:Product: Weekly Highlights and Forecasts
:Issued: 2001 Jul 17 2112 UT
Highlights of Solar and Geomagnetic Activity
09 - 15 July 2001

Solar activity ranged from very low to moderate levels. Activity was
at mostly very low levels through 13 July with isolated B-class
subflares. Activity increased to moderate levels on 14 July due to
an isolated M1/Sf flare at 14/2133 UTC from Region 9539 (S18, L =
165, class/area Eai/110 on 15 July), which began a gradual growth
phase on 12 July. Activity dropped to low levels on 15 July with
isolated C-class flares from Region 9539.

Data were available from the Advanced Composition Explorer (ACE)
spacecraft for most of the period. No significant coronal transients
or high speed streams were observed. Periods of sustained southward
IMF Bz occurred during 10 and 12 - 15 July with maximum southerly
deflections to minus 10 nT (GSM).

There were no proton events during the period.

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

Geomagnetic field activity was at quiet to active levels during 09 -
11 July with brief minor storm periods at high latitudes. Activity
decreased to quiet to unsettled levels during 12 - 13 July. Activity
increased to quiet to (isolated) minor storm levels during 14 - 15
July.

Forecast of Solar and Geomagnetic Activity
18 July - 13 August 2001

Solar activity is expected to range from low to moderate levels.
Isolated M-class flares will be possible during the period. There
will be a slight chance for a major flare during the period.

There will be a slight chance for a proton event 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.

The geomagnetic field is expected to be at quiet to unsettled levels
during most of the period, barring an Earth-directed CME. However,
active conditions will be possible during 18 July and 12 - 13 August
due to recurrent coronal hole effects.


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