Summary and Forecast

Solar Summary

(last updated 23 May 2017 23:32 UT)

Activity 23 May: Very low Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 23 May: 76/14

Solar Forecast

(last updated 23 May 2017 23:32 UT)

24 May 25 May 26 May Activity Very low to low Very low to low Very low to low Fadeouts None expected None expected None expected 10.7cm/SSN 75/13 75/13 75/13 COMMENT: Solar activity was Very Low for the UT day, 23 May. Expect Very Low to Low solar activity for the next three days. LASCO C2 imagery shows a partial halo CME first observed on 23/0536UT image, possibly associated with disappearing solar filament reported by Learmonth and San Vito Solar Observatories. CME is likely to hit Earth on 26 May, pending further analysis. The solar wind speed decreased from 575 to near 500 km/s over the last 24 hours. Expect the solar wind speed to gradually return to nominal levels over the UT day as the effect of the negative polarity coronal hole rotates out of geoeffective range. The north-south component of IMF (Bz) fluctuated between +2/-4nT, predominately negative, over the last 24 hours and B total was approximately 4 nT. On 26 May expect the solar wind to return to elevated levels due to CME effects.

Solar Activity levels are explained in the SWS Solar Terrestrial Glossary.