IA. Analysis of Solar Active Regions and Activity from 16/2100Z to 17/2100Z: Solar activity decreased to very low levels. Region 956 (N02E21) was limited to the production of multiple B-class flares during the past 24 hours. The sunspot area and magnetic complexity underwent further enhancement today. Region analysis continues to depict a Dkc beta-gamma-delta sunspot group. Regions 955 (S09W92) and 957 (S04W47) were spotless over the past 24 hours.
No new regions were numbered today.

IB. Solar Activity Forecast: Solar activity is expected to be at low levels. There is a slight chance of an isolated M-class flare from Region 956.

IIA. Geophysical Activity Summary 16/2100Z to 17/2100Z:
The geomagnetic field was at predominantly quiet levels.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at predominantly quiet levels on 17 May.
Predominantly unsettled to active conditions with isolated minor storm periods are possible on 19 and 20 May, due to a recurrent coronal hole high speed stream.

III. Event Probabilities 18 May-20 May
Class M 25/25/25
Class X 05/05/05
Proton 01/01/05
PCAF Green
IV. Penticton 10.7 cm Flux
Observed 17 May 077
Predicted 18 May-20 May 075/075/075
90 Day Mean 17 May 074
V. Geomagnetic A Indices
Observed Afr/Ap 16 May 003/004
Estimated Afr/Ap 17 May 005/005
Predicted Afr/Ap 18 May-20 May 005/005-010/010-010/020 VI. Geomagnetic Activity Probabilities 18 May-20 May A. Middle Latitudes
Active 15/25/25
Minor storm 01/10/10
Major-severe storm 01/05/05
B. High Latitudes
Active 15/25/45
Minor storm 05/15/25
Major-severe storm 01/05/15
 

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NOAA Space Weather Scale descriptions can be found at www.sec.noaa.gov/NOAAscales