Free Powerpoint Presentations

Classroom Presentation about the Sun
Page
2

DOWNLOAD

PREVIEW

WATCH ALL SLIDES

§ Dark regions are where cooler material is sinking.

§ Material rises/sinks @ ~1 km/sec (2200 mph; Doppler).

Slide 11

The Solar Atmosphere

The Solar Atmosphere

§ The solar spectrum has thousands of absorption lines

§ More than 67 different elements are present!

§ Hydrogen is the most abundant element followed by Helium (1st discovered in the Sun!)

Spectral lines only tell us about the part of the Sun that forms them (photosphere and chromosphere) but these elements are also thought to be representative of the entire Sun.

Slide 12

Chromosphere

Chromosphere

Slide 13

Chromosphere (seen during full Solar eclipse)

Chromosphere (seen during full Solar eclipse)

§ Chromosphere emits very little light because it is of low density

§ Reddish hue due to 3®2 (656.3 nm) line emission from Hydrogen

Slide 14

SOHO SPECTROHELIOGRAMS TODAY

SOHO SPECTROHELIOGRAMS TODAY

Slide 15

Chromosphere (seen during full Solar eclipse)

Slide 16

Chromosphere (seen during full Solar eclipse)

Slide 17

Slide 18

Slide 19

Solar Wind

Solar Wind

Slide 20

Solar Wind

Solar Wind

v Coronal gas has enough heat (kinetic) energy to escape the Sun’s gravity.

v The Sun is evaporating via this “wind”.

vSolar wind travels at ~500 km/s, reaching Earth in ~3 days

v The Sun loses about 1 million tons of matter each second!

vHowever, over the Sun’s lifetime, it has lost only ~0.1% of its total mass.

Slide 21

Hot coronal gas (~1,000,000 K) emits mostly in X-rays.

Hot coronal gas (~1,000,000 K) emits mostly in X-rays.

Coronal holes are sources of the solar wind (lower density regions)

Coronal holes are related to the Sun’s magnetic field

Slide 22

The Active Sun

The Active Sun

Most of theSolar luminosity is continuous photosphere emission.

But, there is an irregular component

(contributing little to the Sun’s total luminosity).

Slide 23

Sunspots

Sunspots

Granulation around sunspot

Slide 24

Go to page:
 1  2  3  4 

Contents

Last added presentations

© 2010-2024 powerpoint presentations