[Ips-dsgr] ASWFC Daily Report - 30 March 26 issued 2332 UT on 30 Mar 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Tue Mar 31 10:32:13 AEDT 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/30 MARCH 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 30 MARCH AND FORECAST FOR 31 MARCH - 02 APRIL
STATUS INDICATORS SOL:** YELLOW ** MAG:** RED ** ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 30 Mar: R3
Flares Max Fadeout Freq. Sectors
X1.5 0319UT probable all E. Asia/Aust.
Observed 10.7 cm flux/Equivalent Sunspot Number for 30 Mar: 152/107
1B. SOLAR FORECAST
31 Mar 01 Apr 02 Apr
Activity R1-R2 R1-R2 R1-R2
Fadeouts Possible Possible Possible
10.7cm/SSN 152/107 155/109 155/109
COMMENT: Solar activity on UT day 30-Mar was R3, with an isolated
X1.4 flare observed from AR4405 (S26E34, beta) from 0247UT. There
are currently nine Active Regions on the Solar disk. Solar region
AR4401 (N24W36, beta) continues to show decay in its trailer
spots and umbral convergence in its leader spot. AR4303 (N15E05,
beta) has shown some east-west separation. All other sunspot
regions are either stable or in decay. Solar activity is expected
to be R1-R2 over 31-Mar to 02-Apr. An Earth directed CME was
observed, following the X1.4 flare. It was first visible on STEREO-A
imagery at 0323UT and is also visible on LASCO imagery. This
CME has been subsequently modelled, with a glancing blow anticipated
late on the UT day of the 31-Mar. S0 solar radiation storm conditions
were observed on UT day 30-Mar. S0 solar radiation storm conditions
are expected over 31-Mar to 02-Apr. An isolated coronal hole,
visible in the northwest solar quadrant, will pass beyond the
western limb in the next 24 hours. Another is visible in the
southeast solar quadrant. The solar wind speed on UT day 30-Mar
was largely stable and moderately elevated, due to the solar
wind stream from the coronal hole in the northwest solar quadrant.
The solar wind ranged from 430 to 500 km/s and is currently at
440 km/s. The peak total interplanetary field strength (IMF,
Bt) was 12 nT and the north-south IMF component range (Bz) was
+12 to -7 nT. The IMF Bz component was predominantly southward
during the interval 30/0800-1420UT. The solar wind speed is expected
to remain at these levels over the 31-Mar to 02-Apr. The coronal
hole in the southeast solar quadrant is beginning to approach
the solar central meridian and 27 day recurrence patterns suggest
the Earth will enter the wind stream from this hole on 03-Apr.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 30 Mar: G0
Estimated Indices 30 Mar : A K
Australian Region 6 22222221
Cocos Island 5 22222110
Darwin 9 33222222
Townsville 8 23222222
Learmonth - --------
Alice Springs 5 22222111
Gingin 7 32222221
Canberra 6 22222221
Kennaook Cape Grim 6 22222211
Hobart 7 22322211
Estimated Antarctic Regional K Indices 30 Mar :
Macquarie Island 14 12453211
Casey 17 45432122
Mawson 15 23433242
Observed Regional daily pc3 Indices 30 Mar :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth NA
Alice Springs 0 (Quiet)
Gingin 6 (Quiet)
Canberra 0 (Quiet)
Hobart 13 (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 30 Mar : A
Fredericksburg 14
Planetary 17
Observed AFr/Ap Indices 29 Mar : A K
Fredericksburg 11
Planetary 14 4432 3312
2B. MAGNETIC FORECAST
Date Ap Conditions
31 Mar 58 G3, chance G4
01 Apr 69 G3
02 Apr 45 G2
COMMENT: ASWFC Geomagnetic Warning 21 was issued on 27 March
and is current for 29-31 Mar. G0 geomagnetic conditions were
observed in the Australian region on UT day 29-Mar. G0-G1 geomagnetic
conditions were observed in the Antarctic region. An Earth directed
CME is anticipated to arrive at approximately 31/1600UT +/- 10
hours. This is expected to give rise to G3, chance G4 conditions
on 31-Mar, giving way to G3 on 01-Apr. G2 conditions are expected
on the 02-Apr.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
30 Mar Normal Normal Normal
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
31 Mar Normal Normal-fair Fair
01 Apr Fair Poor-fair Poor
02 Apr Fair Fair Fair
COMMENT: HF radio propagation on UT day 30-Mar were normal. HF
conditions are expected to be degraded during the next three
days at all latitudes, due to a CME anticipated to arrive on
the 31-Apr.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
30 Mar 111
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 35% during local day.
Enhanced by 35% during local night.
Niue Island Region:
Near predicted monthly values.
Northern Australian Region:
Near predicted monthly values during local day.
Enhanced by 20% during local night.
Southern Australian Region:
Mostly near predicted monthly values.
Enhanced by 25% after local dawn.
Antarctic Region (Casey/Davis/Mawson):
Depressed by 25% 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
31 Mar 90 Near predicted monthly values
01 Apr 80 Near predicted monthly values
02 Apr 80 Near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region on UT day 30-Mar were generally near predicted values
with enhancements of up to 25% after local dawn in the Southern
Australian region. Enhancements of up to 20% were also seen in
the Northern Australian region during local night. Spread F was
observed at Hobart during local night. MUFs are
expected to be near predicted monthly values over 31-Mar to 02-Apr.
While ionospheric depression is anticipated due to a CME expected
to arrive on the 31-Mar, the ionosphere is currently enhanced
beyond predicted monthly values. As such, this activity will
bring MUFs to near predicted monthly values. Degraded HF conditions
are likely to be experienced during local night hours over the
next three days.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 29 Mar
Daily Proton Fluence >1 MeV: 5.4E+05
Daily Proton Fluence >10 MeV: 1.6E+04
Daily Electron Fluence >2 MeV: 4.60E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 6%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: B8.4
DSCOVR Satellite Solar Wind Day Averaged Data for 29 Mar
Speed: 367 km/sec Density: 1.3 p/cc Temp: 39500 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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