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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

Andretta, V., Bemporad, A., De Leo, Y., Jerse, G., Landini, F., Mierla, M., et al. (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. Astronomy and Astrophysics, 656: L14. doi:10.1051/0004-6361/202142407.

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Genre: Journal Article
Other : The first coronal mass ejection observed in both visible-light and UV HI Ly-α channels of the Metis coronagraph on board Solar Orbiter
Other : The first coronal mass ejection observed in both visible-light and UV H I Ly-alpha channels of the Metis coronagraph on board Solar Orbiter


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Andretta, V., Author
Bemporad, A., Author
De Leo, Yara1, Author           
Jerse, G., Author
Landini, F., Author
Mierla, M., Author
Naletto, G., Author
Romoli, M., Author
Sasso, C., Author
Slemer, A., Author
Spadaro, D., Author
Susino, R., Author
Talpeanu, D.-C., Author
Telloni, D., Author
Teriaca, Luca1, Author           
Uslenghi, M., Author
Antonucci, E., Author
Auchère, F., Author
Berghmans, D., Author
Berlicki, A., Author
Capobianco, G., AuthorCapuano, G. E., AuthorCasini, C., AuthorCasti, M., AuthorChioetto, P., AuthorDa Deppo, V. , AuthorFabi, M., AuthorFineschi, S., AuthorFrassati, F., AuthorFrassetto, F., AuthorGiordano, S., AuthorGrimani, C., AuthorHeinzel, P., AuthorLiberatore, A., AuthorMagli, E., AuthorMassone, G., AuthorMesserotti, M., AuthorMoses, D., AuthorNicolini, G., AuthorPancrazzi, M., AuthorPelizzo, M.-G., AuthorRomano, P., AuthorSchühle, Udo1, Author           Stangalini, M., AuthorStraus, Th., AuthorVolpicelli, C. A., AuthorZangrilli, L., AuthorZuppella, P., AuthorAbbo, L., AuthorAznar Cuadrado, Regina1, Author           Bruno, R., AuthorCiaravella, A., AuthorD’Amicis, R., AuthorLamy, P., AuthorLanzafame, A., AuthorMalvezzi, A. M., AuthorNicolosi, P., AuthorNisticò, G., AuthorPeter, Hardi1, Author           Plainaki, C., AuthorPoletto, L., AuthorReale, F., AuthorSolanki, Sami K.1, Author           Strachan, L., AuthorTondello, G., AuthorTsinganos, K., AuthorVelli, M., AuthorVentura, R., AuthorVial, J.-C., AuthorWoch, Joachim1, Author           Zimbardo, G., Author more..
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              


Free keywords: Sun: atmosphere / Sun: corona / Sun: UV radiation / Sun: coronal mass ejections (CMEs)
 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.


Language(s): eng - English
 Dates: 2021
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Degree: -



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Source 1

Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: - Volume / Issue: 656 Sequence Number: L14 Start / End Page: - Identifier: ISSN: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1