[Ips-dsgr] ASWFC Daily Report - 01 June 26 issued 2330 UT on 01 Jun 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Tue Jun 2 09:30:48 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/01 JUNE 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 01 JUNE AND FORECAST FOR 02 JUNE - 04 JUNE
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 01 Jun: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 01 Jun: 132/86
1B. SOLAR FORECAST
02 Jun 03 Jun 04 Jun
Activity R0, chance of R1 R0, chance of R1 R0, chance of R1
Fadeouts None expected None expected None expected
10.7cm/SSN 128/81 130/84 127/80
COMMENT: Solar flare activity on UT day 01-Jun was at the R0
level, with no significant flaring activity. There are currently
nine numbered active regions (ARs) visible on the solar disk.
AR 4455 (N15E12, beta) is the largest region on the disk and
has shown minor spot development in its trailer spots over the
UT day. AR 4446 (S13N48, beta) has exhibited development in its
trailer spots. Newly numbered region 4458 (S09E20, beta) recently
appeared on the solar disk and has shown rapid spot development.
A second newly numbered region 4459 (N11E60, beta) recently appeared
and has shown mild growth. All other regions are either stable
or in decay. Solar flare activity is expected to be at the R0
level over 02-04 Jun, with a chance of R1. S0 solar radiation
storm conditions were observed on UT day 01-Jun. S0 solar radiation
storm conditions are expected over 02-04 Jun. No Earth-directed
coronal mass ejections (CMEs) have been observed. The solar wind
speed on UT day 01-Jun decreased, ranging from 460 to 385 km/s
and is currently near 395 km/s. The peak total interplanetary
magnetic field strength (IMF, Bt) was 7 nT and the north-south
IMF component (Bz) range was -7 to 0 nT. Southward IMF conditions
were observed for most of the UT day, with the strongest observed
over the interval 01/1212-1546UT. The solar wind speed is expected
to remain near background levels on 02-Jun, then increase late
on 03-Jun due to coronal hole high speed wind stream effects
from a small equatorial coronal hole.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 01 Jun: G0
Estimated Indices 01 Jun : A K
Australian Region 5 11122221
Cocos Island 3 11011220
Darwin 4 11121221
Townsville 6 12122321
Learmonth 7 11132231
Alice Springs 5 11122221
Gingin 7 10132331
Canberra 5 11123220
Kennaook Cape Grim 9 11133331
Hobart 8 10133331
Estimated Antarctic Regional K Indices 01 Jun :
Macquarie Island 15 10154431
Casey 5 21122221
Mawson 17 43322344
Observed Regional daily pc3 Indices 01 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 01 Jun : A
Fredericksburg 10
Planetary 12
Observed AFr/Ap Indices 31 May : A K
Fredericksburg 8
Planetary 11 4322 3222
2B. MAGNETIC FORECAST
Date Ap Conditions
02 Jun 8 G0
03 Jun 12 G0, chance of G1
04 Jun 10 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
and planetary regions on UT day 01-Jun. Mostly G0 geomagnetic
conditions were observed in the Antarctic region, with an isolated
period of G1 observed at Macquarie Island. G0 planetary geomagnetic
conditions are expected over 02-04 Jun, with a chance of G1 on
03-Jun due to coronal hole high speed wind stream effects from
a small equatorial coronal hole.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
01 Jun Normal-fair Normal Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
02 Jun Normal Normal Normal-fair
03 Jun Normal Normal Normal-fair
04 Jun Normal Normal Normal-fair
COMMENT: Global ionospheric conditions were normal to fair on
UT day 01-Jun, with some degradations observed at low latitudes.
Global ionospheric conditions are expected to be mostly normal
over 02-04 Jun, with some mild degradations possible at high
latitudes.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
01 Jun 87
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:
Enhanced by 20% during local day.
Depressed by 15% during local night.
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
02 Jun 85 Near predicted monthly values
03 Jun 85 Near predicted monthly values
04 Jun 85 Near predicted monthly values
COMMENT: Maximum Usable Frequencies (MUFs) in the southern Australian
region were near predicted monthly values on UT day 01-Jun. Northern
Australia MUFs were enhanced by 20% during local day, and 15%
depressed during local night. 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 remain near predicted monthly values
over 02-04 Jun.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 31 May
Daily Proton Fluence >1 MeV: 1.1E+05
Daily Proton Fluence >10 MeV: 1.9E+04
Daily Electron Fluence >2 MeV: 1.90E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 3%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B6.8
DSCOVR Satellite Solar Wind Day Averaged Data for 31 May
Speed: 490 km/sec Density: 2.3 p/cc Temp: 104000 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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