[Ips-dsgr] ASWFC Daily Report - 27 March 26 issued 2330 UT on 27 Mar 2026 [SEC=OFFICIAL]
Australian Space Weather Forecasting Centre
aswfc at bom.gov.au
Sat Mar 28 10:30:45 AEDT 2026
SUBJ: ASWFC DAILY SOLAR AND GEOPHYSICAL REPORT
ISSUED AT 2330UT/27 MARCH 2026
FROM THE AUSTRALIAN SPACE WEATHER FORECASTING CENTRE
SUMMARY FOR 27 MARCH AND FORECAST FOR 28 MARCH - 30 MARCH
STATUS INDICATORS SOL:** YELLOW ** MAG:** YELLOW ** ION: GREEN
ASWAS SCALE DESCRIPTION: https://bit.ly/3lmaMBx
-----------------------------------------------------------
1A. SOLAR SUMMARY
Activity 27 Mar: R0
Flares: none.
Observed 10.7 cm flux/Equivalent Sunspot Number for 27 Mar: 156/110
1B. SOLAR FORECAST
28 Mar 29 Mar 30 Mar
Activity R0-R1 R0-R1 R0-R1
Fadeouts Possible Possible Possible
10.7cm/SSN 158/112 155/109 155/109
COMMENT: Solar activity on UT day 27-Mar was R0. Solar regions
AR4401 (N24E04, beta) and AR4405 (S26E67, beta-gamma) are the
two most significant regions on the disk. Both these medium sized
regions show spot development. Solar region AR4405 is the more
active of the two producing numerous C class flares with AR4401
remaining relatively flare quiet. Other regions are smaller and
appear more stable with AR4400 (S13W90, beta) and AR4403 (N17E41,
beta) each producing an isolated low level C flare. Solar region
AR4400 is rotating off disk, over the southwest solar limb. There
are currently nine solar regions on the visible solar disk. All
other sunspot regions are either stable or in decay. Most are
smaller in size. In GOES 304 imagery a 15 degree long section
of filament with centre location at N50W05, lifted off from 27/10004UT.
Solar activity is expected to be R0-R1 over 28-30 Mar, with R1
flare activity possible from AR4405. No Earth directed CMEs have
been observed. A narrow southeast directed CME was observed from
27/0136UT and appears to be solar limb activity possibly due
to the base of a coronal streamer becoming unstable or associated
with plasma loop activity visible from AR4405 near the southeast
limb from 26/2304UT in GOES 304, and is not considered Earth
directed. A faint narrow southwest directed CME was observed
from 27/2000UT and is not considered significant. No CME appeared
associated with the high solar latitude filament eruption. S0
solar radiation storm conditions were observed on UT day 27-Mar.
S0 solar radiation storm conditions are expected over 28-30 Mar.
An isolated coronal hole is visible in the northwest solar quadrant
with centre longitude at W25. The solar wind speed on UT day
27-Mar was initially moderate slowly declining to light. The
solar wind ranged from 393 to 482 km/s and is currently at 393
km/s. The peak total interplanetary field strength (IMF, Bt)
was 6 nT and the north-south IMF component range (Bz) was +4
to -4 nT. The solar wind environment is expected to continue
to decline to near background levels on 28-Mar. Solar wind 27
day recurrence patterns suggest that the coronal hole located
in the northwest solar quadrant will moderately increase the
solar wind speed from late in the UT day on 29-Mar to 31-Mar.
The flux of electrons with an energy of greater than 2 MeV at
geosynchronous orbit as measured by the US GOES satellite has
been strongly enhanced, which is statistically associated with
the increased risk of geosynchronous satellite operational anomalies.
