NDLI: Filament Observations with Soho Sumer/cds: The Behaviour of Hydrogen Lyman Lines

Content Provider	Springer Nature Link
Author	Schmieder, B. Heinzel, P. Kucera, T. Vial, J. C.
Copyright Year	1998
Abstract	On 21 September 1996, a filament close to an area of enhanced network was observed with the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrometer and Coronal Diagnostic Spectrometer (CDS). CDS provided intensity, Doppler shift and linewidth maps of the region in six lines whose temperature range covers 10$^{4}$ to 10$^{6}$ K. SUMER observations consisted of maps of the region in four hydrogen Lyman lines (Lδ, L∈, L-6, L-7) and a Svi line (944 Å). In all the Lyman lines we detect a central absorption and an asymmetry in the intensity of the two peaks. First NLTE computations indicate that such reversed Lyman profiles and their absolute intensities can be reproduced with the existing filament models provided that we take into account a prominence-corona transition region (PCTR). We discuss the Lyman lines' asymmetry in terms of macroscopic flows by comparison with the Hei line Doppler shifts observed with CDS.
Starting Page	309
Ending Page	326
Page Count	18
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	181
Issue Number	2
e-ISSN	1573093X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1998-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astrophysics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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Filament Observations with Soho Sumer/cds: The Behaviour of Hydrogen Lyman Lines