[Ips-dsgr] ASWFC Daily Report - 30 July 25 issued 2332 UT on 30 Jul 2025 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Thu Jul 31 09:32:30 AEST 2025
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/30 JULY 2025
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 30 JULY AND FORECAST FOR 31 JULY - 02 AUGUST
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 30 Jul: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 30 Jul: 149/104
1B. SOLAR FORECAST
31 Jul 01 Aug 02 Aug
Activity R0 R0 R0
Fadeouts None expected None expected None expected
10.7cm/SSN 148/102 146/100 146/100
COMMENT: Solar activity on UT day 30-Jul was at the R0 level,
with no significant flaring activity. There are currently ten
numbered sunspot regions visible on the solar disk. AR4166 (N19W23,
beta) is currently the most notable sunspot region due to its
recent development on the solar disk over the UT day. Solar regions
AR4161 (S16E37, beta) and AR4164 (S21E27, alpha) also have shown
slight growth over the UT day. All other sunspot regions are
either stable or in decay. Solar activity is expected to be at
the R0 level over 31-Jul to 02-Aug. S0 solar proton conditions
were observed on UT day 30-Jul. S0 solar proton conditions are
expected over 31-Jul to 02-Aug. No Earth-directed CMEs have been
observed. The solar wind speed over 30-Jul mildly increased mid
UT day before resuming a declining trend, ranging from 360 to
510 km/s and is currently near 490 km/s. The peak total interplanetary
magnetic field strength (IMF, Bt) was 13 nT and the north-south
IMF component (Bz) range was -10 to +10 nT. A sustained period
of significant -Bz (mostly -5 nT or lower) began at 30/2235UT
and is currently ongoing. The solar wind speed is expected to
decline to near background levels over 31-Jul to 02-Aug.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 30 Jul: G0
Estimated Indices 30 Jul : A K
Australian Region 4 11022221
Cocos Island 3 11022210
Darwin 6 21122222
Townsville 5 11122221
Learmonth 5 21122221
Alice Springs 5 21022221
Gingin 5 11012330
Canberra 4 11021221
Kennaook Cape Grim 4 11111221
Hobart 3 11011220
Estimated Antarctic Regional K Indices 30 Jul :
Macquarie Island 2 01012210
Casey 9 33212321
Mawson 16 33232344
Observed Regional daily pc3 Indices 30 Jul :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 2 (Quiet)
Gingin 0 (Quiet)
Canberra 0 (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 Jul : A
Fredericksburg 8
Planetary 12
Observed AFr/Ap Indices 29 Jul : A K
Fredericksburg 8
Planetary 7 3222 1112
2B. MAGNETIC FORECAST
Date Ap Conditions
31 Jul 10 G0
01 Aug 6 G0
02 Aug 5 G0
COMMENT: G0 geomagnetic conditions were observed in both the
Australian and Antarctic regions on UT day 30-Jul. G0 geomagnetic
conditions are expected over 31-Jul to 02-Aug.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
30 Jul Normal Normal Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
31 Jul Normal Normal Normal-fair
01 Aug Normal Normal Normal
02 Aug Normal Normal Normal
COMMENT: HF radio propagation conditions on UT day 30-Jul were
mostly normal, with periods of fair conditions at high latitudes.
HF radio propagation conditions are expected to be mostly normal
over 31-Jul to 02-Aug.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
30 Jul 105
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 15% during local day.
Near predicted monthly values during local night.
Niue Island Region:
Near predicted monthly values.
Northern Australian Region:
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
31 Jul 100 Near predicted monthly values
01 Aug 100 Near predicted monthly values
02 Aug 100 Near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) on UT day 30-Jul were
near predicted monthly values in the Australian region. MUFs
are expected to be near predicted monthly values over 31-Jul
to 02-Aug.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 29 Jul
Daily Proton Fluence >1 MeV: 4.7E+05
Daily Proton Fluence >10 MeV: 1.6E+04
Daily Electron Fluence >2 MeV: 2.70E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 4%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B9.9
DSCOVR Satellite Solar Wind Day Averaged Data for 29 Jul
Speed: 374 km/sec Density: 3.5 p/cc Temp: 47100 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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