Stars/Sun/Heliophysics/Quiz

In the model shown at right the Sun and hypothetical regions around it are labeled.

This image is a theory for the interior of the Sun. Credit: NASA.

Heliophysics is the physics or astrophysics of the closest star to the Earth. It is a lecture from the radiation astronomy department. This is a quiz based on this lecture heliophysics that you are free to take at any time.

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Quiz

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1 True or False, A basic unit of length for measuring the diameter of the Sun is the kilometer.

	TRUE
	FALSE

2 True or False, By assuming gravity causes the Earth and Sun to orbit each other, and assuming a mass for the Earth, a mass for the Sun can be determined from the orbital characteristics.

	TRUE
	FALSE

3 True or False, By correlating the length of an Earth year to a fixed number of seconds, the length of time of a second can be determined.

	TRUE
	FALSE

4 Yes or No, The Sun could have an internal core of iron that generates its bipolar magnetic field.

	Yes
	No

5 True or False, As the principal portion of the sunspot cycle corresponds well with a periodic conjunction of Venus and Jupiter, the increased electron flux to the Sun may cause the magnetic poles to reverse.

	TRUE
	FALSE

6 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 internally.

7 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

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 What features occasionally show a heliographic distribution on the surface of the Sun?

	granulation or supergranulation
	active regions
	coronal holes
	the north an south heliographic poles
	sunspots
	latitudinal bands that rotate at different rates

10 What effects does the distribution of angular momentum in the solar system have on the origin of the Sun?

	an initially spherical and contracting nebula spinning faster as it collapses would produce the present situation in the solar system
	partitioning mass and angular momentum does not seem possible with a contracting nebula
	the rotation axis of the Sun from that of the system as a whole if formed by nebular collapse seems very unlikely
	the angular-momentum problem does not arise with the accretion theory
	surface differential rotation of the Sun results
	by the nature of the floccule process the star so formed will have little angular momentum

Hypotheses

Main article: Hypotheses

1. Timing the Sun is like timing a ball of gas.

See also

• Astrognosy/Quiz
• Heliocentric astronomy/Quiz
• Heliognosy quiz
• Heliogony quiz
• Heliography quiz
• Heliology quiz
• Heliometry quiz
• Heliospheres quiz