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Stellar Chromospheric Activity

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Author(s): Hall Jeffrey C.

Journal: Living Reviews in Solar Physics
ISSN 1614-4961

Volume: 5;
Start page: 2;
Date: 2008;
Original page

Keywords: Sun | stars | chromospheres

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.

Tango Jona
Tangokurs Rapperswil-Jona

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