Table 1.

Selected events sorted by duration of the onset interval, as measured by STIX, from the very first detection of HXRs to the start of the impulsive phase.

Flare Onset Duration GOES GOES bk. Flare Distance Separation angle
(Publication) interval onset interval [s] class interval location SO – Sun [AU] SO – Earth [deg]
SOL2021-09-23 15:23:15 15:22:30
(Stiefel et al. 2023) 15:23:28 ≤18 M1.8 15:23:10 E17S36 0.60 34

SOL2021-05-07 18:45:55 18:44:00
(Mondal et al., in prep.) 18:48:40 165 M3.9 18:45:40 E76N17 0.92 97

SOL2021-10-09 06:24:23 06:23:00
(Jebaraj et al. 2023) 06:29:10 287 M1.6 06:24:10 E08N12 0.68 15

SOL2022-03-11 22:14:03 22:02:00
(–) 22:28:08 845 M2.3 22:02:10 W60S24 0.45 8

Notes. All times are given in Earth UT. “SO” in the table stands for Solar Orbiter and “bk” for background.

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