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