[Ips-dsgr] ASWFC Daily Report - 28 July 26 issued 2330 UT on 28 Jul 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Wed Jul 29 09:30:55 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/28 JULY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 28 JULY AND FORECAST FOR 29 JULY - 31 JULY
STATUS INDICATORS SOL:GREEN MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 28 Jul: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 28 Jul: 143/97
1B. SOLAR FORECAST
29 Jul 30 Jul 31 Jul
Activity R0, chance of R1 R0, chance of R1 R0, chance of R1
Fadeouts None expected None expected None expected
10.7cm/SSN 145/99 145/99 140/94
COMMENT: Solar flare activity on UT day 28-Jul was at the R0
level, with only C-class flares observed. There are currently
six numbered regions visible on the solar disk. Active Region
(AR) 4498 (N15E66, beta) is the largest region on the disk and
has exhibited mild growth in its trailer spots over the UT day.
Newly numbered region 4499 (N04E34, beta) has shown spot development
over the 24-hour period. All other regions are either stable
or in decay. Solar flare activity is expected to be at the R0
level over 29-31 Jul, with a chance of R1. S0 solar radiation
storm conditions were observed on UT day 28-Jul. S0 solar radiation
storm conditions are expected over 29-31 Jul. No Earth-directed
coronal mass ejections (CMEs) have been observed. The solar wind
speed on UT day 28-Jul was mostly stable, ranging from 360 to
405 km/s and is currently near 370 km/s. The peak total interplanetary
magnetic field strength (IMF, Bt) was 9 nT and the north-south
IMF component (Bz) range was -4 to +6 nT. A southern hemisphere
coronal hole is currently crossing the central meridian, but
is considered too far south to influence the Earth. The solar
wind speed is expected to remain near background levels over
29-31 Jul.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 28 Jul: G0
Estimated Indices 28 Jul : A K
Australian Region 5 11221221
Cocos Island 4 11221121
Darwin 6 22222121
Townsville 6 21222122
Learmonth 6 21221222
Alice Springs 5 12222121
Gingin 7 11211332
Canberra 3 11111121
Kennaook Cape Grim 4 11111221
Hobart 4 11111221
Estimated Antarctic Regional K Indices 28 Jul :
Macquarie Island 1 00101111
Casey 8 33211231
Mawson 17 42422153
Observed Regional daily pc3 Indices 28 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 28 Jul : A
Fredericksburg 8
Planetary 9
Observed AFr/Ap Indices 27 Jul : A K
Fredericksburg 7
Planetary 7 2121 2223
2B. MAGNETIC FORECAST
Date Ap Conditions
29 Jul 6 G0
30 Jul 8 G0
31 Jul 10 G0
COMMENT: G0 geomagnetic conditions were observed in the Australian
and planetary regions on UT day 28-Jul. Mostly G0 geomagnetic
conditions were observed in the Antarctic region, with an isolated
period of G1 observed at Mawson. G0 planetary geomagnetic conditions
are expected over 29-31 Jul.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
28 Jul Normal Normal-fair Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
29 Jul Normal Normal Normal
30 Jul Normal Normal Normal-fair
31 Jul Normal Normal Normal-fair
COMMENT: Global high-frequency (HF) radio propagation conditions
were mostly normal on UT day 28-Jul. Global HF propagation conditions
are forecast to be mostly normal over 29-31 Jul.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
28 Jul 88
Observed Australian Regional MUFs
Cocos Island Region:
No data available during local day.
No data available during local night.
Niue Island Region:
Mostly near predicted monthly values.
Enhanced by 20% after local dawn.
Northern Australian Region:
Near predicted monthly values.
Southern Australian Region:
Enhanced by 15% during local day and night.
Enhanced by 20% after local dawn.
Antarctic Region (Casey/Davis/Mawson):
Near predicted monthly values over the UT day.
Monthly T index:
Month T index
Jun 81
Jul 66
Aug 63
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
29 Jul 85 Near to 15% above predicted monthly values
30 Jul 85 Near to 15% above predicted monthly values
31 Jul 85 Near to 15% above predicted monthly values
COMMENT: Maximum Usable Frequencies (MUFs) in the Australian
region were mostly near predicted monthly values on UT day 28-Jul,
with 15-20% enhancements observed in the southern Australian
region. Spread-F was observed at several Australian sites during
local night hours. MUFs are expected to be near predicted monthly
values to 15% enhanced over 29-31 Jul.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 27 Jul
Daily Proton Fluence >1 MeV: 3.8E+05
Daily Proton Fluence >10 MeV: 1.9E+04
Daily Electron Fluence >2 MeV: 6.30E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 8%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: C1.0
DSCOVR Satellite Solar Wind Day Averaged Data for 27 Jul
Speed: 389 km/sec Density: 2.5 p/cc Temp: 28000 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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