[Ips-dsgr] ASWFC Daily Report - 29 July 25 issued 2332 UT on 29 Jul 2025 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Wed Jul 30 09:32:34 AEST 2025
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/29 JULY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 29 JULY AND FORECAST FOR 30 JULY - 01 AUGUST
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 29 Jul: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 29 Jul: 152/107
1B. SOLAR FORECAST
30 Jul 31 Jul 01 Aug
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 145/99 140/94 140/94
COMMENT: Solar activity on UT day 29-Jul was at the R0 level,
with no significant flaring activity. There are currently eight
numbered sunspot regions visible on the solar disk and one unnumbered
solar region near N12E85 currently rotating onto the solar disk. AR4155
(S12W05, beta) has shown growth over the UT day and is the second
largest sunspot region on the solar disk. All other sunspot regions
are either stable or in decay. Solar activity is expected to
be at the R0 level over 30-Jul to 01-Aug. S0 solar proton conditions
were observed on UT day 29-Jul. S0 solar proton conditions are
expected over 30-Jul to 01-Aug. No Earth-directed CMEs have been
observed. The solar wind speed over UT day 29-Jul mildly decreased,
ranging from 410 to 330 km/s and is currently near 370 km/s.
The peak total interplanetary magnetic field strength (IMF, Bt)
was 8 nT and the north-south IMF component (Bz) range was -5
to +7 nT. The solar wind speed is expected to remain near background
levels over 30-Jul to 01-Aug. There is a chance of a slight increase
in the solar wind from 30-Jul due to coronal hole high speed
wind stream effects from a northern hemisphere coronal hole.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 29 Jul: G0
Estimated Indices 29 Jul : A K
Australian Region 4 12320000
Cocos Island 4 22310010
Darwin 6 23310111
Townsville 6 13320111
Learmonth 5 23310110
Alice Springs 3 13210000
Gingin 2 12210000
Canberra 3 12220001
Kennaook Cape Grim 5 12331000
Hobart 4 12231000
Estimated Antarctic Regional K Indices 29 Jul :
Macquarie Island 11 12451000
Casey 6 33220111
Mawson 16 44521113
Observed Regional daily pc3 Indices 29 Jul :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 0 (Quiet)
Canberra 6 (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 29 Jul : A
Fredericksburg 6
Planetary 9
Observed AFr/Ap Indices 28 Jul : A K
Fredericksburg 7
Planetary 7 1112 2223
2B. MAGNETIC FORECAST
Date Ap Conditions
30 Jul 8 G0
31 Jul 8 G0
01 Aug 6 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 29-Jul. Mostly G0 geomagnetic conditions were
observed in the Antarctic region, with an isolated period of
G1 observed at Macquarie Island and Mawson. G0 geomagnetic conditions
are expected over 30-Jul to 01-Aug.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
29 Jul Normal Normal Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
30 Jul Normal Normal Normal-fair
31 Jul Normal Normal Normal-fair
01 Aug Normal Normal Normal-fair
COMMENT: HF radio propagation conditions on UT day 29-Jul were
mostly normal, with periods of fair conditions at high latitudes.
HF radio propagation conditions are expected to be mostly normal
over 30-Jul to 01-Aug.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
29 Jul 105
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 20% during local day.
Depressed by 20% during local night.
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
30 Jul 95 Near predicted monthly values
31 Jul 95 Near predicted monthly values
01 Aug 95 Near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) on UT day 29-Jul were
near predicted monthly values in the Australian region. Spread
F was observed at Hobart and Perth during local night hours.
MUFs are expected to be near predicted monthly values over 30-Jul
to 01-Aug.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 28 Jul
Daily Proton Fluence >1 MeV: 8.3E+05
Daily Proton Fluence >10 MeV: 1.6E+04
Daily Electron Fluence >2 MeV: 7.40E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 9%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B8.3
DSCOVR Satellite Solar Wind Day Averaged Data for 28 Jul
Speed: 396 km/sec Density: 3.1 p/cc Temp: 50400 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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