:Product: Weekly Highlights and Forecasts
:Issued: 2001 Jul 31 2112 UT
Highlights of Solar and Geomagnetic Activity
23 - 29 July 2001

Activity was low during most of the period, briefly dipping to very
low levels on 26 July. Isolated B- and C-class subflares occurred
during most days. Region 9543 (S23, L = 076, class/area Eai/380 on
22 July) produced isolated C-class flares during 23 – 24 July as it
slowly developed. This region began to gradually decay on 25 July.
Region 9553 (N13, L = 009, class/area Dai/190 on 26 July) produced
isolated C-class subflares during 25 – 26 July as it grew at a
moderate pace before entering a decay phase late on 26 July. At the
close of the period, mostly small, simple sunspot groups populated
the disk.

Data were available from the Advanced Composition Explorer (ACE)
spacecraft for most of the period. A coronal hole-related high speed
stream was observed during 24 - 26 July with peak velocities near
600 km/sec on 25 - 26 July. Coronal hole effects subsided during 27
July.

There were no proton events during the period.

The greater than 2 MeV electron flux at geosynchronous orbit reached
high levels during 27 - 28 July.

Geomagnetic field activity was at quiet to active levels during 24 -
26 July due to coronal hole effects. Activity decreased to quiet to
unsettled levels for the rest of the period.

Forecast of Solar and Geomagnetic Activity
01 - 27 August 2001

Solar activity is expected to be at mostly low levels. However,
isolated M-class flares will be possible during the period.

No proton events are expected.

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 15 - 17 
and 23 - 24 August.

The geomagnetic field is expected to be at quiet to unsettled levels
during most of the period, barring an Earth-directed CME. However,
brief active periods will be possible during 01, 12 - 13, 21 - 22
and 27 August due to coronal hole effects.

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