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Stars/Sun/Heliospheres/Quiz

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Heliospheres is a lecture from the radiation astronomy department that describes the heliosphere around the Sun.

File:PIA16483 ip trimmed.png
This artist's concept shows plasma flows around NASA's Voyager 1 spacecraft as it approaches interstellar space. Credit: NASA/JPL.

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Quiz

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1 Yes or No, The heliosphere is a bubble in space "blown" into the interstellar medium by the solar wind.

Yes
No

2 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

.

3 Which of the following may not be able to slow down an object entering the heliosphere at 20 km/s?

gravity
electrostatic repulsion
the charge on the surface of the Sun
a comparable charge on the incoming object
electromagnetics
strong forces

4 Complete the text:

Match up the structure of the proto-Sun with the heliogonic 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
apparent outer surface

.
just above the radiative zone

.
top of the radiative zone

.
part of the heliosphere

.
below the corona and above the photosphere

.
below the protostar's radiative zone

.
coolest layer in the protoplanetary disc

.
shear between different parts of the Sun that rotate in the radiative zone

.
above the photosphere

.
transition from almost uniform to differential between radiative and convective zones

.
probably not differentiated as a protostar

.
between the protoplanetary disc and the heliosphere

.

5 Which phenomena are associated with the heliosphere?

a region of space where the interstellar medium is blown away by the solar wind
a bubble in space
virtually all the material emanates from the Sun itself
Voyager 2
Voyager 1
the termination shock

6 The point where the interstellar medium and solar wind pressures balance is called the

7 Complete the text:

Match up the item letter with each of the possibilities below:
Balloons - A
Sounding rockets - B
Aircraft assisted launches - C
Orbital rocketry - D
Shuttle payload - E
Heliocentric rocketry - F
Exploratory rocketry - G
Lunar rover - H
Ranger 5

microcalorimeter arrays

.
MeV Auroral X-ray Imaging and Spectroscopy

.
Lunokhod 2

.
ALEXIS

.
Ulysses

.
Broad Band X-Ray Telescope

.
Solar Heliospheric Observatory

.

8 Measurements from Voyager 1 revealed a steady rise since May in collisions with?

9 Complete the text:

At the same time, in late

, there was a dramatic drop in collisions with

, which are thought to originate from the

.

10 Which of the following is not a characteristic of the heliosphere?

outward speed of the solar wind diminishes to zero
inward pressure from interstellar space is compacting the magnetic field
the solar wind even blows back at us
a 100-fold increase in the intensity of high-energy electrons from elsewhere in the galaxy diffuse into our solar system from outside
the source of heat that brings the coronal cloud near the Sun hot enough to emit X-rays may be the photosphere


Hypotheses

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

See also

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{{Radiation astronomy resources}}

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