Question: Why Is Insolation Greatest At The Equator?

What is Earth’s main source of energy?

Solar radiation is the fundamental energy driving our climate system, and nearly all climatic and biologic processes on Earth are dependent on solar input.

Energy from the sun is essential for many processes on Earth including warming of the surface, evaporation, photosynthesis and atmospheric circulation..

Which is the longest longitude?

The longest is the equator, whose latitude is zero, while at the posts – at scopes 90° north and 90° south (or – 90°) the circles shrink to a point. All longitudes or meridians are equispaced lines of equivalent length, interfacing the north pole and the south pole.

Whats the longest day of the year?

June 20The summer solstice happens today, Saturday, June 20, at 4:43 p.m. CDT. That’s when the sun will reach its northernmost point in the sky. It marks the beginning of summer in the Northern Hemisphere and the beginning of winter in the Southern Hemisphere.

On what dates is the intensity of insolation greatest at the equator?

o, at the equator all year long. The intensity of insolation increases then decreases throughout the year. The greatest intensity is during June 21 and the weakest intensity is during December 21.

Why does the equator receive less insolation?

Equator receives less insolation than tropics. … Equator receives less insolation than tropic due to heavy cloud cover. Remember insolation is the amount of sunlight received at the surface of earth per unit area. So the clouds obstructs the sunlight and hence equator receives less insolation.

Where is insolation the greatest?

At the equinoxes, solar insolation is at a maximum at the equator and is zero at the poles. At the summer solstice of the northern hemisphere, daily insolation reaches a maximum at the North Pole because of the 24-hour-long solar day.

What three factors affect the angle of insolation?

As the angle of insolation decreases, the energy of the rays is spread out over a larger area, so the energy per unit area decreases. The three major factors which affect the angle of insolation are: Latitude, Seasons, and Time of day.

What season has the greatest angle of insolation?

On the summer solstice, the Northern Hemisphere has the greatest number of daylight hours, whereas the Southern Hemisphere has the fewest. The angle of the sun above Earth’s Northern Hemisphere is greatest on this day.

What is the percentage of insolation received by the Earth surface?

51 percentThe amount of energy put out by the Sun is a constant. The incoming solar radiation is known as insolation. The amount of solar energy reaching the Earth is 70 percent. The surface of the Earth absorbs 51 percent of the insolation.

Why is more heat energy received at the equator?

Why is it hotter at the equator than it is at the poles? a. Because the equator is closer to the sun. … Because the sun’s rays hit the earth’s surface at a higher angle at the equator.

How does insolation affect climate?

Insolation’ is the solar radiation that reaches the earth’s surface. … Solar energy received over the planet’s surface varies according to season, latitude, transparency of the atmosphere, and aspect or ground slope. Insolation affects temperature. The more the insolation, the higher the temperature.

What is the longest day of the year at the equator?

June 21The summer solstice is upon us: Friday, June 21 is the longest day of 2019, and the start of the summer season, for anyone living north of the equator.

Where are the longest days on Earth?

Places on the Arctic Circle have the longest total annual daytime, 4,647 hours, while the North Pole receives 4,575. Because of elliptic nature of the Earth’s orbit, the Southern Hemisphere is not symmetrical: the Antarctic Circle, with 4,530 hours of daylight, receives five days less of sunshine than its antipodes.

What is heat balance of the earth?

Earth’s heat balance. … Essentially all of the energy the Earth receives is in radiant energy that originates from the Sun. The temperature of the Earth is a balancing act, with greenhouse gases in the atmosphere contributing to a planet that is inhabitable.

How many hours of daylight do people at the equator experience every day?

12 hoursAlthough the daytime length at the Equator remains 12 hours in all seasons, the duration at all other latitudes varies with the seasons. During the winter, daytime lasts shorter than 12 hours; during the summer, it lasts longer than 12 hours.

At what time of year is the duration of insolation the least?

In the northern hemisphere, the greatest angles of insolation are received on June 21, but the hottest average temperature is not reached until late July or early August. In winter minimal insolation occurs on December 21, but the lowest average temperatures don’t occur until late January or early February.

Where is solar insolation most concentrated on earth?

Note that the sunlight strikes the planet perpendicular to the surface near the equator, but it strikes at an oblique angle near the poles, such that L2>L1. This means that the insolation is more concentrated near the equator and weaker near the poles.

Why do higher latitudes receive less insolation?

Latitude & Climate Zones. … Therefore, higher latitudes receive less heat than lower latitude areas nearer the equator. The Earth’s axis is tilted 23.5° to the perpendicular, meaning that the amount of sunlight that a particular latitude receives changes with the seasons.