Radial evolution of the April 2020 stealth coronal mass ejection between 0.8 and 1 AU - Comparison of Forbush decreases at Solar Orbiter and near the Earth

Solar Orbiter First Results (Cruise Phase)

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Table 1.

CME and SIR parameters derived from the in situ measurements at Solar Orbiter and near Earth.

	Solar Orbiter	Near Earth
Radial distance

R [AU]	0.809	0.995 ^(a)/1.005 ^(b)

CME and SIR onset times

t_shock [UTC]	2020-04-19 05:06	2020-04-20 02:40
t_CME [UTC]	2020-04-19 08:58	2020-04-20 09:01
t_CMEend [UTC]	2020-04-20 01:11	2020-04-21 02:32
t_forwardshock [UTC]	2020-04-20 05:22 ^(c)	2020-04-21 06:15
t_{streaminterface} [UTC]	2020-04-20 09:15 ^(c)	2020-04-21 12:58
t_reverseshock [UTC]	2020-04-20 13:47 ^(c)	2020-04-21 21:11

Duration

Δt_sheath [h]	3.9	6.4
Δt_CME [h]	16.2	17.5

In situ parameters

B_max [nT]	21.2	16.2
[km s⁻¹]	–	347
v_exp [km s⁻¹]	–	46
A_FD [%]	2.9	2.0

Notes. Listed Forbush decrease amplitudes A_FD correspond to the HET C counter at Solar Orbiter and the CRaTER D2 counter near Earth.

^(a)

L1,

^(b)

Earth,

^(c)

due to the missing plasma data, SIR onset times are less certain at SolO.

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