Transcript Sun ppt
THE SUN The Sun is a star = hot ball of plasma fuelled by nuclear fusion at its core Age: 4.6 billion years 4.60 billion years old Solar Dynamic Observatory (SDO) Different features of the Sun can be revealed by viewing it under different wavelengths https://youtu.be/kS57VH3QN1g Layers of the Sun Corona 2 millionoC; 2100 km above photosphere Chromosphere Sits above photosphere Photosphere “Sphere of light” Layer of Sun’s atmosphere; 6000oC Sunspot Areas of strong magnetic field located on the photosphere; cooler than surrounding; 4500oC Core Nuclear fusion reaction occurs (H atoms fused into He atoms); 15 mil. oC The churning motion of the Sun's convection zone creates magnetic fields that • float to the surface (photosphere) and • appear as darker (cooler) sunspots Monitor the Sun live:http://www.helioviewer.org Sun’s rotation The Sun rotates faster at its equator Inferences? the Sun is not a solid body; it doesn’t have uniform rotation Sun’s Corona mass ejection (cme) • Huge emission of energy and charged particles • So powerful that it shuts down communications, power grids, satellites on Earth Solar wind Solar flare/storm = an intense burst of a stream of fastradiation coming from moving charged the release of particles ejected by magnetic energy the Sun – creates associated with Auroras sunspots. Solar flares/ corona mass ejection Pros - Can disrupt - Gives beautiful auroratelecommunications fantastic light show - Damage electronic equipment - Cause overload of power network resulting in blackout Practice Label the layers of the Sun • Watch Secret of the Sun Secret of the Sun https://www.youtube.com/watch?v=ncphh8FWUUE