Summary and Forecast

Solar Summary

(last updated 17 Oct 2021 23:31 UT)

Activity 17 Oct: Very low Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 17 Oct: 77/16

Solar Forecast

(last updated 17 Oct 2021 23:31 UT)

18 Oct 19 Oct 20 Oct Activity Very low Very low Very low Fadeouts None expected None expected None expected 10.7cm/SSN 78/17 80/20 80/20 COMMENT: Solar activity was very low on UT day 17 October. The solar disk is currently spotless. Very low solar activity is expected for the next three UT days 18-20 October. SDO images observed a filament eruption in the NW quadrant(N35W15) around 17/0719UT. A very weak(faint) CME observed in STEREO imagery starting 17/0936UT. This CME is very difficult to model but may have a weak Earth directed component. No other CMEs other were observed in the available coronagraph imagery. On UT day 17 October, the the solar wind speed was slightly enhanced varying between 340 Km/s and 420 km/s. The total IMF (BT) range was 6 to 10 nT and the north-south IMF (Bz) component range was +9/-8 nT with a sustained southward orientation since 17/0820UT. Solar wind parameters are expected to become disturbed from late 18 October with the arrival of high speed stream from two coronal holes in the northern and southern hemispheres.

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