[ips-sf] IPS Summary Forecast for 07 June - issued 2334UT/06-Jun-2013

rwc rwc at ips.gov.au
Fri Jun 7 09:34:09 EST 2013

There are only a few small and magnetically simple sunspot regions on
the Sun. Since X-ray flares are produced from large and magnetically
complex regions, flare activity is at very low levels and expected to
remain so for the next few days. However, several coronal mass
ejections (CMEs) are currently in flight towards the Earth due to
previous flare activity. The arrival of these is expected to cause
unsettled to active levels of disturbance in the geomagnetic field
over the next few days, which may reduce the density of the ionosphere
reducing the maximum useable frequency for HF radio communications,
particularly in southern and polar regions. These are relatively small
and slow CMEs, so the geomagnetic and ionospheric effects are expected
to be relatively minor.

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