[ips-sf] IPS Summary Forecast for 23 September - issued 2342UT/22-Sep-2013

[rwc]

Solar flare activity declined during the previous 24 hours and is
expected to be very low with a chance of a C-class flare on 23
September. An impressive solar prominence arching across the south
west limb of the solar disk erupted on 22 September. The event was
detected by the IPS Learmonth solar radio telescope commencing at
about 03:05 UT. The Learmonth H-alpha optical telescope subsequently
recorded the prominence erupting from the south west limb during 03:29
to 05:31 UT. SOHO spacecraft images showed the associated CME
expanding toward the south west starting at about 05:00 UT. Combined
SOHO and STEREO images suggest that the CME is not Earthward directed.
The solar wind speed declined from about 420 km/s to 380 km/s during
the previous 24 hours and is expected to increase later today due to
the arrival of the next episode of fast flows. A slow CME associated
with the prominence eruption on 19 September may also impact Earth
during 23-24 September. No geomagnetic storm is expected at this
stage. HF propagation conditions for Australian region are expected to
be slightly depressed or near predicted monthly values.

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