[ips-sf] ASWFC Summary Forecast for 24 April - issued 2320UT/23-Apr-2023 [SEC=OFFICIAL]

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An Earth-directed halo CME first observed on 21-Apr has arrived on UT
day 23-Apr, with a strong shock in the solar wind detected at
23/1700UT. G4 planetary geomagnetic conditions have been observed
since. Mostly G2 geomagnetic conditions were observed in Australia,
with an isolated period of G3 observed at Hobart. Solar activity on UT
day 24-Apr is expected to be at the R0 level, with a chance of R1.
G1-G2 geomagnetic conditions are expected on 24-Apr as CME impacts
abate. The solar wind is expected to be very strong to strong. S1
solar radiation conditions were briefly observed on 23-Apr, with
further periods of S1 possible on 24-Apr. Maximum usable frequencies
(MUFs) are expected to be near predicted monthly values to 15%
depressed, particularly in southern Australian regions. HF radio
communication conditions are expected to be degraded, particularly
during local night and local dawn hours.

Australian Space Weather Forecasting Centre
Bureau of Meteorology
ASWFC at bom.gov.au
www.bom.gov.au | www.sws.bom.gov.au