SPEARHEAD SolO/HET catalogue

The SPEARHEAD SolO/HET catalogue includes:

• 174 electron (E>1 MeV)
• 13 electron (E=[5.9930 - 18.8300] MeV)
• 149 proton (E~8 MeV)
• 76 proton (E~25 MeV)
• 49 proton (E~50 MeV)

Solar Energetic Particle (SEP) events. A detailed description of the catalogue's contents - divided semantically into sections - follows:

Section 1: Event identification

• Column 1 (Catalogue entry number): Sequential identifier of the event within the catalogue.

• Column 2 (Event identifier): Unique event identifier following the catalogue naming convention.

Section 2: Particles

Particle measurements are provided for two electron energy channels (>1 MeV and [5.993–18.83] MeV) and three proton energy channels (~8, ~25, and ~50 MeV). For each energy channel, the same set of parameters is reported, describing the onset, peak intensity, and fluence of the SEP event.

For all particle channels, the following column structure is used:

• Onset Time [UT]: Estimated onset time of the particle increase, calculated using the sigma method with a threshold of 2 sigma.

• Onset Resolution [min]: Temporal resolution of the data used for onset determination.

• Onset Viewing: Viewing sector used for the onset determination.

• Onset Error [min]: Estimated uncertainty of the onset time determination, calculated by subtracting the earlier found onset from the latest found onset out of various combinations of data temporal resolutions and viewing sectors.

• Peak Time [UT]: Time of maximum measured particle intensity.

• Peak Intensity [1/(cm² sr s MeV)]: Maximum differential particle intensity measured during the event.

• Peak Resolution [min]: Temporal resolution of the data used for determining the peak intensity.

• Peak Viewing: Viewing sector used for the peak intensity determination.

• Fluence [1/(cm² sr MeV)]: Event-integrated particle fluence over the selected integration interval.

• Fluence Start Time [UT]: Start time of the fluence integration interval.

• Fluence End Time [UT]: End time of the fluence integration interval.

• Fluence Resolution [min]: Temporal resolution used in the fluence calculation.

• Fluence Viewing: Viewing sector used for the fluence calculation.

Section 2.1: HET / Electrons

• Columns 3–15: Electron measurements at E>1 MeV.

• Columns 16–28: Electron measurements at E=[5.993–18.83] MeV.

Section 2.2: HET / Protons

• Columns 29–41: Proton measurements at E~8 MeV.

• Columns 42–54: Proton measurements at E~25 MeV.

• Columns 55–67: Proton measurements at E~50 MeV.

Section 2.3: Abundances SIS

For the abundance indicators (3He-rich and Fe-rich), the following values are used:

• Y: Event identified as enriched in the corresponding element.

• N: No elemental enrichment identified.

• Y?: Possible enrichment, but classification remains uncertain.

• N?: No clear enrichment detected, although the classification remains uncertain.

• BG: No significant particle increase above background levels was detected for the corresponding element.

• Column 68 (3He-rich): Indicator identifying events with enhanced 3He abundance.

• Column 69 (Fe-rich): Indicator identifying events with enhanced Fe abundance.

Section 3: Context data

Section 3.1: Flare

The flare subsection contains information about the associated solar flare.

• Column 70 (Start time [UT]): Start time of the associated flare.

• Column 71 (Source): Solar source region associated with the flare event.

• Column 72 (Longitude [deg.]): Heliographic longitude of the flare source region.

• Column 73 (Latitude [deg.]): Heliographic latitude of the flare source region.

• Column 74 (Measured GOES Class): GOES soft X-ray flare class directly measured by observations.

• Column 75 (Estimated GOES Class): Estimated GOES flare class obtained by STIX.

Section 3.2: CME

The CME subsection provides information about the associated coronal mass ejection.

• Column 76 (Start time [UT]): Start time of the CME.

• Column 77 (Info): Source of information.

• Column 78 (Speed [km/s]): CME linear speed.

• Column 79 (Width [deg.]): Angular width of the CME.

Section 3.3: Radial distance (R)

• Column 80 (Radial distance [au]): Radial distance of the observing spacecraft from the Sun at the time of the event.

Section 3.4: Solar Wind (SWA)

Solar wind parameters derived from SWA measurements during the event interval.

• Column 81 (Vmax [km/s]): Maximum solar wind speed.

• Column 82 (Vmin [km/s]): Minimum solar wind speed.

• Column 83 (Vmean [km/s]): Mean solar wind speed.

Section 3.5: Magnetic Field (MAG)

• Column 84 (Bmax [nT]): Maximum magnetic field magnitude measured during the event interval.

Section 4: SEP Event Analysis

Section 4.1: Connection Angle

• Column 85 (Connection Angle [deg.]): Longitudinal angular separation between the nominal Parker spiral magnetic footpoint of the observer and the associated solar source region.

Section 4.2: TSA

The TSA subsection contains results derived using the Time Shift Analysis method.

• Column 86 (TSA Solar Release Time [UT]): Estimated solar particle release time derived from TSA.

• Column 87 (TSA Path Length (L) [au]): Assumed Parker spiral path length used in the TSA calculation.

Section 4.3: VDA

The VDA subsection contains results derived using the Velocity Dispersion Analysis method.

• Column 88 (VDA Solar Release Time [UT]): Estimated solar particle release time derived from VDA.

• Column 89 (VDA Solar Release Time Error [min]): Uncertainty of the VDA-derived solar release time.

• Column 90 (VDA Path Length (L) [au]): Apparent interplanetary particle path length derived from VDA.

• Column 91 (VDA Path Length Error [au]): Uncertainty of the VDA-derived path length.

Section 5: Comments

• Column 92 (Comments): Additional remarks, data quality notes, special conditions, or manual annotations related to the event.