The 17 April 2021 widespread solar energetic particle event

Solar Orbiter First Results (Nominal Mission Phase)

Open Access

Table 3.

First intersection between the coronal shock and magnetic field lines connecting to the spacecraft as determined with the ADAPT-WSA model (Sect. 3).

Spacecraft	r	V_obs	Estimated	Shock
	(au)	(km s⁻¹)	intersection	height ^(a)
			[UT]	[R_⊙]
BepiColombo	0.63	400	16:30 ± 3 min	1.58
Parker solar probe	0.42	328	17:19 ± 3 min	1.45
Solar orbiter	0.84	375	16:55 ± 3 min	1.07
STEREO A	0.97	385	17:24 ± 3 min	1.04
L1	1.00	601	17:30 ± 3 min	1.01

Notes. Times refer to observation times at 1 au.

^(a)

Height from the solar center of the intersection point between the reconstructed CME-driven shock and the field line connecting to the respective spacecraft.

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