Summary and Forecast

Solar Summary

(last updated 23 Jul 2021 23:40 UT)

Activity 23 Jul: Very low Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 23 Jul: 87/30

Solar Forecast

(last updated 23 Jul 2021 23:40 UT)

24 Jul 25 Jul 26 Jul Activity Very low to low Very low to low Very low to low Fadeouts None expected None expected None expected 10.7cm/SSN 87/30 85/27 85/27 COMMENT: Solar activity was very low on UT day 23 July. There are six numbered regions on the visible disc: AR2844 to AR2849, with AR2845 rotating over the west limb on 24 July. No Earth directed CMEs were observed in the available images on 23 July. Solar activity is expected to be very low to low for the next three UT days, 24-26 July, with a low chance of M-class flares. On 23 July, the solar wind speed peaked at 431 km/s, the IMF (Bt) peaked at 5 nT and the north-south IMF component (Bz) range was +/-4 nT. The solar wind speed is expected to be near background levels to slightly enhanced for the next three UT days, 24-26 July. There remains a chance that the CME first observed at 20/1648 UT could impact Earth, elevating the solar wind speed to moderately enhanced levels on 24 July.

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