Vol. 5 (2008) > lrsp-2008-2

doi: 10.12942/lrsp-2008-2
Living Rev. Solar Phys. 5 (2008), 2

Stellar Chromospheric Activity

1 Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001, U.S.A.

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Article Abstract

The Sun, stars similar to it, and many rather dissimilar to it, have chromospheres, regions classically viewed as lying above the brilliant photosphere and characterized by a positive temperature gradient and a marked departure from radiative equilibrium. Stellar chromospheres exhibit a wide range of phenomena collectively called activity, stemming largely from the time evolution of their magnetic fields and the mass flux and transfer of radiation through the complex magnetic topology and the increasingly optically thin plasma of the outer stellar atmosphere. In this review, I will (1) outline the development of our understanding of chromospheric structure from 1960 to the present, (2) discuss the major observational programs and theoretical lines of inquiry, (3) review the origin and nature of both solar and stellar chromospheric activity and its relationship to, and effect on, stellar parameters including total energy output, and (4) summarize the outstanding problems today.

Keywords: Solar chromosphere, Stellar chromospheres

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Since a Living Reviews in Solar Physics article may evolve over time, please cite the access <date>, which uniquely identifies the version of the article you are referring to:

Jeffrey C. Hall,
"Stellar Chromospheric Activity",
Living Rev. Solar Phys. 5,  (2008),  2. URL (cited on <date>):
http://www.livingreviews.org/lrsp-2008-2

Article History

ORIGINAL http://www.livingreviews.org/lrsp-2008-2
Title Stellar Chromospheric Activity
Author Jeffrey C. Hall
Date accepted 29 January 2008, published 10 March 2008
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