Atmospheric Sciences

The requirement is to place the satellite in such a way that it appears motionless in the sky, as seen from the surface of the earth. This is a great advantage in satellite communication, because if the satellite appears stationary, then the dish antenna on the ground doesn't have to move to follow the satellite ... the dish can be aimed once, and can stay in the same position permanently. In order to have the satellite appear motionless, it has to follow the 24-hour rotation of the earth. The orbital period of any satellite's revolution (around a much larger body) depends only on the average orbital distance. For the earth, the period of a 238,000-mile orbit (where the moon is) is about 27 days, and the period of an orbit that averages about 22,400 miles is 24 hours. So a communications satellite in an orbit with this average distance will complete one revolution around the earth in 24 hours. Wherever it is right now, it will appear in the same exact place 24 hours from now. This is a "geosynchronous" orbit. But that's not good enough yet. The orbit may have the right average distance, but it may still be very eccentric, ranging from close-in to way-out in the course of 24 hours. If that's the case, then it will move faster when it's closer in, and slower when it's farther out. Watching it from the earth, it'll appear to move back and forth like a pendulum, returning to the same position every 24 hours but making a complete left-right swing every day. This still wouldn't be useful for stationary ground-based dish antennas. So another restriction on the orbit is that it must not only be at the correct average distance, but it must also be very close to a circular shape, so that the satellite's speed in the orbit is nearly constant. And there's yet one more requirement that the orbit has to satisfy. Consider this in your imagination: There can't be an orbit where the satellite circulates over, say, a little 20-mile circle around the North Pole. A satellite orbit has to revolve around the "whole earth", which is a clunky way of saying that the center of the earth has to be in the plane of the orbit. The orbit can "incline" as much as you want ... the satellite can stay over the equator all the time, or swing from North pole to South pole and back again, but the center of the orbit always has to be at the center of the earth. Now you can see the final requirement for a communications satellite: If the orbit is inclined to the equator, then the satellite will appear to swing above and below its average location in the sky every 24 hours, which also makes it hard for a stationary antenna on the ground. The orbit has to be oriented at 'zero inclination', meaning it lies directly above the equator at every point. Now, finally, with a nearly circular, equatorial orbit, of exactly the right size, the satellite appears motionless in the sky, and all those little 18-inch TV dishes on the neighborhood rooftops can be pointed once at the satellite and never need to move. A satellite in this orbit is not only "geosynchronous" (24-hour orbital period), but also "geostationary" ... motionless relative to a point on the earth.

the gravitational force holds its atmosphere together

The gaseous layer that surrounds the Earth is called the atmosphere. It is composed of different gases, such as nitrogen, oxygen, and carbon dioxide, that are held in place by Earth's gravity. The atmosphere plays a crucial role in regulating the planet's temperature and protecting it from harmful radiation from the sun.

The four main layers of the atmosphere, based on temperature variations, are the troposphere, stratosphere, mesosphere, and thermosphere. The troposphere is closest to the Earth's surface and contains most of the atmosphere's water vapor and weather systems. The stratosphere contains the ozone layer, which helps protect the Earth from harmful UV radiation. The mesosphere is where most meteorites burn up upon entering the atmosphere, and the thermosphere is where temperatures can reach extremely high levels due to the absorption of solar radiation.

Nitrogen makes up most of the atmosphere. I am not sure which comes in second place, oxygen or carbon dioxide. I know our levels of carbon dioxide is rapidly increasing on this planet.

4.4 million years ago, the atmosphere likely consisted of gases such as nitrogen, carbon dioxide, methane, water vapor, and trace amounts of other gases. The composition may have been different from today due to ongoing geological and climatic processes.

The main layers of Earth's atmosphere, starting from the surface outward, are the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. Each layer has distinct characteristics and plays a role in regulating the planet's climate and environment.

A type of radar that continuously measures the wind, moisture, and temperature of the upper atmosphere is called a Doppler wind profiler. It works by emitting radio waves into the atmosphere and measuring the Doppler shift of the waves reflected off of particles in the air, allowing for calculations of wind speed and direction at different heights.

stratosphere
The atmospheric layer above the troposphere is the stratosphere. It extends to about 30-35 miles above the earth's surface, and is the most stable layer.

When water vapor condenses into liquid water, it changes from a gas to a liquid state due to a decrease in temperature. This process releases energy in the form of heat, known as the latent heat of condensation. Condensation is responsible for the formation of clouds and precipitation in the atmosphere.

The layer of the atmosphere where weather happens is the troposphere. It is the lowest layer of the atmosphere, extending from the Earth's surface up to about 10-15 kilometers in altitude. Within the troposphere, most of Earth's weather phenomena, such as clouds, precipitation, and storms, occur.

the most abundant gas of the atmosphere is nitrogen with high percentage 78.09

The layers of Earth's atmosphere are classified based on their temperature profile. The main difference lies in how the temperature changes with altitude in each layer, which leads to variations in air density and composition. The layers are named troposphere, stratosphere, mesosphere, thermosphere, and exosphere, with distinct characteristics and boundaries.

The anemometer measures wind speed, and the wind-vane measures its direction.

Those two measurements combine to indicate the wind velocity.

Wind force depends on the method and device used to capture wind-power, or the

shape and size of the structure against which the wind blows. For any single device

or structure, the force of the wind against it is closely related to the wind's speed

and direction.

The stratosphere is the atmospheric temperature zone located between 8 and 32 miles above Earth's surface that contains an abundance of ozone. Ozone absorbs and scatters ultraviolet solar radiation in this layer, which helps protect life on Earth from harmful UV rays.

A scrubber is a device used to remove pollutants or impurities from gases, liquids, or surfaces. In the context of air pollution control, scrubbers are commonly used to remove harmful chemicals and particles from industrial emissions before they are released into the atmosphere.

Burning fossil fuels for energy production, transportation, and industry is the largest human activity contributing to CO2 emissions in the atmosphere. Deforestation and land-use changes also release significant amounts of CO2.

Along with gases, the Earth's atmosphere also contains various particulate matter such as dust, pollen, soot, and aerosols. Additionally, water vapor, clouds, and precipitation are also some of the substances present in the atmosphere.

During a volcanic eruption, hot magma and gas propel rock fragments and ash into the air. These particles can reach high altitudes due to the explosive force of the eruption. Ash clouds can also be carried by wind over long distances.

Water moves through the hydrosphere through processes like evaporation, precipitation, and runoff. In the lithosphere, water can percolate through the soil and rocks to become groundwater. In the atmosphere, water evaporates from bodies of water, condenses to form clouds, and falls back to the surface as precipitation.

The bright streak of light is the meteoroid burning up in the atmosphere due to friction from its extreme velocity. If the meteoroid completely burns up, it is called a meteor; if part of it makes it to the ground, it is called a meteorite.

The ozone shield is located in the stratosphere, a layer of Earth's atmosphere. It is made up of ozone molecules that absorb and block harmful ultraviolet (UV) radiation from the sun.

Payload weight.

There is dust, pollen and spores from any number of plants, and a whole bunch of tiny solid material that has come from combustion. This includes stuff from vehicle exhausts, from incereration of all kinds of materials. (There are lots of Forrest fires and other fires that are intentionally set to clear land as well as all the fires around the world used for cooking and/or heating.) Things from the burning of coal, and from the burning of wood. A lot of other things from industrial processes (other than gases) are there as well.

The Ordovician Period had a warm and humid climate, with most landmasses clustered near the South Pole. The seas were filled with a diverse range of marine life, including early fish and invertebrates. The period ended with a mass extinction event that wiped out around 60% of marine genera.