Summary and Forecast

Solar Summary

(last updated 19 Apr 2018 23:31 UT)

Activity 19 Apr: Very low Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 19 Apr: 71/6

Solar Forecast

(last updated 19 Apr 2018 23:31 UT)

20 Apr 21 Apr 22 Apr Activity Very low Very low Very low Fadeouts None expected None expected None expected 10.7cm/SSN 72/8 72/8 72/8 COMMENT: Solar activity was at Very Low levels on UT day 19 April. Very Low levels of solar flare activity are expected for the next three UT days, 20-22 April, with a remote chance of C-class flares. No Earth-directed CMEs were observed in the available imagery during the last 24 hours. On UT day 19 April the solar wind speed was mainly below 300 km/s. The IMF Bt was less than 4 nT, mainly around 2 nT, and the Bz component of IMF was between +/-2 nT. Solar winds are expected to become enhanced on 20 April due to the influence of a recurrent negative-polarity equatorial coronal hole. The enhanced winds are expected to continue on 21 April then start to wane on 22 April.

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