Questions tagged [atmospheric-science]

The study of the composition or dynamics of the gaseous layers around planets, often applied to questions on Earth's atmosphere but can be applicable to all planets & moons in the solar system.

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912 views

How is the space vacuum not strong enough to pull the atmosphere off? [duplicate]

This isn't a duplicate, but I couldn't respond here: Why is space a vacuum? Also, why doesn't air from the Earth escape into space? Someone said "space isn't that kind of vacuum" and "it doesn't ...
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2answers
583 views

How is there still gas in the atmosphere?

The speed of molecules in the atmosphere vary, and can exceed the escape velocity of the earth, $11\:\mathrm{km\:s^{-1}}$ If this happens, and has been happening for millions of years, how hasn't all ...
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1answer
70 views

Can a blimp skip on the atmosphere?

What would happen if a large blimp slowing from an orbital speed skims the atmosphere gradually? Would a proper angle allow it to skip like a rock to water over until it slows with each dip? Would ...
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1answer
335 views

Does aerosol particulate matter attenuate UVA more as compared to UVB?

I am trying to understand if winter aerosol particulate matter has a greater impact on UVB radiation as compared to UVA radiation. Would the attenuation be mainly due to scattering? I am asking this ...
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1answer
2k views

Why are light-bulbs filled with low pressure gas?

When incandescent light bulbs are manufactured, they are filled with an inert gas to insulate the filament and prevent its sublimation. The pressure inside a freshly manufactured light bulb is ...
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2answers
231 views

Why does atmospheric pressure doesn't seem to affect day to day objects?

Even though the atmospheric pressure is acting on our body, it doesn't get crushed because an equal amount of pressure is exerted by our body to balance it. But an ordinary object also experiences ...
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1answer
559 views

Does aeroplane moving against Earth's rotation cause relative wind (assuming otherwise a quiet weather outside)?

Although, I know some answers, I need more affirmative and accurate answers. Why is the journey time from London to Singapore less compared to Singapore to London? Is it because of Earth's rotation ...
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2answers
184 views

Why fog and water have such a good relationship

Today in the morning, I was in the bus and when the bus was on a flyover (which was built on a river) I saw an interesting thing. There was a lot of fog there, so much that it was impossible to see ...
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1answer
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Why are neutrons preferred for measuring cosmic flux (Forbush decreases)?

I see (I asked this question, today read Wikipedia's article on 'neutron monitor', and other stuff, they're always neutrons) that neutrons are the favourite secondary cosmic ray when studying Forbush ...
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88 views

Clouds and gravity [duplicate]

If a cloud is a kilometer long and a kilometer tall and weighs about as much as 100 elephants, why it does not fall to the ground under the influence of gravity?
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143 views

Paleoclimatic evidence for cause effect relationship between CO2 and temprature

The Ice core data was famously used to by Al Gore in his documentary "An inconvenient truth" to imply a relation between cause effect relation between CO2 and Temperature. This paper and others ...
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1answer
5k views

Are there any planets without atmospheres? [closed]

Just after observing a cold response on my previous question i m asking this question in a completely different way(as my knowledge about atmospheres has developed). My question is that are there ...
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1answer
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What would happen if a large body of liquid were to fall from space?

Much like how meteors enter our atmosphere all the time, what would happen if a large body of a liquid were to enter our atmosphere, and make it to the ground? If a meteor were to hit the ground, it ...
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1answer
582 views

Air column pressure distribution in the atmosphere for high/low ground pressure

I cannot figure out how to imagine the high and low (ground level) pressure effect on the rest of the atmosphere. How is the air column distribution different from a mean pressure? "Areas of high and ...
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Is a Niven ring in the atmosphere of Uranus stable? [closed]

For my science fiction universe, I need to mine a lot of Deuterium and Helium-3. I have 10,000 intake fans each capable of 3,000 gigaliters an hour pushing atmosphere through 5 billion diffusers. ...
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1answer
428 views

How does the 11-year solar cycle alter the cosmic ray flux?

