From Wikiversity
< Stars‎ | Sun‎ | Heliognosy
Jump to navigation Jump to search
This computer-generated diagram of internal rotation in the Sun shows differential rotation in the outer convective region and almost uniform rotation in the central radiative region. Credit: Global Oscillation Network Group (GONG).

Heliognosy is a lecture and an article focusing on the structure and composition of the Sun. It is a lecture as part of the radiation astronomy course on solar astronomy.

You are free to take this quiz based on heliognosy at any time.

To improve your score, read and study the lecture, the links contained within, listed under See also, External links, and in the {{radiation astronomy resources}} template. This should give you adequate background to get 100 %.

As a "learning by doing" resource, this quiz helps you to assess your knowledge and understanding of the information, and it is a quiz you may take over and over as a learning resource to improve your knowledge, understanding, test-taking skills, and your score.

Suggestion: Have the lecture available in a separate window.

To master the information and use only your memory while taking the quiz, try rewriting the information from more familiar points of view, or be creative with association.

Enjoy learning by doing!

Quiz[edit | edit source]


1 Yes or No, The Sun is sometimes called Sol and other times Helio.


2 True or False, Boron is the third most abundant element detected on the Sun.


3 Complete the text:

Hoyle notes that he and others in the

circles to which he was privy continued until after the

to believe that the Sun was made mostly of


4 Yes or No, Astronomy of the Sun may be called helionomy.


5 True or False, Hydrogen has an emission line in the cyan.


6 The core of the Sun was believed to be made mostly of iron to explain what?

the source of neutrinos
the Sun's global magnetic field
the existence of magnetic poles like the Earth
the rotation of the Sun
surface differential rotation of the Sun
magnetic field reversals like the Earth

7 Yes or No, Until after the Second World War some continued to believe that the Sun was made mostly of iron.


8 Complete the text:

Match up the structure of the Sun with the characteristic or property:
radiative zone - L
core - M
convection zone - N
dynamo - O
tachocline - P
photosphere - Q
atmosphere - R
temperature region - S
chromosphere - T
transition region - U
corona - V
heliosphere - W
diffusion rather than convection

bow shock

weakly ionized, relatively cold and dense plasma

X-ray emission

normally invisible

circular mass movement of plasma

coolest layer of the Sun

shear between different parts of the Sun that rotate at different rates

above the photosphere

transition from almost uniform to differential rotation

150 g/cm3

ultraviolet emission


9 Yes or No, The high-hydrogen, low-iron model was suddenly adopted without opposition.


10 Yes or No, The radiation zone or radiative zone is a layer of a star's interior where energy is primarily transported toward the exterior by means of radiative diffusion, rather than by convection.


Hypotheses[edit | edit source]

  1. The center of the Sun could still be made of iron and be the source of the global magnetic field.

See also[edit | edit source]

External links[edit | edit source]

{{Radiation astronomy resources}}