:Product: Weekly Highlights and Forecasts
:Issued: 2001 Jun 05 2112 UT
Highlights of Solar and Geomagnetic Activity
28 May - 03 June 2001

Solar activity was low during most of the period, briefly dipping to
very low levels on 30 May. Isolated, low-level C-class subflares
occurred during most of the period from a few sunspot groups of
moderate size and minor magnetic complexity.

Data were available from the Advanced Composition Explorer (ACE)
spacecraft for most of the period. A high speed stream associated
with a negative polarity coronal hole commenced late on 01 June and
continued through 03 June. Increased velocities (peaks to 620 km/sec
on 02 June), low densities, and variable IMF Bz (maximum range plus
17 nT to minus 14 nT (GSM)) were observed during this stream. Solar
wind conditions recovered to near nominal values by 04 June.

There were no proton events detected during the period.

The greater than 2 MeV electron flux at geosynchronous orbit was at
normal levels throughout the period.

The geomagnetic field was at quiet to active levels on 28 May due to
waning CME effects. Mostly quiet to unsettled conditions occurred
during 29 May - 01 June. Activity increased to unsettled to minor
storm levels during 02 June due to coronal hole effects. Activity
decreased to quiet to unsettled levels during 03 June with active
periods at high latitudes as coronal hole effects declined.

Forecast of Solar and Geomagnetic Activity
06 June - 02 July 2001

Solar activity is expected to range from low to moderate levels
during the period. Isolated M-class flares will be possible during
the period.

No proton events are expected during the period.

The greater than 2 MeV electron flux at geosynchronous orbit is
expected to be at normal to moderate levels during most of the
period. However, high flux levels will be possible around 08 - 09
and 30 June.

The geomagnetic field is expected to be at quiet to unsettled levels
during most of the period, barring an Earth-directed CME. However,
active levels will be possible around 07 - 08 and 29 June due to
recurrent coronal hole effects.


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