[Ips-dsgr] ASWFC Daily Report - 26 July 25 issued 2332 UT on 26 Jul 2025 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sun Jul 27 09:32:25 AEST 2025
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/26 JULY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 26 JULY AND FORECAST FOR 27 JULY - 29 JULY
STATUS INDICATORS SOL:** YELLOW ** MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 26 Jul: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 26 Jul: 143/97
1B. SOLAR FORECAST
27 Jul 28 Jul 29 Jul
Activity R0-R1 R0-R1 R0-R1
Fadeouts Possible Possible Possible
10.7cm/SSN 145/99 145/99 140/94
COMMENT: Solar activity on Ut day 26-Jul was R0, with no solar
flares. There are currently ten numbered sunspot regions on the
solar disk. Many regions have shown subtle changes and maturation,
although no regions have increased in magnetic complexity and
they all remain stable. Solar activity is expected to be R0-R1
over 27-29 Jul.
No Earth directed CMEs were observed on UT day 26-Jul.
S0 solar radiation storm conditions were observed on UT day 26-Jul.
S0 solar radiation storm conditions are expected over 27-29 Jul.
The solar wind environment on UT day 26-Jul was mildly disturbed due
to the arrival of a CME that was first launched from the Sun on 23-Jul.
The solar wind speed peaked near 550 km/s and is currently on a
declining trend near 475 km/s. The peak total interplanetary field
strength (IMF, Bt) was 11 nT and the north-south IMF component range
(Bz) was +8 to -10 nT although there were no significant periods of
southward Bz. The solar wind environment is expected to ease to background
levels over 27-29 Jul.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 26 Jul: G0
Estimated Indices 26 Jul : A K
Australian Region 7 11123321
Cocos Island 7 12023321
Darwin 7 21123321
Townsville 7 21123321
Learmonth 7 21123321
Alice Springs 6 11123311
Gingin 7 12023321
Canberra 6 01023321
Kennaook Cape Grim 6 11023321
Hobart 7 11123321
Estimated Antarctic Regional K Indices 26 Jul :
Macquarie Island 9 01025311
Casey 14 33333332
Mawson 27 53324363
Observed Regional daily pc3 Indices 26 Jul :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 5 (Quiet)
Canberra 3 (Quiet)
Hobart 2 (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 26 Jul : A
Fredericksburg 10
Planetary 11
Observed AFr/Ap Indices 25 Jul : A K
Fredericksburg 10
Planetary 8 2222 2223
2B. MAGNETIC FORECAST
Date Ap Conditions
27 Jul 10 G0, chance G1
28 Jul 7 G0
29 Jul 7 G0
COMMENT: ASWFC Geomagnetic Warning 57 was issued on 26 July and
is current for 26-27 Jul. G0 geomagnetic conditions were observed
in the Australian region on UT day 26-Jul. G0-G1 geomagnetic
conditions were observed in the Antarctic region. Mostly G0 geomagnetic
conditions are expected over 27-29 Jul, with a chance for G1
on 27-Jul.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
26 Jul Normal Normal Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
27 Jul Normal Normal Normal
28 Jul Normal Normal Normal
29 Jul Normal Normal Normal
COMMENT: HF radio propagation conditions on UT day 26-Jul were
generally normal. HF radio propagation conditions are expected
to be mostly normal over 27-29 Jul.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
26 Jul 99
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 40% during local day.
Enhanced by 20% during local night.
Depressed by 20% after local dawn.
Niue Island Region:
Near predicted monthly values during local day.
Depressed by 15% during local night.
Northern Australian Region:
Mostly near predicted monthly values.
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
Jun 79
Jul 104
Aug 102
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
27 Jul 100 Near predicted monthly values
28 Jul 105 Near predicted monthly values
29 Jul 105 Near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) on UT day 26-Jul were
mostly near predicted values. Sporadic-E was observed during
local dawn hours in Learmonth, Brisbane and Canberra during local
dawn hours. MUFs are generally expected to be near predicted
values over 27-29 Jul.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 25 Jul
Daily Proton Fluence >1 MeV: 7.6E+05
Daily Proton Fluence >10 MeV: 1.7E+04
Daily Electron Fluence >2 MeV: 1.4E+08
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B8.3
DSCOVR Satellite Solar Wind Day Averaged Data for 25 Jul
Speed: 556 km/sec Density: 1.6 p/cc Temp: 151000 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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