Solar
FORECAST SOL: Moderate yellow MAG: Normal green ION: Normal green
HomeSolarSolar ConditionsSummary and Forecast Monday, May 27 2024 21:09 UT
Solar Conditions

Summary and Forecast

Solar Summary

(last updated 26 May 2024 23:30 UT)

Activity 26 May: R0 Flares: none. Observed 10.7 cm flux/Equivalent Sunspot Number for 26 May: 156/110

Solar Forecast

(last updated 26 May 2024 23:30 UT)

27 May 28 May 29 May Activity R1,chance R2 R1,chance R2 R1,chance R2 Fadeouts Possible Possible Possible 10.7cm/SSN 155/109 155/109 155/109 COMMENT: Solar activity on UT day 26-May was at R0. Solar region AR3691(N25E56, beta-gamma) has shown growth in its northern leader spots and some spot redistribution but has now lost its small delta spot. This region has produced several C class flares in the past 24 hours, the largest a C7.4 at 26/1706UT. Small solar region AR3690(N17E40, beta-gamma) has developed very small trailer spots of mixed magnetic polarity. Solar region AR3685(S14W59, beta), a mostly stable bipolar region has shown a mix of growth and decay of its small surrounding spots and smaller nearby AR3686(S08W48, beta) trailer spots are now in decay. Small solar region AR3692(S10E08, beta) has continued to grow. There are currently 6 numbered solar regions and three small unnumbered regions at N27E66, N08E74 and N08E71. All other sunspot regions are either stable or in decay. Solar activity is expected to be at the R1 level over 27-29 May, with a chance of R2. A large previously flare active solar region (designated AR3664 on its previous disk transit) appears to be returning and is just behind the southeast solar limb, though the background GOES X-ray flux has yet to show an upward trend. This regions evolution during its far side transit is largely unknown and will become evident after the region rotates onto the visible solar disk. No Earth directed CMEs have been observed. A narrow southwest directed CME was observed in LASCO C2 coronagraph imagery at 26/2112UT appears associated with activity on the southwest solar limb. The solar wind speed on UT day 26-May was slightly variable, ranging from 340 to 460 km/s and is currently near 349 km/s. The peak total interplanetary field strength (IMF, Bt) was 7 nT and the north-south IMF component (Bz) range was +6 to -6 nT. The solar wind speed may mildly increase over 27-28 May due to several mild coronal hole wind stream influences.

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

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