[Ips-dsgr] ASWFC Daily Report - 29 March 26 issued 2330 UT on 29 Mar 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Mon Mar 30 10:30:43 AEDT 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/29 MARCH 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 29 MARCH AND FORECAST FOR 30 MARCH - 01 APRIL
STATUS INDICATORS SOL:** YELLOW ** MAG:** YELLOW ** ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
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1A. SOLAR SUMMARY
Activity 29 Mar: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 29 Mar: 158/112
1B. SOLAR FORECAST
30 Mar 31 Mar 01 Apr
Activity R0,chance R1 R0,chance R1 R0,chance R1
Fadeouts Possible Possible Possible
10.7cm/SSN 155/109 152/107 155/109
COMMENT: Solar activity on UT day 29-Mar was R0, with no significant
flares observed. Solar region AR4401 (N24W23, beta) continues
to show decay in its trailer spots and shows umbral convergence in
its leader spot. Region AR4405 (S26E42, beta) may be in initial
decay with the umbra within its leader spot appearing to separate
and the surrounding penumbra reducing in area. Other solar regions
are smaller in size. There are currently nine solar regions on
the visible solar disk. All other sunspot regions are either
stable or in decay. Solar activity is expected to be R0, chance
R1 over 30-Mar to 01-Apr. No Earth directed CMEs have been observed.
S0 solar radiation storm conditions were observed on UT day 29-Mar.
S0 solar radiation storm conditions are expected over 30-Mar
to 01-Apr. An isolated coronal hole is visible in the northwest
solar quadrant and another is visible in the southeast solar
quadrant. The solar wind speed on UT day 29-Mar was initially
light then increased to moderate as the Earth entered the solar
wind stream from the coronal hole in the northwest solar quadrant.
The solar wind ranged from 335 to 470 km/s and is currently at
440 km/s. The peak total interplanetary field strength (IMF,
Bt) was 13 nT and the north-south IMF component range (Bz) was
+11 to -7 nT. The IMF Bz component was mildly southward during
the interval 29/0000-0800UT. The solar wind speed is expected
to be moderate to strong during the interval 30-Mar to 31-Mar.
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. The flux of electrons with an energy of greater
than 2 MeV at geosynchronous orbit as measured by the US GOES
satellite has been recently enhanced though may be now reducing,
and is statistically associated with the increased risk of
geosynchronous satellite operational anomalies.
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2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 29 Mar: G0
Estimated Indices 29 Mar : A K
Australian Region 8 22232311
Cocos Island 4 21112210
Darwin 10 22233322
Townsville 10 23233321
Learmonth - --------
Alice Springs 8 12233311
Gingin 7 22222321
Canberra 7 12232311
Kennaook Cape Grim 9 22242311
Hobart 9 22242311
Estimated Antarctic Regional K Indices 29 Mar :
Macquarie Island 23 13364510
Casey 10 33422211
Mawson 18 44523311
Observed Regional daily pc3 Indices 29 Mar :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth NA
Alice Springs 0 (Quiet)
Gingin 0 (Quiet)
Canberra 4 (Quiet)
Hobart 20 (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 29 Mar : A
Fredericksburg 13
Planetary 18
Observed AFr/Ap Indices 28 Mar : A K
Fredericksburg 8
Planetary 11 3233 2213
2B. MAGNETIC FORECAST
Date Ap Conditions
30 Mar 19 G0-G1
31 Mar 15 G0, chance G1
01 Apr 8 G0
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. Periods of
G1 conditions are possible over over 30-31 Mar due to a coronal
hole wind stream.
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3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
29 Mar Normal Fair-normal Fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
30 Mar Normal Fair-normal Fair
31 Mar Normal Fair-normal Fair
01 Apr Normal Normal Normal-fair
COMMENT: HF radio propagation on UT day 29-Mar were fair to normal,
with fair conditions at middle to high latitudes. HF conditions
are expected to be mildly degraded during 30-31 Mar at middle
to high latitudes, particularly during local night hours.
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4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
29 Mar 84
Observed Australian Regional MUFs
Cocos Island Region:
Near predicted monthly values during local day.
Depressed by 20% during local night.
Niue Island Region:
Near predicted monthly values.
Northern Australian Region:
Mostly near predicted monthly values.
Southern Australian Region:
Near predicted monthly values during local day.
Depressed by 15% during local night.
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
30 Mar 95 Near predicted monthly values
31 Mar 70 Depressed 10 to 15%/near predicted monthly values
01 Apr 80 Near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region on UT day 29-Mar were generally near predicted values
with 15% depressions observed during local night hours in the
southern Australian region. Spread F was observed at Hobart and
Perth during the local night. MUFs are expected to be near predicted
monthly values on 30-Mar and 15% depressed to near predicted
monthly values on 31-Mar due to expected mild geomagnetic activity
associated with a coronal hole wind stream. Mildly degraded HF
conditions may be experienced during local night hours during
30-31 Mar.
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5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 28 Mar
Daily Proton Fluence >1 MeV: 8.7E+05
Daily Proton Fluence >10 MeV: 1.6E+04
Daily Electron Fluence >2 MeV: 5.00E+07 (normal fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability: 7%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: C1.0
DSCOVR Satellite Solar Wind Day Averaged Data for 28 Mar
Speed: 372 km/sec Density: 0.4 p/cc Temp: 36900 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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