Summary and Forecast

Solar Summary

(last updated 19 Jul 2026 23:30 UT)

Activity 19 Jul: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 19 Jul: 119/71

Solar Forecast

(last updated 19 Jul 2026 23:30 UT)

20 Jul 21 Jul 22 Jul Activity R0 R0 R0 Fadeouts None expected None expected None expected 10.7cm/SSN 120/72 125/78 125/78 COMMENT: Solar flare activity on UT day 19-Jul was at the R0 level, with no significant flaring activity. There are currently three numbered regions visible on the solar disk and one unnumbered region. Active region (AR) 4492 (N15E68, beta) is the largest on the disk and appears stable. Region 4489 (S07W15, beta) has shown development in its trailer spots over the UT day. An unnumbered region recently appeared near N01E25 (beta) and is showing spot growth. All other regions are in decay. Solar flare activity is expected to be at the R0 level over 20-22 Jul. S0 solar radiation storm conditions were observed on UT day 19-Jul. S0 solar radiation storm conditions are expected over 20-22 Jul. No Earth-directed coronal mass ejections (CMEs) have been observed. The solar wind speed on UT day 19-Jul decreased, ranging from 335 to 280 km/s and is currently near 290 km/s. The peak total interplanetary magnetic field strength (IMF, Bt) was 5 nT and the north-south IMF component (Bz) range was -4 to +4 nT. A narrow, elongated trans-equatorial coronal hole spanning both solar hemispheres is currently nearing the central meridian, and is expected to influence the solar wind speed on 22-Jul. The solar wind speed is expected to remain at background levels over 20-21 Jul, then increase on 22-Jul due to coronal hole high speed wind stream effects from the aforementioned coronal hole feature.

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