[Ips-dsgr] ASWFC Daily Report - 25 June 26 issued 2330 UT on 25 Jun 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Fri Jun 26 09:30:50 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/25 JUNE 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 25 JUNE AND FORECAST FOR 26 JUNE - 28 JUNE
STATUS INDICATORS SOL:** YELLOW ** MAG:** YELLOW ** ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
-----------------------------------------------------------
1A. SOLAR SUMMARY
Activity 25 Jun: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 25 Jun: 156/110
1B. SOLAR FORECAST
26 Jun 27 Jun 28 Jun
Activity R0-R1, chance R2 R0-R1, chance R2 R0-R1, chance R2
Fadeouts Possible Possible Possible
10.7cm/SSN 155/109 155/109 155/109
COMMENT: Solar flare activity on UT day 25-Jun was R0, with no
significant flaring. There are currently eight numbered sunspot
regions on the solar disk. Active region (AR) 4478 (S06E61, beta-gamma-delta)
is the most complex region on the disk, and while it shows high
potential for activity, this region has so far been quiet and
showed little change in the past day. AR 4475 (S09W01, beta)
has shown some instability in its leader spot but is otherwise
quiet. All other regions are either stable or in decay. Solar
activity is mostly expected to be R0-R1 over 26-28 Jun, with
potential for R2 activity from 4478.
No Earth-directed CMEs were observed on UT day 25-Jun.
S0 solar radiation storm conditions were observed on UT day 25-Jun.
S0 solar radiation storm conditions are expected over 26-28 Jun.
The solar wind environment on UT day 25-Jun showed signs of the early
arrival of the north-south coronal hole. The solar wind speed
steadily increased from 600 to 700 km/s. The peak total interplanetary
field strength (IMF, Bt) was 10 nT on a slow decline, and the north-south
IMF component range (Bz) was +8 to -10 nT. The solar wind speed is expected
to remain enhanced over 26-27 Jun, returning to near background
levels by 28-Jun.
-----------------------------------------------------------
2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 25 Jun: G0
Estimated Indices 25 Jun : A K
Australian Region 15 44324222
Cocos Island 10 33313221
Darwin 11 34313221
Townsville 14 44323222
Learmonth 21 53325332
Alice Springs 12 34313222
Gingin 18 53314332
Canberra 11 34223222
Kennaook Cape Grim 16 44224332
Hobart 15 34324322
Estimated Antarctic Regional K Indices 25 Jun :
Macquarie Island 29 35436432
Casey 25 44323363
Mawson 61 66554566
Observed Regional daily pc3 Indices 25 Jun :
Darwin NA
Townsville 13 (Quiet)
Learmonth 11 (Quiet)
Alice Springs 11 (Quiet)
Gingin 86 (Minor storm)
Canberra 59 (Unsettled)
Hobart 103 (Major storm)
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 25 Jun : A
Fredericksburg 18
Planetary 26
Observed AFr/Ap Indices 24 Jun : A K
Fredericksburg 11
Planetary 15 2233 3444
2B. MAGNETIC FORECAST
Date Ap Conditions
26 Jun 18 G0-G1
27 Jun 18 G0-G1
28 Jun 12 G0
COMMENT: ASWFC Geomagnetic Warning 38 was issued on 25 June and
is current for 25-27 Jun. G0 geomagnetic conditions were observed,
on average, in the Australian region on UT day 25-Jun although
isolated G1 periods were observed in Learmonth and Gingin. G0-G2
geomagnetic conditions were observed in the Antarctic region,
and the planetary region observed G1. G0-G1 geomagnetic conditions
are expected over 26-27 Jun due to ongoing coronal hole effects,
returning to G0 by 28-Jun.
-----------------------------------------------------------
3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
25 Jun Normal Normal Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
26 Jun Normal Normal-fair Normal-fair
27 Jun Normal-fair Normal-fair Fair
28 Jun Normal-fair Normal-fair Normal-fair
COMMENT: HF radio propagation conditions on UT day 25-Jun were
mostly normal. HF radio propagation conditions are likely to
be normal to mildly degraded over 26-28 Jun, particularly during
local night hours, as Earth is currently under the influence
of a coronal hole wind stream.
-----------------------------------------------------------
4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
25 Jun 93
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.
Near predicted monthly values during local night.
Southern Australian Region:
Enhanced by 15% during local day.
Near predicted monthly values during local night.
Antarctic Region (Casey/Davis/Mawson):
Depressed by 20% 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
26 Jun 75 Near predicted monthly values
27 Jun 70 Near predicted monthly values
28 Jun 60 Near predicted monthly values to 15% depressed
COMMENT: ASWFC SWF HF Communications Warning 56 was issued on
25 June and is current for 25-26 Jun. Maximum usable frequencies
(MUFs) in the Australian region on UT day 25-Jun were near predicted
values to 20% enhanced. Spread-F was observed along the east
coast of Australia during local night hours, particularly in
Hobart. MUFs are expected to be mostly near predicted monthly
values over 26-28 Jun. Some mild depressions may be observed
during local night hours by 28-Jun.
-----------------------------------------------------------
5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 24 Jun
Daily Proton Fluence >1 MeV: 6.4E+05
Daily Proton Fluence >10 MeV: 1.7E+04
Daily Electron Fluence >2 MeV: 1.20E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 2%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B9.5
DSCOVR Satellite Solar Wind Day Averaged Data for 24 Jun
Speed: 464 km/sec Density: 12.5 p/cc Temp: 200000 K Bz: 0 nT
(Courtesy Space Weather Prediction Center, Boulder USA)
-----------------------------------------------------------
Australian Space Weather Forecasting Centre
Bureau of Meteorology
ASWFC at bom.gov.au
www.bom.gov.au | www.sws.bom.gov.au
More information about the ips-dsgr
mailing list