[Ips-dsgr] ASWFC Daily Report - 22 August 26 issued 2330 UT on 22 Aug 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sun Aug 23 09:30:49 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/22 AUGUST 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 22 AUGUST AND FORECAST FOR 23 AUGUST - 25 AUGUST
STATUS INDICATORS SOL:** YELLOW ** MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 22 Aug: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 22 Aug: 124/77
1B. SOLAR FORECAST
23 Aug 24 Aug 25 Aug
Activity R0-R1 R0-R1 R0-R1
Fadeouts Possible Possible Possible
10.7cm/SSN 120/72 115/66 110/60
COMMENT: Solar flare activity on UT day 22-Aug was at the R0
level, with no notable flares. There are currently four numbered
active regions (ARs) visible on the solar disk and one unnumbered
region. AR 4513 (N04E43, beta-gamma) is the largest and most
magnetically complex region on the solar disk. This region may
possess a delta spot in its eastern most spots but has been flare-quiet
for the past two days. All other numbered ARs are stable. An
unnumbered region has developed at around N07W27, with beta magnetic
classification. Solar flare activity is expected to be at R0-R1
levels over 23-25 Aug due to the magnetic complexity of 4513
and its recent flare activity. Solar radiation storm conditions
were at the S0 level on 22-Aug, with the >10 MeV proton flux
raised but in decline. S0 conditions are expected over 23-25
Aug, with a chance of S1 on 23-Aug due to the currently enhanced
>10 MeV proton flux. The enhanced proton conditions are due to
a long duration flare observed on 21-Aug. No Earth-directed coronal
mass ejections (CMEs) have been observed. The solar wind speed
on UT day 22-Aug decreased slightly as coronal hole high speed
wind stream effects waned, ranging between 415 and 505 km/s,
and is currently near 440 km/s. The peak total interplanetary
magnetic field strength (IMF, Bt) was 6 nT and the north-south
IMF component (Bz) range was -3 to +4 nT. The solar wind speed
is expected to continue to decline over 23-25 Aug as coronal
hole high speed wind stream effects wane.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 22 Aug: G0
Estimated Indices 22 Aug : A K
Australian Region 1 11100000
Cocos Island 1 11110000
Darwin 2 11110011
Townsville 3 12101012
Learmonth 1 11100000
Alice Springs 0 00100000
Gingin 1 11100000
Canberra 0 01000001
Kennaook Cape Grim 0 00010000
Hobart 0 10010000
Estimated Antarctic Regional K Indices 22 Aug :
Macquarie Island 0 00020000
Casey 6 33221011
Mawson 7 32212103
Observed Regional daily pc3 Indices 22 Aug :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 2 (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 22 Aug : A
Fredericksburg 5
Planetary 5
Observed AFr/Ap Indices 21 Aug : A K
Fredericksburg 9
Planetary 8 3222 2122
2B. MAGNETIC FORECAST
Date Ap Conditions
23 Aug 3 G0
24 Aug 4 G0
25 Aug 4 G0
COMMENT: G0 geomagnetic conditions were observed at the planetary
level and Australian and Antarctic regions on UT day 22-Aug.
Mostly G0 conditions were observed in the Antarctic region, with
a period of G1 observed at Mawson. G0 planetary geomagnetic conditions
are expected over 22-24 Aug.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
22 Aug Normal-fair Normal Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
23 Aug Normal Normal Normal
24 Aug Normal Normal Normal
25 Aug Normal Normal Normal
COMMENT: HF radio propagation conditions on UT day 22-Aug were
mostly normal, with some degradations observed at low latitudes
and high latitudes in the northern hemisphere. HF radio propagation
conditions are expected to be mostly normal over 23-25 Aug. Shortwave
fadeouts are possible.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
22 Aug 77
Observed Australian Regional MUFs
Cocos Island Region:
No data available during local day.
No data available during local night.
Niue Island Region:
No data available during local day.
No data available during local night.
Northern Australian Region:
Near predicted monthly values during local day.
Enhanced by 15% during local night.
Southern Australian Region:
Near predicted monthly values.
Antarctic Region (Casey/Davis/Mawson):
Enhanced by 15% over the UT day.
Monthly T index:
Month T index
Jul 75
Aug 64
Sep 61
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
23 Aug 80 Near to 15% above predicted monthly values
24 Aug 80 Near to 15% above predicted monthly values
25 Aug 80 Near to 15% above predicted monthly values
COMMENT: ASWFC SWF HF Communications Warning 76 was issued on
22 August and is current for 23-25 Aug. Maximum usable frequencies
(MUFs) in the Australian region on UT day 22-Aug were near predicted
monthly values, with enhancements observed in the northern Australian
region during local night. Spread F was observed at Perth during
local night hours. MUFs are expected to be near predicted monthly
values to 15% enhanced over 23-25 Aug. Shortwave fadeouts are
possible.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 21 Aug
Daily Proton Fluence >1 MeV: 3.2E+05
Daily Proton Fluence >10 MeV: 5.3E+04
Daily Electron Fluence >2 MeV: 7.70E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 9%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B9.6
Solar Wind Day Averaged Data for 21 Aug
Speed: 489 km/sec Density: 3.0 p/cc Temp: 123000 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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