Summary and Forecast

Solar Summary

(last updated 19 Sep 2020 23:31 UT)

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

Solar Forecast

(last updated 19 Sep 2020 23:31 UT)

20 Sep 21 Sep 22 Sep Activity Very low Very low Very low Fadeouts None expected None expected None expected 10.7cm/SSN 70/5 70/5 70/5 COMMENT: Solar activity was Very Low on UT day 19 September. The Sun is currently spotless with no numbered regions on the visible disc. No returning regions are expected. No earthward directed CMEs were visible in the available coronagraph images. Very Low levels of solar activity are expected for the next three UT days, 20-22 September. On UT day 19 September, the solar wind speed varied between 310-330 km/s in the first half of the day, then decreased to a minimum of 274 km/s, currently around 290 km/s. The total IMF (Bt) varied between 1-4 nT, and the north-south component of IMF (Bz) was in the range +2/-3 nT. For the next three UT days, 20-22 September, the solar wind parameters are expected to be mostly near background levels but may become weakly enhanced at times due to a few small and weak equatorial coronal holes.

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