Solar
FORECAST SOL: Normal green MAG: Normal green ION: Normal green
HomeSolarSolar ConditionsSummary and Forecast Sunday, Sep 22 2019 18:10 UT
Solar Conditions

Summary and Forecast

Solar Summary

(last updated 21 Sep 2019 23:34 UT)

Activity 21 Sep: Very low Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 21 Sep: 68/2

Solar Forecast

(last updated 21 Sep 2019 23:34 UT)

22 Sep 23 Sep 24 Sep Activity Very low Very low Very low Fadeouts None expected None expected None expected 10.7cm/SSN 68/2 68/2 68/2 COMMENT: Solar activity remained very low on UT day 21 September with no active regions on the visible disc. No active regions are expected to rotate onto the visible disc and very low solar activity is expected for the next three UT days, 22-24 September. During UT day 21 September, the solar wind speed showed a quick rise from 300 km/s to 364 km/s between 03.56 and 06.21 UT and then stayed between 340 km/s and 360 km/s during the rest of the day. The total IMF (Bt) increased from 3 nT to 7 nT by 06.03 UT and then varied between 2 and 6 nT during the remaining day, Bz turned south to -6.2 around 05.47 UT and the particle density increased from 4 to 12 ppcc around 06.00 UT. These observations seem to support the arrival of a slow and weak CME that was observed on 16 September. Solar wind stream is expected to stay at nominal levels on UT day 22 September and then show some strengthening on UT days 23 and 24 September due to the effect of a coronal hole.

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

go to top of page