[Ips-dsgr] ASWFC Daily Report - 08 June 26 issued 2330 UT on 08 Jun 2026 [SEC=OFFICIAL]

Tue Jun 9 09:30:46 AEST 2026

SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/08 JUNE 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 08 JUNE AND FORECAST FOR 09 JUNE - 11 JUNE
STATUS INDICATORS SOL:** YELLOW **   MAG:** YELLOW **     ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 08 Jun:  R0

Flares: none.

Observed 10.7 cm flux/Equivalent Sunspot Number for 08 Jun: 131/85

1B. SOLAR FORECAST
             09 Jun             10 Jun             11 Jun
Activity     R0-R1              R0-R1              R0-R1
Fadeouts     Possible           Possible           Possible
10.7cm/SSN   132/86             130/84             130/84

COMMENT: Solar flare activity on UT day 08-Jun was at the R0 
level, with the largest flare a C7.2 flare at 08/0248UT. There 
are eight numbered active regions (ARs) visible on the solar 
disk. ARs 4464 (S13E26, beta) and, the newly numbered, 4465 (N11E72, 
beta) showed spot development over the UT day. 4465 was also 
responsible for the largest flare of the UT day. No currently 
visible ARs are significantly magnetically complex. All other 
ARs are either stable or in decay. Solar activity over 09-11 
Jun is expected to be at R0-R1 levels. S0 solar radiation storm 
conditions were observed on UT day 08-Jun. S0 solar radiation 
storm conditions are expected over 09-11 Jun. No geoeffective 
CMEs were observed on 08-Jun. The solar wind speed decreased 
over the UT day 08-Jun. The wind speed mostly ranged between 
560 and 430 km/s . The wind speed is currently at around 450 
km/s. The peak total interplanetary field strength (IMF, Bt) 
was 5 nT and the north-south IMF component range (Bz) was +4 
to -4 nT. An anticipated CME arrival has, so far, failed to eventuate. 
The solar wind speed on 09-Jun may increase due to a late arrival 
of this CME. Otherwise the solar wind speed is expected to continue 
to decline towards background levels over 09-10 Jun. An increase 
in solar wind speed is expected on 11-Jun due to an equatorial 
coronal hole currently rotating towards a geoeffective position.

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2A. MAGNETIC SUMMARY

Geomagnetic field for Australian Region 08 Jun: Quiet to Unsettled

Estimated Indices 08 Jun : A   K           
   Australian Region       7   22232211
      Cocos Island         3   11022110
      Darwin               6   22132111
      Townsville           7   22232211
      Learmonth            8   22233121
      Alice Springs        7   22233111
      Gingin               8   22233221
      Canberra             6   22232210
      Kennaook Cape Grim   9   22342210
      Hobart               9   22333211    

Estimated Antarctic Regional K Indices 08 Jun :
      Macquarie Island    16   11364100
      Casey                8   33222112
      Mawson              25   24433246

Observed Regional daily pc3 Indices 08 Jun : 
      Darwin               0   (Quiet)
      Townsville           0   (Quiet)
      Learmonth            0   (Quiet)
      Alice Springs        0   (Quiet)
      Gingin               0   (Quiet)
      Canberra            19   (Quiet)
      Hobart              11   (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 08 Jun : A 
           Fredericksburg        16
           Planetary             23                         

Observed AFr/Ap Indices 07 Jun :  A   K
           Fredericksburg         8
           Planetary              8   3223 2211     

2B. MAGNETIC FORECAST 
Date      Ap    Conditions
09 Jun    17    G0-G1
10 Jun    11    G0
11 Jun    20    G1, chance of G2

COMMENT: ASWFC Geomagnetic Warning 36 was issued on 6 June and 
is current for 8-9 Jun. G0 geomagnetic conditions were observed 
in the Australian region on UT day 08-Jun. Mostly G2 geomagnetic 
conditions were observed in the Antarctic region. An anticipated 
CME impact has, so far, failed to eventuate. G0-G1 geomagnetic 
conditions are expected on 09-Jun due to the chance of the late 
arrival of this CME. G0 conditions are expected on 10-Jun. G1 
conditions, with a chance of G2 are expected on 11-Jun due to 
anticipated coronal hole high speed wind stream effects.

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3A. GLOBAL HF PROPAGATION SUMMARY
	            Latitude Band
Date        Low            Middle         High 
08 Jun      Normal         Normal-fair    Fair           

PCA Event : No event.

3B. GLOBAL HF PROPAGATION FORECAST
	            Latitude Band
Date        Low            Middle         High 
09 Jun      Normal         Normal-fair    Fair
10 Jun      Normal         Normal         Normal-fair
11 Jun      Normal         Normal-fair    Fair

COMMENT: HF radio propagation conditions on UT day 8-Jun were 
mostly normal, with some mild degradations in the northern hemisphere. 
HF radio propagation conditions are expected to be mostly normal 
over 09-10 Jun, with mild degradations possible if geomagnetic 
activity eventuates. Mostly normal conditions are expected on 
11-Jun.

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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY

Date   T index
08 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 20% during local day.
      Enhanced by 30% during local night.
   Northern Australian Region:
      Enhanced by 15% 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):
      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
09 Jun    75    Near predicted monthly values
10 Jun    75    Near predicted monthly values
11 Jun    65    Near predicted monthly values

COMMENT: ASWFC Preliminary HF Communications Warning 53 was issued 
on 6 June and is current for 8-10 Jun. Maximum usable frequencies 
(MUFs) in the Australian region were near predicted values to 
15% enhanced during local day hours. Spread F was observed at 
Hobart during local night hours and sporadic E with degraded 
signal with observed at Darwin during local night hours. MUFs 
are expected to be mostly near predicted monthly values over 
09-11 Jun, with a chance of depressions on 09-10 Jun should geomagnetic 
activity eventuate on 09-Jun.

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5. SPACE ENVIRONMENT SUMMARY

GOES satellite data for 07 Jun
       Daily Proton Fluence >1 MeV:   1.2E+06
       Daily Proton Fluence >10 MeV:  3.5E+04
       Daily Electron Fluence >2 MeV: 1.00E+08   (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability:10%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
       X-ray background: B8.0

DSCOVR Satellite Solar Wind Day Averaged Data for 07 Jun
Speed: 548 km/sec  Density:    1.1 p/cc  Temp:   107000 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