Solar flaring activity over the last 24 hours has been moderate, with one M-class flare and a few C-class flares. The strongest flare was an M3.2 flare peaking at 08:21 UTC on May 19, from beyond the east limb. There are currently five numbered active regions on the solar disk. The most complex one is SIDC Sunspot Group 496 (NOAA Active Region 4087, magnetic type beta-delta). SIDC Sunspot Group 491 has rotated on disk from the east limb, in the southeast quadrant. The solar flaring activity is expected to be low over the next 24 hours, with C-class flares expected and a small chance for M-class flares.
A wide Coronal Mass Ejection (CME), SIDC CME 500, was observed in LASCO/C2 and LASCO/C3 coronagraph imagery starting from 00:24 UTC on May 19, lifting off the northwest quadrant. The CME is most likely associated with a long filament eruption observed in SDO/AIA 304 data around 21:48 UTC on May 18 near the central meridian, in mid-latitude northern hemisphere. A possible glancing blow may arrive at Earth starting from the UTC evening of May 22. No other Earth-directed CMEs were observed in the available coronagraph imagery.
The elongated, mid-latitude, positive polarity coronal hole (SIDC Coronal Hole 104) continues to cross the central meridian since May
15.
The greater than 10 MeV proton flux was below the 10 pfu threshold over the past 24 hours. It is expected to remain below the threshold level over the next 24 hours.
The greater than 2 MeV electron flux measured by GOES 18 was over the 1000 pfu threshold between 16:20 UTC on May 18 and 00:15 UTC on May 19. The greater than 2 MeV electron flux measured by GOES 19 was mostly below the 1000 pfu threshold over the past 24 hours. The greater than 2 MeV electron flux is expected to be above the 1000 pfu threshold over the next 24 hours. The 24-hour electron fluence is presently at normal levels but is expected to gradually increase over the next 24 hours.