Routine Space Environment Product Issued Weekly
Issued by NWS
FXXX06 KWNP 260826
:Product: 7-day Space Weather Highlights
:Issued: 2015 Jan 26 0809 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
19 - 25 January 2015
Solar activity briefly reached moderate levels (R1, minor, on the
NOAA Scales) when Region 2268 (S10, L=048, class/area=Ekc/BG on 24
January) produced an M1 flare on 22 January at 0452 UTC as it
rotated onto the visible disk. The remainder of the week was
dominated by low levels of solar activity, with Region 2268
responsible for about two thirds of the C-class events and the rest
distributed among five other regions. No Earth-directed coronal mass
ejections were noted.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit was at
normal to moderate levels. Moderate levels were reached on 21
January and from 23-25 January.
The geomagnetic field activity ranged from quiet to active levels
during the week. Active levels were observed on 21-22 January in
response to a southern hemisphere, negative polarity, coronal hole
high speed solar wind stream. Observations at the ACE spacecraft
indicated a sector boundary change from positive to negative
orientation beginning around 1730 UTC on 20 January. This was
followed by a corotating interaction region signature including a
jump in density and a significant increase in the Bt component from
5 nT to a peak near 20 nT. Bz was initially mostly positive, but
reached a minimum of -15 nT by 1550 UTC on 21 January. Wind speed at
ace was initially near 300 km/s early on 21 January and increased
over the next 12 hours to over 500 km/s. The enhanced magnetic field
gradually relaxed, returning to a Bt near 5 nT by midday on 22 Jan.
Then, solar wind speed gradually decreased, ending the week near 300
km/s. The geomagnetic field remained unsettled through the first
three synoptic periods of 23 January before returning to mostly
quiet levels where it remained for the rest of the week.