Line Broadening in a Limb Flare: Derivation of Macro-turbulent Velocity Fields

Details Line Broadening in a Limb Flare: Derivation of Macro-turbulent Velocity Fields Line Broadening in a Limb Flare: Derivation of Macro-turbulent Velocity Fields

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002chjaa...2..277l&link_type=abstract

Chinese Journal of Astronomy & Astrophysics, Vol. 2, p. 277-286

Astronomy and Astrophysics

Astrophysics

4

Sun: Flares, Sun: Atmospheric Motions, Line: Profiles

Scientific paper

The line profiles of Hα in a limb flare on 1998 November 11 appear to be unusually broadened. It is considered that macro-turbulence (or macroscopic mass motions) may be one of the main causes. We use an inversion technique to extract the probability distribution of the line-of-sight velocity in the flare. There exist some differences between the velocity distributions deduced from Hα and from Ca II λ 8542, which may be because the two lines depend differently on the temperature and velocity. Since the loop density is high, we obtain a rather short cooling time (several tens of seconds) from the hot X-ray loops to the cool loops visible in Hα. Possible origins of the large scale motions are discussed.

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