Looking at a flux vs. time graph of secondary cosmic rays (e.g. from a neutron station: www.nmdb.eu/nest/search.php can plot you some. I just tried for example Moscow, from 14 Oct 1951 to today, ...
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Global warming: change in Earth's potential energy

It is quite common to hear in newspapers and television about the increasing temperature, i.e. global warming. But I am interested in something else. How does global warming affect the internal ...
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2answers
591 views

What would happen to Earth's atmosphere if the force of gravity became slightly weaker?

Many people, myself included, have wondered if the human race should be worried about the sun exploding at some point in our future (it seems to be well established that we shouldn't be worried.) On a ...
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1answer
752 views

Why can't infrared rays go through the atmosphere?

Why can't infrared rays reach the earth? Why can't they pass through the atmosphere?
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Why is the sky never green?But it can be slightly blue-green? [duplicate]

The colour of the sky is determined by light scattered from the sun reaching the earth from a new direction. The shorter the wavelength the greater the light is scattered. On a dull day, with the sun ...
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4answers
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Rainbow in cloud near Sun

Recently, it was a fine sunny morning (around 100 minutes after sunrise) and the sun was briefly behind a small cloud. Near the sun was one of those wispy clouds one sometimes sees (possibly Cirrus ...
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0answers
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Double Slit Experiment With Air

I can see interference patterns in liquids and in light, but I don't see it in the air that surrounds us. I don't see leaves align in an interference pattern on the other side of a picket fence. The ...
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Minimum velocity required to “skip” a spacecraft across the atmosphere?

When, hopefully, Virgin Galactic spacecraft start regular operations in a few years time, they will be simply travelling upwards, then achieving weightlessness for a short while, followed by a ...
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2answers
119 views

Is speed of Hot air rising gravity dependent?

Would say a heated air rise twice as fast in 2G than in the environment with standard Earth gravity?
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1answer
318 views

Laser beam max distance at 30000 ft

would the max the distance covered by a green pointer at 30000 feet above ground level be much greater than same laser pointed on earth surface? for example if the manufacturer claims max distance of ...
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132 views

Extremum principle for gradient wind balance

Dear Physics StackExchange, as is well known, analytic solutions of the Navier-Stokes equations are only available for very special flows. Therefore, in most fields concerned with fluid dynamics, a ...
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1answer
722 views

What is meant by the “cosine corrected response” of a pyranometer?

I have done an experiment that involved placing a pyranometer on a flat area and measuring the solar irradiance. The pyranometer used was a Kipp & Zonen CMP3 The irradiance1 is proportional to $\...
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1answer
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$\ CO_2$ is heavier than oxygen and nitrogen still it does not form the lower layer of atmosphere

While studying I came across this question: Carbon dioxide is heavier than oxygen and nitrogen still it does not form the lower layer of atmosphere. Why? The only reason I feel this doesn't ...
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2answers
639 views

Similarities between light and other frequencies of EM waves

This may be a ridiculous question, but I'll learn something from it! Let's say there's a TV transmitter transmitting at 100kW. I can receive the station just fine 20 miles away. The antenna is 300m ...
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1answer
587 views

Why do clouds generally look flat at the bottom?

Clouds on a still summers day generally look flat at the bottom and fluffy on top. Why? I was asked the question a couple of days ago and he ventured that it had something to do with the density ...
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2answers
743 views

Orange sky 3.7 billion years ago because there was little oxygen?

PhysOrg quotes Martin VanKranendonk of the University of New South Wales and director of the Australian Center for Astrobiology: Because the atmosphere had very little oxygen and oxygen is what ...
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Nuclear Explosion Confined by Gravity?

When a nuclear device is detonated at ground level, we see the familiar mushroom cloud, which is undoubtedly caused by the weight of the atmosphere suppressing the upward thrust, causing the debris ...
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1answer
122 views

From which direction does air fill up space?

When a solid object moves in the atmosphere (e.g. a plane), in which direction does air fill up the "empty space" left by the translation of the object? Does this depends on the direction of ...
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0answers
319 views

What is the temperature of the clear day sky from the surface of Earth?

