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Infrared and Submillimeter Diagnostics of Activity and Flares

Published online by Cambridge University Press:  03 August 2017

A. Falchi ,
R. Falciani  and
P. Mauas
A. Falchi
Affiliation:
Osservatorio Astrofisico di Arcetri, Largo Fermi 5, I-50125 Florence, Italy
R. Falciani
Affiliation:
Dipartimento di Astronomia, Universitá di Firenze, Largo Fermi 5, I-50125 Florence, Italy
P. Mauas
Affiliation:
Osservatorio Astrofisico di Arcetri, Largo Fermi 5, I-50125 Florence, Italy

Abstract

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We give a critical review of the observations of solar activity in the IR and sub-mm range, which are quite scarce, except for the Fe I triplet at 1.56 μm and the Mg I emission lines at 12.32 μm. These, however, are mainly intended for solar magnetic field studies rather than physical diagnostics on activity phenomena. We compute the emission in some continuuum windows and in some detectable Paschen and Brackett lines in two extreme flare models, viz. a “chromospheric” and a white-light flare model. The utility of the Paschen and Brackett lines as diagnostics of the atmospheric state is questionable since more information can be obtained more easily by observing the higher Balmer lines. On the other hand, observations in various continuum windows can be of high scientific value and efficiency. We also discuss possible coordination with simultaneous visible observations, in order to increase the diagnostic efficiency of a prospective observing run.

Keywords

infrared: starsSun: activitySun: flares
Type
Part 1: Infrared Diagnostics of the Solar Atmosphere and Solar Activity
Information
Symposium - International Astronomical Union , Volume 154: Infrared Solar Physics , 1994 , pp. 113 - 123
Copyright
Copyright © Kluwer 1994 

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