Doppler-velocity Drifts Detected in a Solar Prominence

0559602 - ASÚ 2023 RIV GB eng J - Článek v odborném periodiku
Zapiór, Maciej - Heinzel, Petr - Khomenko, E.
Doppler-velocity Drifts Detected in a Solar Prominence.
Astrophysical Journal. Roč. 934, č. 1 (2022), č. článku 16. ISSN 0004-637X. E-ISSN 1538-4357
Grant CEP: GA ČR(CZ) GA19-17102S; GA ČR(CZ) GC21-16508J
Institucionální podpora: RVO:67985815
Klíčová slova: high-frequency waves * multi-fluid approach * magnetic reconnection
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 4.9, rok: 2022
Způsob publikování: Open access

We analyzed multiline observations of a quiescent prominence from the slit spectrograph located at the Ondrejov Observatory. Dopplergrams and integrated intensity maps of the whole prominence were obtained from observations in six spectral lines: Ca ii H, H epsilon, H beta, He i D3, H alpha, and Ca ii IR. By combining integrated intensity maps with non-LTE radiative-transfer modeling, we carefully identified areas in an optically thin regime. The comparison of the Doppler-velocity maps and scatterplots from different lines shows the existence of differences in the velocity of ions and neutrals called velocity drift. The drift is of a local nature, present mostly at prominence edges in the area with a large velocity gradient, as can be tentatively expected based on multifluid MHD models. We could not explore the time evolution of the drift, since our data set consists of a single scan only. Our paper brings another contribution to a rather controversial problem of the detection of multifluid effects in solar prominences.
Trvalý link: https://hdl.handle.net/11104/0333350