chapter 8 The Sun Review

What is the approximate average temperature of the Sun's surface?

5800k

The visible surface of the Sun is composed of solid matter.

False

Sunspot numbers follow a seven-year cycle

False 11 years

Of the following parts of the Sun,which is the hottest ?

corona

Which layer of the Sun's atmosphere is represented in a solar eclipse?

corona

Galileo proposed that the Sun is a rotating sphere after he ____________

discovered sunspots

What are the dark regions that give the sun's photosphere a mottled appearance?

granules

Which two elements are most abundant within the sun?

hydrogen & Helium

The Sun is a ball of hot gas held together by its own gravity.

True

The corona can be seen clearly during a total solar eclipse

True

The corona is so dim that it is not visible in earth's daytime sky

True

What is the average distance between the sun and earth?

1 AU

Consider the complete magnetic cycle of sunspot activity on the Sun. Approximately how many years is this cycle?

22 years

The layer above the chromosphere is the photosphere

False

#26-30

Know the layers of the sun

The danger to astronauts from solar flares and coronal mass ejections is greater when?

Sun is at a sunspot maximum

Granules on the Sun's photosphere can be several thousand kilometers across.

True

Sunspots are part of active solar regions dominated by magnetic fields that encompass all layers of the sun's atmosphere

True

Astronomers often record solar images in the ______ part of the electromagnetic spectrum because the gaseous layers high in the sun's atmosphere are very hot and emit most of their light at short wavelengths.

Ultra violet

The granules visible on the sun's surface are evidence of what?

convection

What causes granulation on the photosphere?

convection

What does convection currents on the sun's photosphere look like?

convection currents

What occurs on the surface of the sun during a solar cycle minimum?

the least solar activity in the 11 year cycle

What occurs on the surface on the surface of the Sun during a solar cycle minimum?

the least solar activity in the 11 year cycle

Granulation is caused by convection currents just below the photosphere

true

The underlying cause of the solar cycle is...

winding up of the sun's magnetic field due to differential rotation