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Activity in the Chromosphere and Corona

  • John WilkinsonEmail author
Chapter
Part of the Astronomers' Universe book series (ASTRONOM)

Abstract

Extending out from the photosphere is the Sun’s atmosphere. It can be divided into two main regions – the chromosphere and the corona. The chromosphere is a layer of tenuous gas with a density much less than that of the photosphere. It is about 2,500 km thick with a temperature that varies from 6,000°C just above the photosphere to about 20,000–30,000°C at its top. The chromosphere is characterised by spikes of gas called spicules, giant flames called prominences and solar flares. The chromosphere is important to scientists because it is largely responsible for the deep ultraviolet radiation that bathes the Earth, producing our atmosphere’s ozone layer, and it has the strongest solar connection to climate variability.

Keywords

Solar Wind Coronal Mass Ejection Solar Flare Coronal Hole Geomagnetic Storm 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  1. 1.CastlemaineAustralia

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