atmospheric density

atmospheric density

[¦at·mə¦sfir·ik ′den·səd·ē]
(meteorology)
The ratio of the mass of a portion of the atmosphere to the volume it occupies.
References in classic literature ?
"It was a purely scientific research party sent out by my father's father, the Jeddak of Helium, to rechart the air currents, and to take atmospheric density tests," replied the fair prisoner, in a low, well-modulated voice.
The team determined that the atmospheric density -- basically, the number of molecules (of oxygen) in a given volume of air -- experienced by the bug-sized heroes is reduced to a level nearly identical to that of Mt.
In the no heat transfer case, intake air density was found to be approximately 35% higher than atmospheric density. To a first order approximation (assuming volume of fuel that can be burned is proportional to the volume of air in the cylinder), this increase in density would correspond to a 35% increase in engine power, compared to natural aspiration.
To make it fly at that low atmospheric density, we had to scrutinize everything--make it as light as possible while being as strong and as powerful as it can possibly be."
There are also ESA's three Swarm satellites (earth.esa.int/web/guest/missions/esa-operational-eo-missions/ swarm) that I'm currently using for space weather research, mainly for measuring auroral currents and atmospheric density.
It can also broadcast signals from various satellites, determine their locations and measure atmospheric density through orbital analysis.
The atmosphere of Mars is only one percent that of Earth, so when our helicopter is on the Martian surface, it's already at the Earth equivalent of 100,000 feet up," Mimi Aung, Mars Helicopter project manager at JPL, said in a (http://www.nasa.gov/press-release/mars-helicopter-to-fly-on-nasa-s-next-red-planet-rover-mission) statement . "To make it fly at that low atmospheric density, we had to scrutinize everything, make it as light as possible while being as strong and as powerful as it can possibly be."
One important effect is on atmospheric density and thus space operations.
It relies on the accuracy of the atmospheric density model, and its computational complexity is very high which limits its application.
The perturbing acceleration due to drag, [[??].sub.drag], depends on the spacecraft's drag coefficient, [C.sub.d], area-to-mass ratio, A/m, velocity with respect to the atmosphere, v, and the atmospheric density, p:
Novel techniques capable of remotely determining atmospheric composition, surface atmospheric density and oceanic coverage could therefore be useful in augmenting future exoplanetary searches.
where [[rho].sub.0] is the atmospheric density at sea level, and [H.sub.n] is the Laplace harmonic of degree n for the topographic height.

Full browser ?