The first coronal mass ejection observed in both visible-light and UV H I Ly- α channels of the Metis coronagraph on board Solar Orbiter - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2021

The first coronal mass ejection observed in both visible-light and UV H I Ly- α channels of the Metis coronagraph on board Solar Orbiter

1 OAC - INAF - Osservatorio Astronomico di Capodimonte
2 OATo - INAF - Osservatorio Astrofisico di Torino
3 MPS - Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research
4 Dipartamento di Fisica e Astronomia "Ettore Majorana"
5 OAT - INAF - Osservatorio Astronomico di Trieste
6 ROB - Royal Observatory of Belgium [Brussels]
7 Institute of Geodynamics of the Romanian Academy
8 Dipartimento di Fisica e Astronomia "Galileo Galilei"
9 IFN - CNR Istituto di Fotonica e Nanotecnologie [Padova]
10 INAF - Istituto Nazionale di Astrofisica
11 Dipartimento di Fisica e Astronomia [Firenze]
12 OACT - INAF - Osservatorio Astrofisico di Catania
13 KU Leuven - Catholic University of Leuven = Katholieke Universiteit Leuven
14 IASF-MI - Istituto di Astrofisica Spaziale e Fisica Cosmica - Milano
15 IAS - Institut d'astrophysique spatiale
16 Astronomical Institute [Wroclaw]
17 CISAS - Centro di Ateneo di Studi e Attività Spaziali “Giuseppe Colombo”
18 DiSPea - Dipartimento di Scienze Pure et Applicate
19 INFN, Sezione di Firenze - Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
20 ASU / CAS - Astronomical Institute of the Czech Academy of Sciences
21 UNITO - Università degli studi di Torino = University of Turin
22 DET - Dipartimento di Elettronica e Telecomunicazioni [Torino]
23 NASA Headquarters
24 IEIIT - Istituto di Elettronica e di Ingegneria dell'Informazione e delle Telecomunicazioni
25 ASI - Agenzia Spaziale Italiana
26 IAPS - Istituto di Astrofisica e Planetologia Spaziali - INAF
27 OAPa - INAF - Osservatorio Astronomico di Palermo
29 UNIPV - Università degli Studi di Pavia = University of Pavia
30 Unipd - Università degli Studi di Padova = University of Padua
31 Dipartimento di Fisica [Arcavacata di Rende]
32 DiFC - Dipartimento di Fisica e Chimica “Emilio Segrè”
33 NRL - Naval Research Laboratory
34 Department of Physics [Athens]
35 UCLA - University of California [Los Angeles]
36 Unict - Università degli studi di Catania = University of Catania
Vincenzo Andretta
F. Auchère
D. Moses
  • Function : Author
Philippe Lamy
M. Velli


Context. The Metis coronagraph on board Solar Orbiter offers a new view of coronal mass ejections (CMEs), observing them for the first time with simultaneous images acquired with a broad-band filter in the visible-light interval and with a narrow-band filter around the H I Ly- α line at 121.567 nm, the so-called Metis UV channel. Aims. We show the first Metis observations of a CME, obtained on 16 and 17 January 2021. The event was also observed by the EUI/FSI imager on board Solar Orbiter, as well as by other space-based coronagraphs, such as STEREO-A/COR2 and SOHO/LASCO/C2, whose images are combined here with Metis data. Methods. Different images are analysed here to reconstruct the 3D orientation of the expanding CME flux rope using the graduated cylindrical shell model. This also allows us to identify the possible location of the source region. Measurements of the CME kinematics allow us to quantify the expected Doppler dimming in the Ly- α channel. Results. Observations show that most CME features seen in the visible-light images are also seen in the Ly- α images, although some features in the latter channel appear more structured than their visible-light counterparts. We estimated the expansion velocity of this event to be below 140 km s −1 . Hence, these observations can be understood by assuming that Doppler dimming effects do not strongly reduce the Ly- α emission from the CME. These velocities are comparable with or smaller than the radial velocities inferred from the same data in a similar coronal structure on the east side of the Sun. Conclusions. The first observations by Metis of a CME demonstrate the capability of the instrument to provide valuable and novel information on the structure and dynamics of these coronal events. Considering also its diagnostics capabilities regarding the conditions of the ambient corona, Metis promises to significantly advance our knowledge of such phenomena.
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Dates and versions

insu-03494542 , version 1 (19-12-2021)



Vincenzo Andretta, A. Bemporad, Y. de Leo, G. Jerse, F. Landini, et al.. The first coronal mass ejection observed in both visible-light and UV H I Ly- α channels of the Metis coronagraph on board Solar Orbiter. Astronomy and Astrophysics - A&A, 2021, 656 (December), L14 (10 pp). ⟨10.1051/0004-6361/202142407⟩. ⟨insu-03494542⟩
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