Routine Space Environment Product Issued Weekly
Issued by NWS
FXXX06 KWNP 271725
:Product: 7-day Space Weather Highlights
:Issued: 2015 Jul 27 1656 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
20 - 26 July 2015
Solar activity reached low levels this period. Region 2389 (S11,
L=164, class/area=Dai/80 on 25 Jul) produced three low-level C-class
flares throughout the period which were the largest observed events.
Region 2389 produced a C1 flare at 24/0315 UTC, a C2/Sf flare at
24/1444 UTC, and a C1 flare at 26/1234 UTC but none of these events
resulted in coronal mass ejections (CMEs) that were Earth-directed.
Region 2390 (S15, L=198, class/area=Dac/130 on 26 Jul) underwent
moderate penumbral development and increased in magnetic complexity
late in the period, but remained largely unproductive. No
Earth-directed CMEs were detected in SOHO/LASCO coronagraph imagery
throughout the period.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit reached
high levels on 20, 26 Jul with moderate levels observed on 21-22,
and 24-25 Jul. The electron flux decreased to normal levels on 23
Jul in response to enhanced geomagnetic field activity attributed to
a combination of CME and coronal hole high speed stream (CH HSS)
Geomagnetic field activity reached active to G1 (Minor) geomagnetic
storm levels on 23 Jul due to a combination of the arrival of the 19
Jul CME (filament eruption) and the onset of a weak positive
polarity CH HSS. Active conditions were observed at 23/0300-0600 UTC
and 23/1800-2100 UTC and G1 storm conditions were observed at
23/0600-0900 UTC. The geomagnetic field was at quiet or quiet to
unsettled levels for the remainder of the period under an ambient
solar wind environment followed by weak CH HSS influence.