I read this thread: What is the temperature of the clear night sky from the surface of Earth? I don't know if this equation is also valid for day time. I don't think it is. I suppose the temperature ...
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2answers
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Why is the eye of a cyclone a forced vortex?

As far as I understand, a forced vortex has a velocity profile $u \propto r$ ($r$ is radial distance from centre of vortex), concluding at some outer boundary $r=R$ to avoid fluid particles ...
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1answer
319 views

Measuring the irradiance due to solar radiation with a pyranometer

Background information I carried out an experiment where a pyranometer (on a flat surface) was used to measure the irradiance at the ground due to solar radiation over a range of solar zenith angles (...
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2answers
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What is the main mechanism that heats air in the atmosphere?

During a sunny day, air is obviously hotter than at night. What is the main mechanism for this heating? I can think of three ways: Conduction: the air gets heated by the ground, which is warm. ...
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1answer
121 views

Why do clouds appear pinkish after rain?

Monsoon winds are blowing over India and after every rain I observe that the clouds are turning pinkish, even during the night. What causes such a phenomena? Or are the observations coincidence?
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Is this a plausible (scientifically, not technologically or economically) way of entering space?

Can a craft enter space purely by riding on the atmospheric pressure created below it? Recently there has been a lot of hype surrounding hyperloop and about how it is a revolutionary transportation ...
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1answer
77 views

What happens if a body jumps in the Moon? [duplicate]

I need to know why on Earth (ha ha..!) this behaviour happens when a body jumps in the Moon (a celestial body without any atmosphere at all). Video explanation: https://youtu.be/Qgs5E5gKO48 The ...
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2answers
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Why does atmospheric water vapor need dust particles to fall as rain?

I appreciate that rain can fall due to the process of coalescence described below, but I was under the impression that nucleation based around atmospheric dust particles was a vital part of the ...
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1answer
77 views

In fluid dynamics does $u_x-v_y$ have a name?

I have come across the quantity: $$\frac{\partial u}{\partial x}-\frac{\partial v}{\partial y}$$ of the two dimensional velocity field $(u,v)$. Does this quantity have a name or is it related to any ...
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2answers
738 views

How is 'Fog' in summer (sea-elevation) possible? [closed]

I am residing in New Delhi (pardon me for any irrelevant data I might include), and I noticed a really interesting thing. It's an average $30^{\circ}\mathrm{C}$ out here, and yet, most/some weather ...
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1answer
105 views

What conditions are necessary for Birkeland currents to form?

If charged particles flow through non-magnetised space will they form Birkeland current? Or can such currents only form along existing magnetic field lines? Part of the reason I ask is this: http://...
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3answers
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Temperature distribution in a column of air

Say there is a sealed cylinder of air that has a height $\mathrm{h}$ and area $\mathrm{A}$ on the ends. The initial temperature throughout the column is $T_0$ and has a uniform initial density $\rho_0$...
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3answers
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Why is there less UV light on earth in winter

So I have often read that, at least in e.g. northern Europe, in the colder seasons, there is not enough UV (-B) light arriving from the sun, so many people have not enough vitamin-D from that. At ...
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3answers
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How high do you need to be so as to not rotate along with Earth?

So, I saw this meme about some minister commenting that the Earth doesn't rotate, for if it did then planes only need to be in the air and the destination city would come to it. I know this is absurd ...
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1answer
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Can an object take off from A, do not move (in the air) but land at a different place? [closed]

Can an object take off at a point A on the surface of the Earth and then land after some time only to land at a different place where it initially took off (because in the mean time the Earth has ...
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2answers
208 views

Are clouds forming above a certain height? [closed]

Are clouds forming above a certain height (300m+) and if they do, how are they staying above that certain height and aren't forming let's say at 20-30m from ground. What keeps them so high?
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How to correctly calculate the colour of the sky?

It is well-known that the sky is blue due to Rayleigh-scattering. What bothers me though is the question how to actually calculate the spectrum of the scattered sunlight. Yes, use one of the formulas ...