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Here is this week's space weather and geophysical report, issued 2015 May 25 0854 UTC.
Highlights of Solar and Geomagnetic Activity
18 - 24 May 2015
Solar activity was at low levels from 18-23 May with very low levels
observed on 24 May. Only low level isolated C-class flaring was
observed during the period originating from Regions 2349 (S21,
L=002, class/area Dao/060 on 24 May), 2351 (N22, L=330, class/area
Cso/020 on 20 May), and 2353 (N07, L=344, class/area Dao/060 on 24
May). Region 2339 (N13, L=129, class/area Fkc/900 on 08 May), which
was very productive last period, decayed as it quietly rotated
around the NW limb on 18 May. Region 2349 emerged on the visible
disk on 18 May, but did not show any significant growth until 23
May. Region 2353 emerged on 21 May and exhibited growth through the
end of the period. However, both regions only managed 60 millionths
of coverage by the end of the period. No Earth directed coronal mass
ejections were observed.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit was at
normal levels on 19 and 24 May, moderate levels from 20-23 May, and
at high levels on 18 May.
Geomagnetic field activity ranged from quiet to major storm
conditions. The period began under the influence of a co-rotating
interaction region followed by a positive polarity equatorial
coronal hole high speed stream (CH HSS). Total field increased to a
maximum of 18 nT at 19/0052 UTC while the Bz component fluctuated
between +13 nT and -15 nT late on 18 May through early on 19 May.
Solar wind increased to near 575 km/s by midday on 19 May before
slowly returning to nominal conditions by late on 20 May. The
geomagnetic field responded with minor to major storm conditions
late on 18 May through early on 19 May. Quiet to unsettled levels
were observed on 20 May. A return to quiet conditions occurred on 21
May and persisted through the end of the period.
Forecast of Solar and Geomagnetic Activity
25 May - 20 June 2015
Solar activity is expected to be at very low to low levels. A chance
for moderate levels exists from 30 May through 11 Jun with the
return of Region 2339.
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 high levels
possible from 31 May-01 Jun, 04-06 Jun, 10-12 Jun, and 16-20 Jun due
to recurrent CH HSS effects.
Geomagnetic field activity is expected to be at unsettled to active
levels from 28-30 May, 02-03 Jun, 07-11 Jun, and 13-15 Jun with
possible minor storm levels on 08-09 Jun due to recurrent CH HSS
effects.
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![Weekly Propagation Summary - 2015 May 25 16:10 UTC]()
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