| --- |
| Solar Activity |
| --- |
| .24 hr Summary... |
| Solar activity was at high levels. Region 3638 (S17W74, Cai/beta) |
| produced the strongest flare of the period, an M2.0 flare (R1-Minor) at |
| 24/2259 UTC. AR 3638 also produced a C9.4 flare at 24/1410 that had |
| associated Type IV and Type II radio sweeps (est. 800 km/s initially |
| reported, but revised down to 379 km/s in the final report) as well as a |
| faint CME off the SW in C2 coronagraph imagery beginning at 24/1436 UTC. |
| Analysis and modeling of the event determined the CME to be ahead and |
| south of Earths orbit. |
| Newly numbered Region 3658 (S21W32, Box/beta) was relatively quiet. |
| Growth was observed in Region 3648 (N18W38, Dai/beta-gamma) and 3654 |
| (S08E25, Eac/beta). The remaining 14 spotted active regions on the |
| visible disk were either mostly stable or in gradual decay. |
| |
| --- |
| .Forecast... |
| Solar activity is expected to be at moderate over the next three days, |
| with M-class flares (R1-R2/Minor-Moderate) expected, and a slight chance |
| for an X-class flare (R3/Strong). |
| --- |
| Energetic Particle |
| --- |
| .24 hr Summary... |
| The greater than 2 MeV electron flux was peaked near high levels but |
| remained moderate, and the greater than 10 MeV proton flux was at |
| background levels. |
| --- |
| .Forecast... |
| There is a slight chance for the greater than 10 MeV proton flux to |
| reach S1 (Minor) levels over 24-26 Apr due to the flare potential and |
| location of several active regions on the visible disk. The greater than |
| 2 MeV electron flux is forecast to continue at normal to moderate levels |
| throughout the forecast period. |
| --- |
| Solar Wind |
| --- |
| .24 hr Summary... |
| Solar wind conditions reflected nominal conditions. Total magnetic field |
| strength was at or below 5 nT. Solar wind speeds were mostly between |
| ~350-400 km/s. Phi angle transitioned from negative to positive between |
| 24/0615-1530 UTC. |
| --- |
| .Forecast... |
| Enhanced solar wind conditions are expected over 25-27 Apr due to CH HSS |
| influences and possibly multiple transients that are suspected to pass |
| by in the vicinity of Earth over the next few days. |
| --- |
| Geospace |
| --- |
| .24 hr Summary... |
| The geomagnetic field was quiet. |
| --- |
| .Forecast... |
| Geomagnetic field activity is likely to range from quiet to active |
| levels on 25-27 Apr due to the anticipated influence of CH HSS activity |
| combined with potential transient influence from the edge of pass CMEs |
| in the vicinity of Earth. A chance for minor (G1) or greater geomagnetic |
| storms exists over 25-26 Apr should these features carry periods of |
| significant southward Bz. |
