This is the HELIO4CAST interplanetary coronal mass ejection (ICME) catalog (ICMECAT), based on in situ magnetic field and bulk plasma observations in the heliosphere.

icmecat_id: The unique identifier for the observed ICME. unit: string.

sc insitu: The name of the in situ observing spacecraft. unit: string.

icme_start_time: Shock arrival or density enhancement time, can be similar to mo_start_time. unit: UTC.

mo_start_time: Start time of the magnetic obstacle (MO), including flux ropes, flux-rope-like, and ejecta signatures. unit: UTC.

mo_end_time: End time of the magnetic obstacle. unit: UTC.

mo_sc_heliodistance: Heliocentric distance of the spacecraft at mo_start_time. unit: AU.

mo_sc_long_heeq: Heliospheric longitude of the spacecraft at mo_start_time, range [-180,180]. unit: degree (HEEQ).

mo_sc_lat_heeq: Heliospheric latitude of the spacecraft at mo_start_time, range [-90,90]. unit: degree (HEEQ).

icme_duration: Duration of the interval between icme_start_time and mo_endtime. unit: hours.

icme_bmax: Maximum total magnetic field in the full icme interval (icme_start_time to mo_end_time). unit: nT.

icme_bmean: Mean total magnetic field during the full icme interval (icme_start_time to mo_end_time). unit: nT.

icme_bstd: Standard deviation of the total magnetic field from icme_start_time to mo_end_time. unit: nT.

12: icme_speed_mean: Mean proton speed from icme_start_time to mo_end_time. unit: km/s.

icme_speed_std: Standard deviation of proton speed from icme_start_time to mo_end_time. unit: km/s.

mo_duration: Duration of the interval between mo_start_time and mo_endtime. unit: hours.

mo_bmax: Maximum total magnetic field in the magnetic obstacle interval (mo_start_time to mo_end_time). unit: nT.

mo_bmean: Mean total magnetic field in the magnetic obstacle. unit: nT.

mo_bstd: Standard deviation of the total magnetic field in the magnetic obstacle. unit: nT.

mo_bzmean: Mean magnetic field Bz component in the magnetic obstacle. unit: nT.

mo_bzmin: Minimum magnetic field Bz component in the magnetic obstacle. unit: nT.

mo_bzstd: Standard deviation of the magnetic field Bz component in the magnetic obstacle. unit: nT.

mo_bymean: Mean magnetic field By component in the magnetic obstacle. unit: nT.

: mo_bystd: Standard deviation of the magnetic field By component in the magnetic obstacle. unit: nT.

mo_speed_mean: Mean proton speed from mo_start_time to mo_end_time. unit: km/s.

mo_speed_std: Standard deviation of proton speed from mo_start_time to mo_end_time. unit: km/s.

mo_expansion_speed: Difference between proton speed at mo_start_time to proton speed at mo_end_time. unit: km/s.

mo_pdyn_mean: Mean proton dynamic pressure from mo_start_time to mo_start_time. unit: nPa.

mo_pdyn_std: Standard deviation of proton dynamic pressure from mo_start_time to mo_start_time. unit: nPa.

mo_density_mean: Mean proton density from mo_start_time to mo_start_time. unit: cm^-3.

mo_density_std: Standard deviation of proton density from mo_start_time to mo_start_time. unit: cm^-3

mo_temperature_mean: Mean proton temperature from mo_start_time to mo_start_time. unit: K.

mo_temperature_std: Standard deviation of proton temperature from mo_start_time to mo_end_time. unit: K.

sheath_speed_mean: Mean proton speed from icme_start_time to mo_start_time, NaN if these times are similar. unit: km/s.

sheath_speed_std: Standard deviation of proton speed from icme_start_time to mo_start_time, NaN if these times are similar. unit: km/s.

sheath_density_mean: Mean proton density from icme_start_time to mo_start_time, NaN if these times are similar. unit: cm^-3.

sheath_density_std: Standard deviation of proton density from icme_start_time to mo_start_time, NaN if these times are similar. unit: cm^-3.

sheath_pdyn_mean: Mean proton dynamic pressure, from icme_start_time to mo_start_time, NaN if these times are similar. unit: nPa.

sheath_pdyn_std: Standard deviation of proton dynamic pressure, from icme_start_time to mo_start_time, NaN if these times are similar. unit: nPa.