[Ips-dsgr] ASWFC Daily Report - 30 June 25 issued 2330 UT on 30 Jun 2025 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Tue Jul 1 09:30:58 AEST 2025
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/30 JUNE 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 30 JUNE AND FORECAST FOR 01 JULY - 03 JULY
STATUS INDICATORS SOL:** YELLOW ** MAG:** YELLOW ** ION: ** YELLOW **
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 30 Jun: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 30 Jun: 128/81
1B. SOLAR FORECAST
01 Jul 02 Jul 03 Jul
Activity R0-R1 R0-R1 R0-R1
Fadeouts Possible Possible Possible
10.7cm/SSN 126/79 125/78 125/78
COMMENT: Solar activity on UT day 30-Jun was R0, with no significant
solar flares. There are currently seven numbered sunspot regions
on the solar disk. AR4127 (S17E21, beta) has shown some minor
growth but has been quiet in the past day. New region AR4129
(S03E35), while still premature, may develop some complexity.
Solar activity is expected to be R0 with a chance of R1 over
1-3 Jul.
No Earth directed CMEs were observed in available imagery.
A weak partial halo CME from 28-Jun has been assessed as Earth
directed and may arrive late 1-Jul or early on 2-Jul.
S0 solar radiation storm conditions were observed on UT day 30-Jun.
S0 solar radiation storm conditions are expected over 1-3 Jul.
The solar wind environment was mostly steady on UT day 30-Jun.
The solar wind speed mostly ranged from 400-500 km/s, elevated due
to coronal hole activity but on a general declining trend. The peak
total interplanetary field strength (IMF, Bt) was 7 nT and the
north-south IMF component range (Bz) was +6 to -6 nT. The solar
wind is expected to be mildly elevated due to waning coronal hole
effects, then become disturbed on either late 1-Jul or early 2-Jul
due to the arrival of a weak CME from 28-Jun.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 30 Jun: G0
Estimated Indices 30 Jun : A K
Australian Region 8 22231321
Cocos Island 6 22221221
Darwin 8 22231321
Townsville 8 22231321
Learmonth 10 23331321
Alice Springs 7 12231321
Gingin 9 22231331
Canberra 6 11230321
Kennaook Cape Grim 8 11241321
Hobart 8 11241321
Estimated Antarctic Regional K Indices 30 Jun :
Macquarie Island 14 22350421
Casey 9 23232222
Mawson 37 45443546
Observed Regional daily pc3 Indices 30 Jun :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 0 (Quiet)
Canberra 8 (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 30 Jun : A
Fredericksburg 8
Planetary 10
Observed AFr/Ap Indices 29 Jun : A K
Fredericksburg 11
Planetary 0 2222 2223
2B. MAGNETIC FORECAST
Date Ap Conditions
01 Jul 6 G0, chance G1
02 Jul 20 G0-G1
03 Jul 15 G0, chance G1
COMMENT: ASWFC Geomagnetic Warning 49 was issued on 30 June and
is current for 2 Jul only. G0 geomagnetic conditions were observed
in the Australian region on UT day 20-Jun. G0-G2 geomagnetic
conditions were observed in the Antarctic region. G0 geomagnetic
conditions are expected on 1-Jul. G1 geomagnetic conditions may
begin either late 1-Jul or else early on 2-Jul due to an anticipated
CME impact which may continue into 3-Jul.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
30 Jun Normal Normal Fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
01 Jul Normal Normal Normal-fair
02 Jul Normal-fair Normal-fair Fair
03 Jul Normal-fair Normal-fair Fair
COMMENT: HF radio propagation conditions on UT day 30-Jun were
mildly degraded in the southern hemisphere. HF radio propagation
conditions are expected to be normal on 1-Jul, but becoming mildly
degraded over 2-3 Jul due to anticipated geomagnetic activity.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
30 Jun 83
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 40% during local day.
Depressed by 25% during local night.
Niue Island Region:
Depressed by 25% during local day.
Enhanced by 25% during local night.
Northern Australian Region:
Near predicted monthly values during local day.
Depressed by 15% during local night.
Southern Australian Region:
Near predicted monthly values during local day.
Depressed by 15% during local night.
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
01 Jul 85 Near predicted values
02 Jul 80 Near predicted values to 15% depressed
03 Jul 75 Near predicted monthly values to 15% depressed
COMMENT: Maximum usable frequencies (MUFs) on UT day 30-Jun in
the Australian region were near predicted values to 15% depressed.
Signal spreading was observed in Niue and Hobart during local
night hours. Sporadic-E was observed in Hobart and Learmonth.
MUFs are expected to be near predicted values on UT day 1-Jul,
then becoming 15% depressed over 2-3 Jul due to geomagnetic activity.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 29 Jun
Daily Proton Fluence >1 MeV: 5.4E+05
Daily Proton Fluence >10 MeV: 1.9E+04
Daily Electron Fluence >2 MeV: 2.10E+08 (moderate fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability:16%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B6.3
DSCOVR Satellite Solar Wind Day Averaged Data for 29 Jun
Speed: 519 km/sec Density: 1.0 p/cc Temp: 120000 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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