[Ips-dsgr] ASWFC Daily Report - 25 March 26 issued 2330 UT on 25 Mar 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Thu Mar 26 10:30:50 AEDT 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/25 MARCH 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 25 MARCH AND FORECAST FOR 26 MARCH - 28 MARCH
STATUS INDICATORS SOL:** YELLOW ** MAG:GREEN ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 25 Mar: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 25 Mar: 140/94
1B. SOLAR FORECAST
26 Mar 27 Mar 28 Mar
Activity R0-R1 R0-R1 R0-R1
Fadeouts Possible Possible Possible
10.7cm/SSN 145/99 142/96 140/94
COMMENT: Solar flare activity on UT day 25-Mar was R0, with no
solar flares. There are currently seven numbered sunspots on
the disk. Active region (AR) 4398 (S15W24, beta) showed some
minor growth but appeared to mature. AR4401 (N24E23, beta) developed
larger trailer spots. All other sunspots are either stable or
in decay. Solar activity is expected to be R0-R1 over 26-28 Mar.
No Earth directed CMEs were observed on UT day 25-Mar.
S0 solar radiation storm conditions were observed on UT day 25-Mar.
S0 solar radiation storm conditions are expected over 26-28 Mar.
On UT day 25-Mar the solar wind environment was mildly disturbed,
likely due to a weak passing transient. The solar wind speed
ranged from 440 to 600 km/s. The peak interplanetary field strength
(IMF, Bt) was 10 nT and the north-south IMF component range (Bz)
was +9 to -8 nT. The solar wind environment is expected to be
mostly near background levels over 26-27 Mar, and possibly experience
an enhancement due to a coronal hole on 28-Mar.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 25 Mar: G0
Estimated Indices 25 Mar : A K
Australian Region 8 22431120
Cocos Island 5 22320110
Darwin - --------
Townsville 9 22431121
Learmonth 8 22431120
Alice Springs 8 22431111
Gingin 8 32331220
Canberra 11 22531121
Kennaook Cape Grim 11 22532120
Hobart 11 22531120
Estimated Antarctic Regional K Indices 25 Mar :
Macquarie Island 14 23542120
Casey 20 44543221
Mawson 30 45642251
Observed Regional daily pc3 Indices 25 Mar :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth 0 (Quiet)
Alice Springs 0 (Quiet)
Gingin 7 (Quiet)
Canberra 8 (Quiet)
Hobart 4 (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 25 Mar : A
Fredericksburg 15
Planetary 17
Observed AFr/Ap Indices 24 Mar : A K
Fredericksburg 12
Planetary 16 3434 3233
2B. MAGNETIC FORECAST
Date Ap Conditions
26 Mar 11 G0
27 Mar 8 G0
28 Mar 14 G0-G1
COMMENT: ASWFC Geomagnetic Warning 20 was issued on 24 March
and is current for 24-26 Mar. G0 geomagnetic conditions were
observed in the Australian region on UT day 25-Mar. G0-G2 geomagnetic
conditions were observed in the Antarctic region. An isolated
period of G1 was observed on the planetary scale. Mostly G0 geomagnetic
conditions are expected over 26-28 Mar. Isolated periods of G1
may be possible on 28-Mar due to connection with a coronal hole.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
25 Mar Normal-fair Normal Normal-fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
26 Mar Normal Normal Normal
27 Mar Normal Normal Normal
28 Mar Normal Normal Normal-fair
COMMENT: HF radio propagation conditions on UT day 25-Mar were
mostly normal, with some possible degradations from 0600 UT.
Further degradations were noted in the northern hemisphere from
1600 UT. HF radio propagation conditions are expected to be mostly
normal over 26-27 Mar. Some mild degradations are possible by
28-Mar due to expected connection to a coronal hole.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
25 Mar 77
Observed Australian Regional MUFs
Cocos Island Region:
Near predicted monthly values during local day.
Depressed by 30% during local night.
Niue Island Region:
Near predicted monthly values.
Northern Australian Region:
Near predicted monthly values.
Southern Australian Region:
Mostly near predicted monthly values.
Depressed by 20% after local dawn.
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
26 Mar 90 Near predicted monthly values
27 Mar 100 Near predicted monthly values
28 Mar 105 Near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region on UT day 25-Mar were near predicted values to 20% depressed.
Spread-F was observed in Hobart and conditions were degraded
in Darwin during local night hours. MUFs are expected to continue
recovering to near predicted monthly values over 26-28 Mar.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 24 Mar
Daily Proton Fluence >1 MeV: 1.3E+06
Daily Proton Fluence >10 MeV: 2.4E+04
Daily Electron Fluence >2 MeV: 5.00E+08 (moderate fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability:23%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B5.9
DSCOVR Satellite Solar Wind Day Averaged Data for 24 Mar
Speed: 584 km/sec Density: 0.0 p/cc Temp: 122000 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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