[Ips-dsgr] ASWFC Daily Report - 07 June 25 issued 2330 UT on 07 Jun 2025 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sun Jun 8 09:30:55 AEST 2025
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/07 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 07 JUNE AND FORECAST FOR 08 JUNE - 10 JUNE
STATUS INDICATORS SOL:GREEN MAG:** YELLOW ** ION: ** YELLOW **
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 07 Jun: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 07 Jun: 121/73
1B. SOLAR FORECAST
08 Jun 09 Jun 10 Jun
Activity R0, chance R1 R0, chance R1 R0, chance R1
Fadeouts None expected None expected None expected
10.7cm/SSN 120/72 125/78 125/78
COMMENT: Solar activity on UT day 07-Jun was at the R0 level,
with no significant flaring activity. There are currently five
numbered sunspot regions visible on the solar disk. AR4105 (S15E26,
beta-gamma) is the most magnetically complex region on the disk
and has exhibited spot development in its intermediate spots
over the UT day. AR4108 (S21W14, beta) and AR4109 (S16E13, beta)
have shown mild spot growth over the 24-hour period. All other
sunspot regions are either stable or in decay. Solar activity
is expected to be at the R0 level over 08-10 Jun, with a chance
of R1. No Earth-directed CMEs have been observed. The solar wind
speed on UT day 07-Jun increased, ranging from 385 to 445 km/s
and is currently near 445 km/s. A weak solar wind shock was observed
at 07/0016UT, indicative of a CME arrival. The peak total interplanetary
magnetic field strength (IMF, Bt) was 16 nT and the north-south
IMF component (Bz) range was -12 to +12 nT. Two periods of sustained
southward IMF conditions were observed over the intervals 07/0633-0835UT
and 07/1801-2035UT. The solar wind speed is expected to decrease
over 08-10 Jun due to waning coronal hole high speed wind stream
effects.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 07 Jun: G0
Estimated Indices 07 Jun : A K
Australian Region 13 12332144
Cocos Island 9 12232133
Darwin 13 22332144
Townsville 13 23332143
Learmonth 19 13332155
Alice Springs 12 12232144
Gingin 18 12332255
Canberra 10 12332233
Kennaook Cape Grim 15 12342244
Hobart 11 11342233
Estimated Antarctic Regional K Indices 07 Jun :
Macquarie Island 16 02353333
Casey 14 32322244
Mawson 37 36532265
Observed Regional daily pc3 Indices 07 Jun :
Darwin 2 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 8 (Quiet)
Canberra 12 (Quiet)
Hobart 17 (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 07 Jun : A
Fredericksburg 16
Planetary 20
Observed AFr/Ap Indices 06 Jun : A K
Fredericksburg 8
Planetary 0 ---- ----
2B. MAGNETIC FORECAST
Date Ap Conditions
08 Jun 18 G0-G1
09 Jun 8 G0
10 Jun 8 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 07-Jun, with isolated periods of G1 observed
at Learmonth. Mostly G0-G1 geomagnetic conditions were observed
in the Antarctic region, with isolated periods of G2 observed
at Mawson. G0-G1 geomagnetic conditions are expected on 08-Jun
due to ongoing elevated solar wind conditions. G0 geomagnetic
conditions are expected over 09-10 Jun.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
07 Jun Normal-fair Normal-fair Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
08 Jun Normal Normal-fair Fair
09 Jun Normal Normal Normal-fair
10 Jun Normal Normal Normal
COMMENT: HF radio propagation conditions on UT day 07-Jun were
normal to fair. HF conditions are expected to be normal to fair
over 08-10 Jun.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
07 Jun 76
Observed Australian Regional MUFs
Cocos Island Region:
Near predicted monthly values during local day.
Depressed by 25% during local night.
Niue Island Region:
Depressed by 20% during local day.
Depressed by 15% during local night.
Northern Australian Region:
Near predicted monthly values during local day.
Depressed by 30% during local night.
Southern Australian Region:
Mostly near predicted monthly values.
Antarctic Region (Casey/Davis/Mawson):
Depressed by 15% over the UT day.
Monthly T index:
Month T index
May 94
Jun 109
Jul 107
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
08 Jun 75 15 to 20% below predicted monthly values
09 Jun 90 Near predicted monthly values
10 Jun 90 Near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region on UT day 07-Jun were near predicted monthly values to
30% depressed in northern Australia. Spread F was observed at
Hobart and Townsville during local night hours. MUFs are expected
to be 15-20% depressed on 08-Jun, returning to near predicted
monthly values over 09-10 Jun.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 06 Jun
Daily Proton Fluence >1 MeV: 4.6E+06
Daily Proton Fluence >10 MeV: 1.9E+04
Daily Electron Fluence >2 MeV: 2.30E+08 (moderate fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability:16%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B8.3
DSCOVR Satellite Solar Wind Day Averaged Data for 06 Jun
Speed: 461 km/sec Density: 1.9 p/cc Temp: 87000 K Bz: -1 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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