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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

Vincenzo Andretta 1, * A. Bemporad 2 Y. de Leo 3, 4 G. Jerse 5 F. Landini 2 M. Mierla 6, 7 G. Naletto 8, 9, 10 M. Romoli 11, 10 C. Sasso 1 A. Slemer 9 D. Spadaro 12 R. Susino 2 D.-C. Talpeanu 6, 13 D. Telloni 2 L. Teriaca 3 M. Uslenghi 14 E. Antonucci 10 F. Auchère 15 D. Berghmans 6 A. Berlicki 16 G. Capobianco 2 G. Capuano 12, 4 C. Casini 9, 17 M. Casti 10, 18 P. Chioetto 9, 17 V. da Deppo 9, 10 M. Fabi 18, 19 S. Fineschi 2 F. Frassati 2 F. Frassetto 9, 10 S. Giordano 2 C. Grimani 19, 18 P. Heinzel 20 A. Liberatore 2, 21 E. Magli 22 G. Massone 2 M. Messerotti 5 D. Moses 23 G. Nicolini 5 M. Pancrazzi 2 M.-G. Pelizzo 24 P. Romano 12 U. Schühle 3 M. Stangalini 25 Th. Straus 1 C. Volpicelli 2 L. Zangrilli 2 P. Zuppella 10, 9 L. Abbo 2 R. Aznar Cuadrado 3 R. Bruno 26 A. Ciaravella 27 R. D’amicis 26 Philippe Lamy 28 A. Lanzafame 10, 4 A. Malvezzi 29 P. Nicolosi 9, 30 G. Nisticò 31 H. Peter 3 C. Plainaki 10, 25 L. Poletto 9 F. Reale 10, 32 S. Solanki 3 L. Strachan 33 G. Tondello 30 K. Tsinganos 34 M. Velli 35 R. Ventura 36 Jean-Claude Vial 15 J. Woch 3 G. Zimbardo 10, 31 
* Corresponding author
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : 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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Submitted on : Sunday, December 19, 2021 - 5:01:01 PM
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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, EDP Sciences, 2021, 656 (December), L14 (10 pp). ⟨10.1051/0004-6361/202142407⟩. ⟨insu-03494542⟩



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