:Product: Weekly Highlights and Forecasts
:Issued: 2009 Jun 30 2121 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
# http://www.swpc.noaa.gov/weekly.html
#
#                Weekly Highlights and Forecasts
#
Highlights of Solar and Geomagnetic Activity
22 - 28 June 2009

Solar activity was very low. New cycle polarity Region 1022 (S27,
L=045, class/area Bxo/020 on 21 June) was numbered on 21 June.
Region 1022 remained inactive and decayed to spotless plage early on
23 June. Region 1023 (S23, L=020, class/area Cso/040 on 24 June) was
numbered on 22 June. Region 1023 was most likely the source of
A-class x-ray activity occurring during this period. Region 1023
gradually decayed to spotless plage on 25 June.

No proton events were observed at geosynchronous orbit.

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

Geomagnetic field activity was at predominantly quiet levels during
22 - 23 June. Field activity increased to quiet to active conditions
late on 23 June and persisted through 24 June due to a coronal hole
high-speed stream (CH HSS). During this period, an isolated period
of minor storm levels was observed at high latitudes. Solar wind
densities at ACE began to rise at 22/2333Z, increasing from 1 p/cc
to a maximum of approximately 17 p/cc at 23/2045Z. ACE solar wind
observations showed a period of sustained southward IMF Bz between
23/1912Z and 24/2234Z (minimum of -20 nT / maximum of +20 nT). Solar
wind velocities increased from 247 km/s (at 24/0656Z) to a maximum
of 508 km/s (at 24/2112Z). Velocities gradually decreased to 366
km/s at 27/1034Z. Velocities increased again to 450 km/s at
28/2050Z. Bz reached a minimum of -12 nT at 28/1917Z, and the
density reached a maximum of 28 p/cc at 28/1603Z. Geomagnetic field
activity decreased to predominantly quiet conditions during 25 - 28
June. Isolated unsettled to active periods were observed late on 28
June due to a CH HSS.

Forecast of Solar and Geomagnetic Activity
01 - 27 July 2009

Solar activity is expected to be very low.

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is
expected to be at normal flux levels.

Geomagnetic field activity is expected to be at quiet levels, with
isolated unsettled conditions possible during 01 - 02 July due to
the continuing effects from the current CH HSS. Predominantly quiet
conditions are expected during 03 - 20 July. Quiet to unsettled
conditions, with isolated active periods at high latitudes, are
expected on 21 July due to a recurrent CH HSS. Predominantly quiet
conditions are expected during 22 - 24 July. Activity is expected to
increase to quiet to isolated unsettled levels on 25 July.
Predominantly quiet conditions are expected during 26-27 July.