[Ips-dsgr] ASWFC Daily Report - 12 March 26 issued 2330 UT on 12 Mar 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Fri Mar 13 10:30:45 AEDT 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/12 MARCH 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 12 MARCH AND FORECAST FOR 13 MARCH - 15 MARCH
STATUS INDICATORS SOL:** YELLOW ** MAG:** YELLOW ** ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 12 Mar: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 12 Mar: 121/73
1B. SOLAR FORECAST
13 Mar 14 Mar 15 Mar
Activity R0, chance R1 R0, chance R1 R0, chance R1
Fadeouts Possible Possible Possible
10.7cm/SSN 120/72 115/66 110/60
COMMENT: Solar activity on UT day 12-Mar was R0, with no solar
flares. There are currently eight numbered sunspots on the solar
disk. Active regions (ARs) 4191 (N05E20, beta) and 4193 (N13E35,
beta) have shown slight growth, but all other sunspots are either
stable or in decay. Solar activity over 13-15 Mar is expected
to be R0, chance R1.
No Earth-directed CMEs were observed on UT day 12-Mar.
S0 solar radiation storm conditions were observed on UT day 12-Mar.
S0 solar radiation storm conditions are expected over 13-15 Mar.
On UT day 12-Mar the solar wind environment was mostly near background
levels. The solar wind speed ranged from 400-470 km/s. The peak total
interplanetary field strength (IMF, Bt) was 7 nT and the north-south
IMF component range (Bz) was +7 to -6 nT. The solar wind environment
is expected to be mostly at background levels on 13-Mar, before coming
disturbed on 14-Mar due to a recurrent coronal hole. This disturbance
is expected to continue into 15-Mar.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 12 Mar: G0
Estimated Indices 12 Mar : A K
Australian Region 8 22213312
Cocos Island 3 11112210
Darwin 7 22212322
Townsville 7 22212322
Learmonth 8 22213322
Alice Springs 8 22213312
Gingin 8 32212322
Canberra 7 21213312
Kennaook Cape Grim 7 21213312
Hobart 7 21213312
Estimated Antarctic Regional K Indices 12 Mar :
Macquarie Island 12 11124511
Casey 24 36532223
Mawson 21 44323353
Observed Regional daily pc3 Indices 12 Mar :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (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 12 Mar : A
Fredericksburg 7
Planetary 8
Observed AFr/Ap Indices 11 Mar : A K
Fredericksburg 7
Planetary 9 3421 2021
2B. MAGNETIC FORECAST
Date Ap Conditions
13 Mar 12 G0
14 Mar 18 G1, chance G2
15 Mar 15 G0-G1
COMMENT: ASWFC Geomagnetic Warning 15 was issued on 12 March
and is current for 14-15 Mar. G0 geomagnetic conditions were
observed on UT day 12-Mar in the Australian region. G0-G2 geomagnetic
conditions were observed in the Antarctic region. G0 geomagnetic
conditions are expected on UT day 13-Mar. G1 geomagnetic conditions
are expected on 14-Mar due to the onset of a coronal hole, with
a chance for isolated periods of G2. G0-G1 geomagnetic conditions
are expected on 15-Mar as the coronal hole effects diminish.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
12 Mar Normal Normal-fair Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
13 Mar Normal Normal Normal
14 Mar Normal Normal-fair Fair
15 Mar Normal Normal-fair Normal-fair
COMMENT: HF radio propagation conditions were normal to mildly
degraded on UT day 12-Mar. HF radio propagation conditions are
expected to be normal on 13-Mar, then degraded over 14-15 Mar
due to anticipated geomagnetic activity.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
12 Mar 92
Observed Australian Regional MUFs
Cocos Island Region:
Mostly near predicted monthly values.
Niue Island Region:
Near predicted monthly values.
Northern Australian Region:
Mostly near predicted monthly values.
Southern Australian Region:
Mostly near predicted monthly values.
Antarctic Region (Casey/Davis/Mawson):
Near predicted monthly values over the UT day.
Monthly T index:
Month T index
Feb 98
Mar 87
Apr 85
4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
Date T index MUFs
13 Mar 100 Near predicted monthly values
14 Mar 85 Near predicted monthly values
15 Mar 90 Near predicted monthly values to 15% depressed
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region on UT day 12-Mar were mostly near predicted monthly values.
Signal spreading was observed in Hobart during local night hours.
MUFs are expected to be near predicted values over 13-14 Mar,
then up to 15% depressed by 15-Mar due to anticipated geomagnetic
activity.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 11 Mar
Daily Proton Fluence >1 MeV: 4.8E+05
Daily Proton Fluence >10 MeV: 1.7E+04
Daily Electron Fluence >2 MeV: 9.10E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability:10%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B5.5
DSCOVR Satellite Solar Wind Day Averaged Data for 11 Mar
Speed: 455 km/sec Density: 0.2 p/cc Temp: 94700 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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