Recurrent 3He-rich solar energetic particle injections observed by Solar Orbiter at ∼0.5 au

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Volume 673 (May 2023)

A&A, 673 (2023) L5

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Solar Orbiter First Results (Nominal Mission Phase)

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Table 1.

Characteristics of the Solar Orbiter recurrent events.

Injection	Heliocentric	Type III ^(a)	Jet ^(b)	³He/⁴He ^(c)	Fe/O ^(c)	GOES	Separation ^(d)
number	distance (au)	start (UT)	location			X-ray flare	angle (°)
1	0.55	Mar.-03 11:00	E12S15 ^(e)	...	...	< B3.8	28
2	0.54	Mar.-03 14:16	E06S17	9.91±0.88	3.70±0.64	< B5.0	22
3	0.52	Mar.-05 13:54	W21S16	...	...	B6.0	1
4	0.52	Mar.-05 19:32	W24S15	0.17±0.04	...	< B7.0	1
5	0.51	Mar.-05 23:55	W26S16	0.97±0.02	1.33±0.15	C1.4	6
6	0.51	Mar.-06 07:58	W32S14 ^(e)	1.28±0.08	0.50±0.17	B7.0	5
	0.51	Mar.-06 08:25	W32S17	...	...	B6.4	4

Notes.

^(a)

In STEREO-A.

^(b)

In Stonyhurst heliographic system and SDO AIA 211 Å images.

^(c)

Solar Orbiter SIS 0.32−0.45 MeV nucleon⁻¹.

^(d)

Between the Solar Orbiter magnetic footpoint on the Sun and the jet longitude.

^(e)

No jet seen only brightening. The ACE ULEIS 0.32−0.45 MeV nucleon⁻¹³He/⁴He and Fe/O ratios for injection #5 are 1.45 ± 0.14 and 2.22 ± 0.38, respectively.

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