:Product: Weekly Highlights and Forecasts
:Issued: 2016 Apr 25 0446 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
18 - 24 April 2016

Solar activity was high on 18 Apr due to an M6/1f flare observed at
18/0029 UTC from old Region 2529 (N09, L=342, class/area Eki/850 on
11 Apr). Type II (1869 km/s) and Type IV radio sweeps were observed
in conjunction with this event, as well as a 120 sfu Tenflare.
Activity dropped to low levels on 19 Apr with a C1/Sf observed at
19/2302 UTC. Very low levels were observed for the remainder of the
period after the region departed the disk.

No proton events were observed at geosynchronous orbit.

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

Geomagnetic field activity was mostly quiet on 18-21 Apr. Quiet to
unsettled conditions were observed on 22-24 Apr. Isolated active
periods were observed on 22 and 24 Apr along with an isolated minor
storm period on 23 Apr due to CH HSS effects.

Forecast of Solar and Geomagnetic Activity
25 April - 21 May 2016

Solar activity is expected to be very low to low for the majority of
the period with a chance for M-class flares from 03-16 May due to
the return of old Region 2529.

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 the exception of
01-03 May and 10-13 May following recurrent CH HSS events.

Geomagnetic field activity is expected to be quiet to unsettled on
25-26 Apr as CH HSS effects subside followed by quiet conditions on
27-28 Apr. Quiet to unsettled conditions are expected on 29 Apr to
01 May with active periods likely due to effects from a recurrent,
negative polarity CH HSS. An isolated minor storm period is possible
on 30 Apr. Mostly quiet conditions are expected on 02-08 May with
unsettled to active periods possible on 04 May due to a SSBC. Quiet
to active levels are expected on 09-11 May with minor storm periods
likely due to negative polarity CH HSS effects. Mostly quiet
conditions are expected from 12-18 May. Isolated unsettled to active
periods are possible on 14 May due to another SSBC. Quiet to
unsettled conditions are expected from 19-21 May with isolated
active periods possible due to effects from a recurrent, positive
polarity CH HSS.