A shock was detected in the solar wind ACE data around 11:34 UTC on April 30. The interplanetary magnetic field increased from 3 nT to 6 nT and the solar wind speed jumped from 380 km/s to 420 km/s. The solar wind density at the shock increased from 4/cm3 to 10/cm3, and the temperature jumped from about 1.4e4 K to 1.02e5 K. The shock is possibly related to an ICME arrival related to a faint slow CME detected in LASCO/C2 data around 11:00 UTC on April 27. Geomagnetic conditions are expected to be disturbed with unsettled to active conditions possible depending on the Bz.

A class M9.5 solar X-ray flare occurred on 2024/04/30 with peak time 23:46UT

A halo or partial-halo CME was detected with the following characteristics: t0 | dt0| pa | da | v | dv | minv| maxv| 2024-05-01T06:36:09.642 | 2.0 | 241 | 160 | 577 | 82 | 394 | 760 t0: onset time, earliest indication of liftoff dt0: duration of liftoff (hours) pa: principal angle, counterclockwise from North (degrees) da: angular width of the CME (degrees), v: median velocity (km/s) dv: variation (1 sigma) of velocity over the width of the CME mindv: lowest velocity detected within the CME maxdv: highest velocity detected within the CME

Solar flaring activity over the past 24 hours was at moderate levels. The largest flare was a M1.9-flare, with peak time 14:40 UTC on May 01 associated with NOAA AR 3654 (beta-gamma-delta). There are currently 6 numbered active regions on the visible disk. NOAA AR 3654 (beta-gamma-delta) is the largest and is rotating over the west limb. NOAA AR 3663 (beta-gamma-delta) is the second largest and is responsible for most of the flaring activity in the last 24 hours. NOAA AR 3664 (beta-gamma) has rotated over the east limb and produced some minor C-class flaring. All other regions were inactive and stable. The solar flaring activity is likely to be at moderate levels over the coming days with C-class flares expected and M-class flares possible. No Earth-directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraph images. Further analysis of the CME seen in LASCO C2 data at 06:36 UTC on May 01, shows a possible glancing blow late on May 04. A small positive polarity low-latitude coronal hole is crossing the central meridian. A high-speed stream from this coronal hole may impact the Earth on May 04. Over the past 24 hours the greater than 10 MeV GOES proton flux was at background levels and is expected to remain so over the next days. The greater than 2 MeV electron flux measured by GOES 16 and GOES 18 was below the 1000 pfu threshold and is expected to remain so in the upcoming days. The 24h electron fluence was at nominal level and is expected to remain so in the next days.

Geomagnetic conditions were globally and locally quiet to unsettled (Kp 3 and K Bel 3). Quiet to unsettled conditions are expected in the next 24 hours. Slow solar wind conditions were recorded over the past 24 hours. The interplanetary magnetic field varied between 3 nT and 13 nT, with the Bz reaching a minimum value of -12 nT. The solar wind velocity varied in the range of 324 to 407 km/s. The phi-angle was mainly in the positive sector (directed away from the Sun) with periods in the negative sector. Slow solar wind conditions are expected in the next 24 hours.