[Ips-dsgr] ASWFC Daily Report - 09 May 26 issued 2330 UT on 09 May 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sun May 10 09:30:45 AEST 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/09 MAY 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 09 MAY AND FORECAST FOR 10 MAY - 12 MAY
STATUS INDICATORS SOL:** YELLOW ** MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 09 May: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 09 May: 122/75
1B. SOLAR FORECAST
10 May 11 May 12 May
Activity R1, chance of R2 R1, chance of R2 R1, chance of R2
Fadeouts Possible Possible Possible
10.7cm/SSN 122/75 120/72 118/70
COMMENT: Solar flare activity on UT day 09-May was at the R0
level, with several low level C-class flares observed. There
are currently five numbered sunspot regions visible on the solar
disk. Active Region (AR) 4432 (N12W37, beta-gamma) is the largest
and most magnetically complex region on the disk. This region
has exhibited spot development over the UT day. Newly numbered
AR 4436 (N18E70, beta) recently rotated over the eastern limb
and appears stable. All other sunspot regions are either stable
or in decay. Solar flare activity is expected to be at the R1
level over 10-12 May, with a chance of R2 primarily due to the
development and complexity of region 4432. S0 solar proton conditions
were observed on UT day 09-May. S0 solar proton conditions are
expected over 10-12 May. No Earth-directed coronal mass ejections
(CMEs) have been observed. The solar wind speed on UT day 09-May
decreased, ranging from 550 to 460 km/s and is currently near
460 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 +5 nT. The solar wind speed is expected to decline
over 10-12 May due to waning coronal hole high speed wind stream
effects.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 09 May: G0
Estimated Indices 09 May : A K
Australian Region 3 21110111
Cocos Island 2 11110110
Darwin 3 21110112
Townsville 3 21110112
Learmonth 2 21110110
Alice Springs 2 21010111
Gingin 2 20110111
Canberra 2 11020110
Kennaook Cape Grim 2 11020110
Hobart 2 11020110
Estimated Antarctic Regional K Indices 09 May :
Macquarie Island 3 10031100
Casey 6 33211111
Mawson 11 33222214
Observed Regional daily pc3 Indices 09 May :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 0 (Quiet)
Canberra 2 (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 09 May : A
Fredericksburg 7
Planetary 7
Observed AFr/Ap Indices 08 May : A K
Fredericksburg 12
Planetary 12 3223 3323
2B. MAGNETIC FORECAST
Date Ap Conditions
10 May 6 G0
11 May 6 G0
12 May 6 G0
COMMENT: G0 geomagnetic conditions were observed in the planetary,
Australian and Antarctic regions on UT day 09-May. G0 planetary
geomagnetic conditions are expected over 10-12 May.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
09 May Normal Normal-fair Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
10 May Normal Normal Normal
11 May Normal Normal Normal
12 May Normal Normal Normal
COMMENT: Global ionospheric conditions were mostly normal on
UT day 09-May, with some fair conditions observed in the southern
hemisphere later in the UT day. Ionospheric conditions are expected
to be normal over 10-12 May. Shortwave fadeouts are possible.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
09 May 69
Observed Australian Regional MUFs
Cocos Island Region:
No data available during local day.
No data available during local night.
Niue Island Region:
Near predicted monthly values during local day.
Depressed by 25% during local night.
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
Apr 74
May 71
Jun 68
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
10 May 60 Near predicted monthly values
11 May 60 Near predicted monthly values
12 May 60 Near predicted monthly values
COMMENT: Maximum Usable Frequencies (MUFs) in the Australian
region were near predicted monthly values on UT day 09-May. Spread
F was observed at Hobart during local night hours. MUFs are expected
to be near predicted monthly values over 10-12 May. Shortwave
fadeouts are possible.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 08 May
Daily Proton Fluence >1 MeV: 2.1E+06
Daily Proton Fluence >10 MeV: 1.8E+04
Daily Electron Fluence >2 MeV: 1.60E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 3%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B6.3
DSCOVR Satellite Solar Wind Day Averaged Data for 08 May
Speed: 526 km/sec Density: 4.3 p/cc Temp: 134000 K Bz: 3 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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