[Ips-dsgr] ASWFC Daily Report - 11 March 26 issued 2330 UT on 11 Mar 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Thu Mar 12 10:30:48 AEDT 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/11 MARCH 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 11 MARCH AND FORECAST FOR 12 MARCH - 14 MARCH
STATUS INDICATORS SOL:** YELLOW ** MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 11 Mar: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 11 Mar: 124/77
1B. SOLAR FORECAST
12 Mar 13 Mar 14 Mar
Activity R0, chance R1 R0, chance R1 R0, chance R1
Fadeouts Possible Possible Possible
10.7cm/SSN 120/72 116/68 112/63
COMMENT: Solar activity on UT day 11-Mar was R0, with no solar
flares. There are currently seven numbered sunspots on the solar
disk. Active regions (AR) 4388 (S13W45, beta) and 4390 (N27E16,
beta) both underwent a period of mild growth followed by decay.
AR 4391 (N10E37, beta) has grown slightly. All other sunspot
regions are either stable or in decay. Despite the recent growth,
no sunspot show significant flaring potential and solar activity
is expected to be R0-R1 over 12-14 Mar.
S0 solar radiation storm conditions were observed on UT day 11-Mar.
S0 solar radiation storm conditions are expected over 12-14 Mar.
No CMEs were observed on UT day 11-Mar, although image availability
is limited.
The solar wind environment on UT day was mildly disturbed in the
beginning, but fell quiet towards the end. The solar wind speed
ranged from 570 to 400 km/s. The peak total interplanetary field
strength (IMF, Bt) was 6 nT and the north-south IMF component
range (Bz) was +4 to -6 nT. The solar wind environment is expected
to continue to return to background levels over 12-13 Mar. The
Earth may connect to a coronal hole by 14-Mar, at which time
the solar wind speed may increase.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 11 Mar: G0
Estimated Indices 11 Mar : A K
Australian Region 6 23222011
Cocos Island 3 22211010
Darwin 7 33221022
Townsville 7 23222022
Learmonth 6 32222021
Alice Springs 5 23122011
Gingin 5 22222021
Canberra 6 23222012
Kennaook Cape Grim 7 23232011
Hobart 7 23232011
Estimated Antarctic Regional K Indices 11 Mar :
Macquarie Island 11 23244011
Casey 18 34533132
Mawson 21 44433144
Observed Regional daily pc3 Indices 11 Mar :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 19 (Quiet)
Canberra 20 (Quiet)
Hobart 22 (Quiet to unsettled)
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 11 Mar : A
Fredericksburg 8
Planetary 9
Observed AFr/Ap Indices 10 Mar : A K
Fredericksburg 11
Planetary 14 3323 3432
2B. MAGNETIC FORECAST
Date Ap Conditions
12 Mar 7 G0
13 Mar 5 G0
14 Mar 5 G0, chance G1
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 11-Mar. G0-G1 geomagnetic conditions were observed
in the Antarctic region. G0 geomagnetic conditions are mostly
expected over 12-14 Mar, with some isolated periods of G1 possible
by the end of the period due to the onset of a coronal hole.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
11 Mar Normal-fair Normal Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
12 Mar Normal Normal Normal
13 Mar Normal Normal Normal
14 Mar Normal Normal Normal
COMMENT: HF radio propagation conditions on UT day 11-Mar were
normal to mildly degraded, particularly in the second half of
the day. HF radio propagation conditions are expected to be mostly
normal over 12-14 Mar.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
11 Mar 99
Observed Australian Regional MUFs
Cocos Island Region:
Near predicted monthly values.
Niue Island Region:
Near predicted monthly values.
Northern Australian Region:
Enhanced by 15% during local day.
Enhanced by 15% during local night.
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
12 Mar 100 Near predicted monthly values to 15% enhanced
13 Mar 105 Near predicted monthly values to 15% enhanced
14 Mar 110 Near predicted monthly values to 15% enhanced
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region on UT day 11-Mar were near predicted monthly values to
15% enhanced. MUFs are expected to be near predicted values to
15% enhanced over 12-14 Mar.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 10 Mar
Daily Proton Fluence >1 MeV: 3.1E+05
Daily Proton Fluence >10 MeV: 1.6E+04
Daily Electron Fluence >2 MeV: 4.30E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 6%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B4.7
DSCOVR Satellite Solar Wind Day Averaged Data for 10 Mar
Speed: 438 km/sec Density: 0.2 p/cc Temp: 79200 K Bz: -2 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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