:Product: Weekly Highlights and Forecasts
:Issued: 2016 Jun 13 0444 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
06 - 12 June 2016

Solar activity was at very low levels from 06-08 June and again on
10 June. Low levels were reached on 09 June and again from 11-12
June due to C-class flare activity from Region 2552 (N15, L=359,
class/area Dao/150 on 11 June). The largest flare of the period was
a C6 at 11/2228 UTC. Region 2552 grew rapidly since its emergence on
07 June to a compact beta-delta magnetic class, but appeared to be
in decay by 11 Jun as it neared the NW limb. No Earth-directed
coronal mass ejections were observed during the period.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at
moderate levels on 06 June and again from 11-12 June. High levels
were reached from 07-10 June with a peak flux of 1,590 pfu observed
at 10/1520 UTC.

Geomagnetic field activity ranged from quiet to G2-Moderate
geomagnetic storm levels during the period. The period began with
solar wind speeds near 650 km/s and total field values near 7 nT
while the Bz component fluctuated between +/- 6 nT under the slowly
waning influence of a negative polarity coronal hole high speed
stream (CH HSS). As a result, mostly active levels and an isolated
G2-Moderate storm period were observed during the first half of the
UTC day on 06 June. Solar wind speeds continued to decrease to
nominal levels by 10 June. Quiet to unsettled conditions were
observed on 07 June with quiet conditions on 08-09 June. By midday
on 10 June, a solar sector boundary crossing was observed into a
positive (away) sector followed by an increase in total field to 14
nT by late on 10 June. A lesser rise in solar wind speed to near 540
km/s was observed as a positive polarity CH HSS moved into a
geoeffective position. Solar wind speeds continued to be elevated in
the 450 km/s to 550 km/s range for the rest of the period with total
field ranging between 7-10 nT. The geomagnetic field responded with
quiet to active periods on 10-11 June and quiet to unsettled levels
on 12 June.

Forecast of Solar and Geomagnetic Activity
13 June - 09 July 2016

Solar activity is expected to be at very low to low levels for the
forecast period.

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is
expected to be at high levels on 17-18 June, 26 June-01 July and
04-07 July in response to CH HSS activity.

The geomagnetic field is expected to be at unsettled to active
levels on 13, 15-17, 22-24, 26-27 June and from 02-03, 07-09 July
with G1-Minor storming likely on 02-03 July due to recurrent CH HSS
activity.