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Stars/Sun/Heliophysics/Quiz

< Stars | Sun | Heliophysics

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

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Main resource: Hypotheses
  1. Timing the Sun is like timing a ball of gas.

See also

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