:Product: Weekly Highlights and Forecasts
:Issued: 2016 Jun 27 0346 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
20 - 26 June 2016

Solar activity was very low during the entire summary period with
only B-class flare activity observed. No Earth-directed CMEs
occurred.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit reached
high levels on 21-22 Jun and 25-26 Jun following coronal hole high
speed stream events. Normal to moderate levels were observed on the
remaining days.

Geomagnetic field activity was quiet on 20-21 Jun. Mostly quiet
conditions were observed early on 22 Jun but activity increased
after 22/1800 UTC due to enhanced solar wind parameters and
unsettled to minor storm levels were observed. Quiet to unsettled
conditions with isolated active periods were observed on 23-24 Jun
due to negative polarity CH HSS effects. Quiet to unsettled
conditions were observed on 25-26 Jun with an isolated period of
active conditions observed from 26/2100-2400 UTC due to CH HSS
effects.

Forecast of Solar and Geomagnetic Activity
27 June - 23 July 2016

Solar activity is expected to be very low throughout the forecast
period with a slight chance for C-class activity.

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 from 27 Jun to 01 Jul following CH HSS
effects. Normal to moderate levels are expected on 02-03 Jul as a
CIR redistributes electrons. High levels are expected to return from
04-07 Jul following a recurrent CH HSS. Moderate levels are expected
from 08-21 Jul followed by moderate to high levels on 22-23 Jul
following another recurrent CH HSS.

Geomagnetic field activity is expected to begin at unsettled to
active levels but decrease to mostly quiet levels by midday on 27
Jun and remain quiet through 29 Jun. Quiet to unsettled conditions
are expected from 30 Jun to 05 Jul with isolated active conditions
possible on 03 Jul due to a recurrent negative polarity CH HSS.
Quiet conditions are expected on 06 Jul. Quiet to unsettled
conditions are expected from 07-12 Jul with minor storms possible on
11 Jul and active periods likely on 12 Jul due to effects from a
recurrent positive polarity CH HSS. Mostly quiet conditions are
expected to return from 13-18 Jul with unsettled periods possible on
14-15 Jul. Quiet to unsettled conditions are expected on 19-21 Jul
due to negative polarity CH HSS effects with an isolated active
period likely on 19 Jul. Quiet conditions are expected for the
remainder of the period.