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Chapter 9: Problem 20

Auroras are the result of a. the interaction of particles from the Sun and Earth's atmosphere b. upper-atmosphere lightning strikes. c. the destruction of stratospheric ozone, which leaves a hole. d. the interaction of Earth's magnetic field with Earth's atmosphere.

Short Answer

Expert verified
a. the interaction of particles from the Sun and Earth's atmosphere

Step by step solution

01

Understand the Question

The question is about identifying the cause of auroras.
02

Analyze Option A

Option A suggests that auroras are caused by the interaction of particles from the Sun with Earth's atmosphere. This is a known and scientifically supported explanation.
03

Analyze Option B

Option B suggests that auroras are a result of upper-atmosphere lightning strikes. This is not a correct scientific explanation for auroras.
04

Analyze Option C

Option C suggests that auroras are caused by the destruction of stratospheric ozone, which leaves a hole. This is incorrect; the destruction of ozone does not create auroras.
05

Analyze Option D

Option D suggests that auroras result from the interaction of Earth's magnetic field with Earth's atmosphere. While Earth's magnetic field plays a role, it is the particles from the Sun interacting with this magnetic field that ultimately cause auroras.
06

Choose the Correct Answer

Based on the analysis, the correct answer is found in option A.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Solar Particles
Auroras are stunning natural light displays seen mostly near the polar regions. These beautiful lights appear because of particles from the Sun. The Sun constantly releases charged particles called the solar wind. This wind is made up of electrons and protons. When these particles travel through space and reach Earth, they encounter the Earth's magnetic field which guides them toward the poles. Here, they interact with the gases in the Earth's atmosphere, creating the mesmerizing lights known as auroras.
Earth's Atmosphere
The Earth's atmosphere plays a critical role in the formation of auroras. When solar particles reach the atmosphere, they collide with gas molecules. These collisions cause the gas molecules to become excited and eventually release light. The type of light emitted depends on the specific gas involved in the collision:
  • Oxygen atoms tend to give off green and red light.
  • Nitrogen atoms usually produce blue or purplish-red light.
These interactions occur primarily in the ionosphere, a layer of the atmosphere full of electrically charged particles, which is located about 60 to 600 miles above the Earth's surface. The vibrant colors and ever-changing patterns of auroras are a direct result of these high-energy collisions.
Magnetic Field
The Earth's magnetic field is essential in the creation of auroras. Think of it as an invisible shield around our planet, protecting us from harmful space radiation. This magnetic field is generated by the movement of molten iron in Earth's outer core. When solar particles fly towards Earth, they get trapped by this magnetic field.

The magnetic field channels these particles toward the polar regions, both in the north (creating the Northern Lights or Aurora Borealis) and in the south (creating the Southern Lights or Aurora Australis). Once trapped in these regions, the solar particles interact with the Earth's atmosphere, leading to the beautiful light displays we see as auroras. This complex interaction showcases the incredible dynamics between the Sun's energy and Earth's natural defenses.

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Most popular questions from this chapter

Go to the website for the \(M A V E N\) mission, scheduled for launch in late 2013 (http://lasp.colorado.edu/home/maven). What are the scientific goals of the mission? Will this mission be a lander, an orbiter, or a flyby? What instruments will be used? How will this mission contribute to the understanding of climate change on Mars? Go to the NASA Web pages for \(M A V E N\) (http://nasa.gov/mission_pages/maven/main/ index.html). Has it been launched? Has it arrived on Mars? Is it taking data; are there any results?

Imagine that you check the barometric pressure and find that it is only \(920 \mathrm{mb}\). Two possible effects could be responsible for this lower-than- average reading. What are they?

The total mass of Earth's atmosphere is \(5 \times 10^{18} \mathrm{kg}\). Carbon dioxide \(\left(\mathrm{CO}_{2}\right)\) makes up about 0.06 percent of Earth's atmospheric mass. a. What is the mass of \(\mathrm{CO}_{2}\) (in kilograms) in Earth's atmosphere? b. The annual global production of \(\mathrm{CO}_{2}\), is now estimated to be 3 \(\times 10^{13} \mathrm{kg} .\) What annual fractional increase does this represent? c. The mass of a molecule of \(\mathrm{CO}_{2}\) is \(7.31 \times 10^{-26} \mathrm{kg}\). How many molecules of \(\mathrm{CO}_{2}\) are added to the atmosphere each year? d. Why does an increase in \(\mathrm{CO}_{2}\) have such a big effect, even though it represents a small fraction of the atmosphere?

The ozone layer protects life on Earth from a. high-energy particles from the solar wind. b. micrometeorites. c. ultraviolet radiation. d. charged particles trapped in Earth's magnetic field.

Using the average density of air at sea level (1.225 kilograms per cubic meter, or \(\mathrm{kg} / \mathrm{m}^{3}\) ) and the average mass of Earth's atmosphere above sea level per square meter \(\left(1.033 \times 10^{4} \mathrm{kg} /\right.\) \(\mathrm{m}^{2}\), calculate the total depth of Earth's atmosphere (in kilometers) if its density were the same at all altitudes. (This value is called a scale height, a useful quantity for comparing Earth's atmosphere with the atmospheres of other planets.)
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