc3 Indices 02 Jun :
Darwin 0 (Quiet)
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 02 Jun : A
Fredericksburg 6
Planetary 7
Observed AFr/Ap Indices 01 Jun : A K
Fredericksburg 9
Planetary 9 2122 3331
2B. MAGNETIC FORECAST
Date Ap Conditions
03 Jun 12 G0, chance of G1
04 Jun 10 G0
05 Jun 8 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
and planetary regions on UT day 02-Jun. G1 geomagnetic conditions
were observed in the Antarctic region. G0 planetary geomagnetic
conditions are expected over 03-05 Jun, with a chance of G1 on
03-Jun due to coronal hole high speed wind stream effects from
an equatorial coronal hole.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
02 Jun Normal Normal-fair Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
03 Jun Normal Normal Normal-fair
04 Jun Normal Normal Normal-fair
05 Jun Normal Normal Normal-fair
COMMENT: Global ionospheric conditions were normal to fair on
UT day 02-Jun, with some degradations observed in the southern
hemisphere. Global ionospheric conditions are expected to be
mostly normal over 03-05 Jun, with some mild degradations possible
at high latitudes. Shortwave fadeouts are possible.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
02 Jun 82
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 during local day.
Depressed by 15% during local night.
Northern Australian Region:
Mostly near predicted monthly values.
Southern Australian Region:
Mostly near predicted monthly values.
Enhanced by 20% after local dawn.
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
03 Jun 80 Near predicted monthly values
04 Jun 85 Near to 15% above predicted monthly values
05 Jun 85 Near to 15% above predicted monthly values
COMMENT: ASWFC SWF HF Communications Warning 51 was issued on
2 June and is current for 2-4 Jun. Maximum Usable Frequencies
(MUFs) in the Australian region were mostly near predicted monthly
values to 20% enhanced on UT day 02-Jun. Significant spread-F
was observed across the Australian region during local night
hours, with the most significant spread-F observed in the southern
Australian region. MUFs are expected to be near predicted monthly
values on 03-Jun, then near predicted monthly values to 15% enhanced
over 04-05 Jun. Shortwave fadeouts are possible.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 01 Jun
Daily Proton Fluence >1 MeV: 1.2E+05
Daily Proton Fluence >10 MeV: 1.9E+04
Daily Electron Fluence >2 MeV: 1.80E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 3%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B5.9
DSCOVR Satellite Solar Wind Day Averaged Data for 01 Jun
Speed: 410 km/sec Density: 3.1 p/cc Temp: 20500 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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