Differential cloud models for solar velocity field measurements

Details Differential cloud models for solar velocity field measurements Differential cloud models for solar velocity field measurements

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...203..162m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 203, no. 1, Sept. 1988, p. 162-169.

Astronomy and Astrophysics

Astrophysics

32

Chromosphere, Energy Transfer, H Alpha Line, Mass Flow, Solar Activity, Balmer Series, Clouds, Ejecta, Line Shape, Velocity Distribution

Scientific paper

The analysis of velocity fields in solar ejecta is an important step in understanding mechanisms of acceleration and energy transfer. Unfortunately, Beckers' cloud model is not quite valid in the case of fast mass flows observed on the disk, because of the fluctuations of the chromospheric background in active regions, and because of strong velocity gradients along the line of sight. The authors propose two kinds of differential cloud models (first order and second order) to determine some parameters characterizing the velocity field, in spite of these difficulties. They discuss an example of a solar ejection observed at Meudon observatory.

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