Table 1.

CIR-associated energetic particle event properties.

Event 1 2 3 4 5 6
Solar Start time (a) 23 Apr. (114) 1 May (122) 19 May (140) 3 Jun. (155) 1 Jul. (183) 29 Aug. (242)
Orbiter 10:00 (e) 20:00 04:00 20:00 11:00 02:00
SIS End time (a) 24 Apr. (115) 7 May (128) 21 May (142) 9 Jun. (161) 7 Jul. (189) 30 Aug. (243)
21:00 03:00 16:00 10:00 19:00 19:00
Distance (au) (b) 0.78 0.73 0.62 0.54 0.56 0.89
H spectral index (c) −3.5 −3.6 −2.9 −2.8 −3.1 −3.6
4He spectral index (c) −4.1 −4.2 −3.5 −3.9 −3.5 −5.1

ACE Start time (a) 21 Apr. (112) 3 May (124) 21 May (142) 1 Jun. (153) 30 Jun. (182) (d)
ULEIS 07:00 00:00 15:00 19:00 19:00
End time (a) 24 Apr. (115) 4 May (125) 22 May (143) 8 Jun. (129) 1 Jul. (183) (d)
12:00 22:00 12:00 00:00 20:00
4He spectral index (c) −3.9 −4.9 −3.2 −4.1 -4.0 (d)

Notes.

(a)

Year: 2020, with day of year in parentheses.

(b)

Solar Orbiter heliocentric distance (au).

(c)

In energy, over the energy range 0.2−1 MeV/nuc.

(d)

No corresponding ULEIS observation.

(e)

Start time for event 1 was impacted by the SIS high-voltage ramp-up.

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