Chapter 2: Overview of the Sun

Details Chapter 2: Overview of the Sun Chapter 2: Overview of the Sun

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008psa..book....9h&link_type=abstract

"Physics of the Sun and its Atmosphere, eds. B.N. Dwivedi and U. Narain, World Scientific, Singapore (ISBN 978-981-283-271-9), 2

Physics

1

Scientific paper

The Sun plays a central role in two important respects: firstly, it provides a cosmic laboratory for investigating processes that cannot be simulated in the terrestrial environment and secondly, because of its relative closeness it serves as a proxy for understanding conditions in other stars. Formed about 4.6 billion years from a cloud of gas dust and frozen ice, the Sun at the current epoch in its life is a normal main-sequence star of spectral classification G2 with an average surface temperature of around 5700 K. It displays an astounding range of phenomena on myriad spatial and temporal scales that have traditionally defied comprehension. The Sun's magnetic field, that varies on a 22-year cycle, triggers activity and powerful eruptions that affect regions extending from the Earth's atmosphere to the distant edges of the solar system. Despite the inherent complexities of these processes, some progress has been achieved in understanding them through recent spectacular advances in observational techniques coupled with theoretical modelling...

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