-----------------------------------------------------------
2A. MAGNETIC SUMMARY
Geomagnetic field for Australian Region 27 Mar: G0
Estimated Indices 27 Mar : A K
Australian Region 3 21101211
Cocos Island 3 13101110
Darwin 4 22111112
Townsville 4 21112112
Learmonth - --------
Alice Springs 3 21101111
Gingin 4 21111221
Canberra 3 11101211
Kennaook Cape Grim 4 21102211
Hobart 4 11102311
Estimated Antarctic Regional K Indices 27 Mar :
Macquarie Island 10 11005410
Casey 10 33322222
Mawson 32 33433366
Observed Regional daily pc3 Indices 27 Mar :
Darwin 0 (Quiet)
Townsville 0 (Quiet)
Learmonth NA
Alice Springs 0 (Quiet)
Gingin 31 (Quiet to unsettled)
Canberra 42 (Unsettled)
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 27 Mar : A
Fredericksburg 7
Planetary 7
Observed AFr/Ap Indices 26 Mar : A K
Fredericksburg 7
Planetary 10 3232 2322
2B. MAGNETIC FORECAST
Date Ap Conditions
28 Mar 8 G0
29 Mar 13 G0, chance G1 late in UT day
30 Mar 18 G0-G1
COMMENT: G0 geomagnetic conditions were observed in the Australian
region on UT day 27-Mar. G0-G2 geomagnetic conditions were observed
in the Antarctic region. G0 geomagnetic conditions are expected
on 28-Mar and for most of 29-Mar. The Earth is expected to enter
a moderate coronal hole wind stream late on 29-Mar with G0-G1
conditions likely 30-31 Mar.
-----------------------------------------------------------
3A. GLOBAL HF PROPAGATION SUMMARY
Latitude Band
Date Low Middle High
27 Mar Normal Fair-normal Fair
PCA Event : No event.
3B. GLOBAL HF PROPAGATION FORECAST
Latitude Band
Date Low Middle High
28 Mar Normal Normal Normal-fair
29 Mar Normal Normal Normal-fair
30 Mar Normal Normal-fair Fair
COMMENT: HF radio propagation on UT day 27-Mar were fair to normal,
with fair conditions at middle to high latitudes. HF radio propagation
conditions are expected to be mostly normal on 28-Mar and for
most of 29-Mar. HF conditions may become mildly degraded from
late in the UT day on 29-Mar through to 31-Mar at middle to high
latitudes, particularly during local night hours.
-----------------------------------------------------------
4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
Date T index
27 Mar 96
Observed Australian Regional MUFs
Cocos Island Region:
Enhanced by 35% during local day.
Enhanced by 15% during local night.
Niue Island Region:
Enhanced by 30% during local day.
Near predicted monthly values during local night.
Northern Australian Region:
Enhanced by 20% during local day.
Generally near predicted monthly values during
the local night, with only Darwin enhanced 50%.
Southern Australian Region:
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
28 Mar 95 Near predicted monthly values
29 Mar 95 Near predicted monthly values
30 Mar 80 Depressed 10 to 15%/near predicted monthly values
COMMENT: Maximum usable frequencies (MUFs) in the Australian
region were generally near predicted values to 20% enhanced.
Strong enhancements of up to 50% were observed at Darwin during
the local night. Scintillation was observed during the interval
27/1130-1155UT at Darwin. Spread F was observed at Hobart and
Brisbane during local night hours. MUFs are expected to be near
predicted monthly values for 28-29-Mar. Southern Australian region
MUFs may become 15% depressed during 30-31 Mar in association
with mild geomagnetic activity associated with a coronal hole
wind stream.
-----------------------------------------------------------
5. SPACE ENVIRONMENT SUMMARY
GOES satellite data for 26 Mar
Daily Proton Fluence >1 MeV: 3.7E+06
Daily Proton Fluence >10 MeV: 1.7E+04
Daily Electron Fluence >2 MeV: 4.80E+08 (moderate fluence)
Electron Fluence Daily Deep Dielectric Discharge Probability:23%
Fluence (flux accumulation over 24hrs)/ cm2-ster-day.
X-ray background: C1.0
DSCOVR Satellite Solar Wind Day Averaged Data for 26 Mar
Speed: 463 km/sec Density: 0.0 p/cc Temp: 83600 K Bz: 0 nT
(Courtesy Space Weather Prediction Center, Boulder USA)
-----------------------------------------------------------
Australian Space Weather Forecasting Centre
Bureau of Meteorology
ASWFC at bom.gov.au
www.bom.gov.au | www.sws.bom.gov.au
More information about the ips-dsgr
mailing list