Metis on board Solar Orbiter is the space coronagraph developed by an Italian-German-Czech consortium. It is capable of observing solar corona and various coronal structures in the visible-light (VL) and UV (hydrogen Ly alpha) channels simultaneously for the first time. Here we present observations of a large eruptive prominence on 2021 April 25-26, in the VL, taken during the mission cruise phase, and demonstrate that apart from the broadband continuum emission, which is due to the Thomson scattering on prominence electrons, we detect a significant radiation in the neutral-helium D3 line (587.6 nm), which lies within the Metis VL passband. We show how the prominence looks like in Stokes I, Q, and U. We consider two extreme cases of the prominence magnetic field, and we separate the Stokes I and Q signals pertinent to Thomson scattering and to the D3 line. The degree of linear polarization of the D3 line (both Q and U) indicates the presence of the prominence magnetic field; hence Metis can serve as a magnetograph for eruptive prominences located high in the corona.

First Metis Detection of the Helium D3 Line Polarization in a Large Eruptive Prominence / Heinzel, Petr; Jejčič, Sonja; Štěpán, Jiří; Susino, Roberto; Andretta, Vincenzo; Russano, Giuliana; Fineschi, Silvano; Romoli, Marco; Bemporad, Alessandro; Berlicki, Arkadiusz; Burtovoi, Aleksandr; Da Deppo, Vania; De Leo, Yara; Grimani, Catia; Jerse, Giovanna; Landini, Federico; Naletto, Giampiero; Nicolini, Gianalfredo; Pancrazzi, Maurizio; del Pino Alemán, Tanausú; Sasso, Clementina; Spadaro, Daniele; Stangalini, Marco; Telloni, Daniele; Teriaca, Luca; Uslenghi, Michela; Arévalo, Andrés Vicente. - In: THE ASTROPHYSICAL JOURNAL LETTERS. - ISSN 2041-8205. - ELETTRONICO. - 957:(2023), pp. L10.0-L10.0. [10.3847/2041-8213/acff62]

First Metis Detection of the Helium D3 Line Polarization in a Large Eruptive Prominence

Romoli, Marco;Burtovoi, Aleksandr;
2023

Abstract

Metis on board Solar Orbiter is the space coronagraph developed by an Italian-German-Czech consortium. It is capable of observing solar corona and various coronal structures in the visible-light (VL) and UV (hydrogen Ly alpha) channels simultaneously for the first time. Here we present observations of a large eruptive prominence on 2021 April 25-26, in the VL, taken during the mission cruise phase, and demonstrate that apart from the broadband continuum emission, which is due to the Thomson scattering on prominence electrons, we detect a significant radiation in the neutral-helium D3 line (587.6 nm), which lies within the Metis VL passband. We show how the prominence looks like in Stokes I, Q, and U. We consider two extreme cases of the prominence magnetic field, and we separate the Stokes I and Q signals pertinent to Thomson scattering and to the D3 line. The degree of linear polarization of the D3 line (both Q and U) indicates the presence of the prominence magnetic field; hence Metis can serve as a magnetograph for eruptive prominences located high in the corona.
2023
957
0
0
Goal 13: Climate action
Heinzel, Petr; Jejčič, Sonja; Štěpán, Jiří; Susino, Roberto; Andretta, Vincenzo; Russano, Giuliana; Fineschi, Silvano; Romoli, Marco; Bemporad, Alessa...espandi
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1353496
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? 1
social impact