:Product: Weekly Highlights and Forecasts
:Issued: 2001 Jun 12 2112 UT
Highlights of Solar and Geomagnetic Activity
04 - 10 June 2001

Solar activity was at low to moderate levels. Moderate activity
occurred during 04 - 05 June due to isolated, low-level M-class
flares from Region 9488 (S18, L = 288, class/area Cko/290 on 04
June) (please refer to the Energetic Events list for flare
particulars). These flares occurred as a weak delta magnetic
configuration formed, then dissipated near the leader spots. Region
9488 entered a gradual decay phase on 08 June, but maintained a
minor degree of magnetic complexity through the rest of the period
as it produced isolated C-class subflares. Another event of note was
a C3/Sf flare from Region 9474 (N20, L = 037, class/area Dao/060 on
29 May), which was a spotless plage area at the time of the flare.
This flare was associated with a Type II radio sweep, a small
filament disappearance, and a proton enhancement at greater than 10
MeV. Activity dropped to low levels during 06 - 07 June due to
occasional C-class flares from a few sunspot groups of minor
magnetic complexity. Activity increased to moderate levels on 08
June due to an M1/Sf flare from Region 9494 (S08, L = 309,
class/area Eki/410 on 10 June). The flare occurred during a gradual
growth phase in Region 9494, which continued through the remainder
of the period. Activity decreased to low levels for the rest of the
period with isolated C-class subflares.

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 08 June and
continued through 10 June. Increased velocities (peaks to 710 km/sec
on 10 June), low densities, and variable IMF Bz (maximum range plus
to minus 10 nT (GSM)) were observed during this stream. Solar wind
conditions recovered to near nominal values late on 10 June.

There were no proton events detected during the period. However, a
small proton enhancement occurred during 04 June in the wake of the
C3 X-ray flare mentioned above.

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

The geomagnetic field was disturbed during 09 - 10 June due to
coronal hole effects. Unsettled to minor storm levels were observed
during this disturbance. Quiet to unsettled levels occurred during
the rest of the period.

Forecast of Solar and Geomagnetic Activity
13 June - 09 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, there will be a chance for high levels around 30
June and 07 - 08 July.

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 29 June and 06 - 07 July due
to coronal hole effects.

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