optical depth

The optical depth of the smoke can be much greater than unity.

The normal optical depth of the dust bands is about 10 or less.

It had a normal optical depth of 10 or less and was extremely faint.

"Optical depth right now is about as high as it's ever measured."

Crucial to understanding limb darkening is the idea of optical depth.

This approximation makes the source function linear in optical depth.

Optical depth in astrophysics refers to a specific level of transparency.

The optical depth of the atmosphere can be measured with a sun photometer.

The optical depth at the photosphere turns out to be .

Tropospheric aerosol optical depth ranged from about 0.1 to 0.7.

Far infrared radiation penetrates deeply due to the low optical depth.

One way of visualizing optical depth is to think of a fog.

Optical depth, or optical thickness, is a measure of transparency.

The fog between a person and an object that is immediately in front of them has an optical depth of zero.

Visible optical depths greater than 0.2 were observed during flight segments flown above the tropopause.

It shows significant unexplained azimuthal variations in normal optical depth and width.

In contrast, the dust bands have relatively few large particles, which results in low optical depth.

Optical depth to the astrophysicist is essentially an analogue for physical depth.

Where is the effective temperature at that depth and is the optical depth.

Tau in astronomy is a measure of optical depth, or how much sunlight cannot penetrate the atmosphere.

Thus, by definition, the optical depth of the stellar surface, also called the photosphere, is:

Another closely related concept is optical depth.

The first moment of the mean intensity is constant regardless of optical depth:

It extends into a star's surface until the plasma becomes opaque, equivalent to an optical depth of approximately 2/3.

For atmospheric science applications, it is useful to introduce the quantity of optical depth .