THE SUN IS THE STAR AT THE CENTRE of
the Solar System. It is about 5 billion years old and will continue to shine as it does now for about another 5 billion years.
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| The Sun |
The Sun is a
Yellow Main Sequence Star(explained in the Previous Blog Part-7)
about 1.4 million kilometers in diameter. It consists almost entirely of hydrogen and helium. In the Sun's core, hydrogen is converted to helium by nuclear fusion, releasing energy in the process. The energy travels from the core, through the
Radiative and Convective Zones, to the
Photosphere (visible surface), where it leaves the Sun in the form of heat and light. On the Photosphere there are often dark, relatively cool areas called
Sunspot, which usually appear in pairs or groups and are caused by the
Cooling effect of Magnetic Field.
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| Internal and External Structure of the Sun |
Other types of solar activity are
Flares, which are usually associated with the
Sunspots, and
Prominences. Flares are sudden discharge of high-energy radiation and atomic particles.
Prominences are huge loops or filaments of gas extending into the solar atmosphere; some last for hours, others for months. Beyond the
Photosphere is the
Chromosphere (inner atmosphere) and the rarified
Corona (outer atmosphere), which extends millions of kilometers into space. Tiny particles that escape from the
Corona give rise to the Solar Wind, which streams through space at hundreds of kilometers per sec.
The Chromosphere and Corona can be seen from earth when the Sun is totally eclipsed by the Moon.
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How a Solar Eclipse occrs
Total Solar Eclipse
Temperature of the Sun
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