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FXXX06 KWNP 180425

:Product: 7-day Space Weather Highlights
:Issued: 2015 May 18 0402 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
#                7-day Space Weather Highlights
Highlights of Solar and Geomagnetic Activity
11 - 17 May 2015

Solar activity was low from 11-15 May. The largest event of the
period was a C9/1n at 13/1838 UTC associated with a filament
eruption near Region 2345 (N16, L=113, class/area Axx/020 on 13
May). Region 2339 (N13, L=129, class/area Fkc/900 on 08 May) was the
most active region on the disk and produced 19 C-class events during
the period. There were several filament eruptions observed during
the period however, none of them turned out to be geoeffective.
Solar activity decreased to very low levels for 16-17 May.

The greater than 10 MeV proton flux at geosynchronous orbit was
enhanced on 12 May reaching a peak flux of 6 pfu at 12/0720 UTC but
never crossed alert threshold.

The greater than 2 MeV electron flux at geosynchronous orbit was at
normal to moderate levels on 11-13 May before reaching high levels
daily for the remainder of the period in response to effects from a
negative polarity coronal hole high speed stream (CH HSS).

Geomagnetic field activity was at unsettled to active levels on 11
May and mostly unsettled levels on 12 May due to extended periods of
negative Bz. On 13 May, geomagnetic field conditions increased to
active to major storm levels due to the onset of a recurrent
negative polarity CH HSS. Quiet to unsettled levels persisted on
14-15 May as effects from the HSS subsided. Quiet conditions
prevailed for the remainder of the period. is the U.S. government's official web portal to all federal, state and local government web resources and services.