What conclusion can be reached if the Sun appears less bright at its limb than at the center? (a)
Light from the limb is reddened by solar rotation and appears cooler and therefore less intense
.
What causes sunspots on the Sun quizlet?
What causes sunspots?
Magnetic fields breaking through the photosphere inhibit gas motion
where the field is strong.
Does the Sun have a solid surface and where or why not?
The Sun is a giant ball of plasma (electrified gas), so
it doesn’t have a distinct, solid surface like Earth
. Sunlight that is created by nuclear fusion in the Sun’s core (center) gradually works it’s way outward, colliding over and over with atoms in the Sun’s interior.
Which of the following is not caused by magnetic field activity on the Sun?
Which of the following is NOT caused by magnetic field activity on the Sun?
Convective cells
.
What is the photosphere of the Sun quizlet?
Definition: The photosphere is
the visible surface of the sun
. Sentence with extra information: The photosphere is the innermost layer of the sun. Definition: The chromosphere is outside of the photosphere and is approximately 2,500 km thick and has a temperature of nearly 30,000 Kelvin.
What is the coolest part of the Sun?
While the center of the Sun’s core can get as hot as 30 million degrees F, its outer layers cool down.
The photosphere
, which is outside the core, is the coolest layer.
Is Sun a gas or solid?
The sun is not a solid mass
. It does not have easily identifiable boundaries like rocky planets like Earth. Instead, the sun is composed of layers made up almost entirely of hydrogen and helium.
What is the best reason astronomers have come up with to explain why sunspots?
What is the best reason astronomers have come up with to explain why sunspots are cooler and look darker?
Sunspots are places where the strong magnetic fields in the Sun resist the upward motion of bubbling hot gases from underneath
. … Coronal Mass Ejections from the Sun have many serious effects on or near the Earth.
How does the number of sunspots on the Sun vary with time?
How does the number of sunspots on the Sun vary with time? The number of sunspots varies relatively regularly, with a period of about 11 years.
observing the wavelength splitting of atomic spectral lines by the Zeeman effect
. hydrogen nuclei and electrons, some He nuclei.
Why does the Sun shine?
The Sun shines
by turning hydrogen into helium in its core
. This process is called nuclear fusion. Fusion happens when lighter elements are forced together to become heavier elements. When this happens, a tremendous amount of energy is created.
What is Corona of Sun?
Definition: Corona is
a luminous envelope of plasma that surrounds the Sun and other celestial bodies
. It is extended to millions of kilometres into space and is commonly seen during a total solar eclipse. … The composition of the corona is the same as the interior of the Sun, mainly made up of hydrogen but ionized form.
Why does the Sun have an 11-year cycle?
The Short Answer:
The Sun’s magnetic field goes through a cycle, called the solar cycle. Every 11 years or so,
the Sun’s magnetic field completely flips
. This means that the Sun’s north and south poles switch places. Then it takes about another 11 years for the Sun’s north and south poles to flip back again.
What cycle is the Sun in currently?
The Sun has a cycle lasting roughly 11 years during which its activity is tracked by counting how many sunspots are counted by solar scientists. That’s been done since 1755, which is classed as
Solar Cycle 1
.
Does the Sun have a photosphere?
Photosphere – The photosphere is
the deepest layer of the Sun that we can observe directly
. It reaches from the surface visible at the center of the solar disk to about 250 miles (400 km) above that.
How do astronomers know how strong the magnetic field of the Sun is quizlet?
Astronomers can measure magnetic fields on the sun using . …
Sunspots have extremely strong
magnetic fields which are believed to inhibit the flow of gas. Consequently, convection is reduced below the sunspot and the surface there is cooler.
