:Product: Weekly Highlights and Forecasts
:Issued: 2017 Jun 12 0422 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
05 - 11 June 2017

Solar activity was at very low levels on 06, 08-11 June. Low levels
were reached on 05 and 07 June due to flare activity from Region
2661 (N06, L=211, class/area Dao/200 on 02 June). The largest flare
of the period was a C2/Sf at 05/0531 UTC. No Earth-directed CMEs
were observed in available satellite imagery.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at
normal to moderate levels.

Geomagnetic field activity ranged from quiet to G1 (Minor) storm
levels. Quiet to unsettled conditions were observed during the first
six days of the reporting period (05-10 June) under a nominal solar
wind regime. During this timeframe, solar wind speeds decreased from
approximately 400 km/s to near 275 km/s. Total field values (Bt)
ranged between 1 and 7 nT while the Bz did not drop lower than -5
nT. Phi angle was variable. At approximately 11/1330 UTC a solar
wind enhancement occured, indicated by an increase in wind speed to
near 430 km/s, an enhanced total field of 14 nT, and a low Bz value
of -12 nT. Phi angle remained in a positive orientation shortly
after the enhancement indicating a SSBC and the arrival of a
recurrent, positive-polarity CH HSS. The geomagnetic field responded
to this enhancement with unsettled to active levels and an isolated
period of G1 (Minor) storm conditions.

Forecast of Solar and Geomagnetic Activity
12 June - 08 July 2017

Solar activity is expected to be at very low to low levels
throughout 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 normal to moderate levels with high levels likely
on 16-26 June due to recurrent CH HSS influence.

Geomagnetic field activity is expected to be mostly quiet with
unsettled to active levels expected on 12-19 June and G1 (Minor)
geomagnetic storm levels likely on 16 June due to recurrent CH HSS
effects.