Attention Deficit Disorder Prosthetic Memory Program

Heat Haze

ADDPMP458
Heat Haze - © Attention Deficit Disorder Prosthetic Memory Program

Heat haze, also called heat shimmer, refers to the inferior mirage observed when viewing objects through a mass of heated air. Common instances when heat haze occurs include images of objects viewed across asphalt concrete (also known as tarmac) roads and over masonry rooftops on hot days, above and behind fire (as in burning candles, patio heaters, and campfires), and through exhaust gases from jet engines. When appearing on roads due to the hot asphalt, it is often referred to as a “highway mirage”.

Convection causes the temperature of the air to vary, and the variation between the hot air at the surface of the road and the denser cool air above it creates a gradient in the refractive index of the air. This produces a blurred shimmering effect, which hinders the ability to resolve the image and increases when the image is magnified through a telescope or telephoto lens.

Light from the sky at a shallow angle to the road is refracted by the index gradient, making it appear as if the sky is reflected by the road’s surface. The mind interprets this as a pool of water on the road, since water also reflects the sky. The illusion fades as the observer approaches the miraged object.

On tarmac roads, it may appear as if water, or even oil, has been spilled. This kind of inferior mirage is often called a “desert mirage” or “highway mirage”. Both sand and tarmac can become very hot when exposed to the sun, easily being more than 10 °C (18 °F) higher than the air a meter above, enough to make conditions suitable to cause the mirage.

Heat haze is not related to the atmospheric phenomenon of haze.

Gates Of Hell - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP428
Gates Of Hell
Buzkashi - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP350
Buzkashi
Apeirophobia - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP468
Apeirophobia
Oregon Highway 18 Smiley Face - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP300
Oregon Highway 18 Smiley Face
Maratus Spider - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP259
Maratus Spider
Roundabout Public Art - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP366
Roundabout Public Art
Stendhal Syndrome - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP369
Stendhal Syndrome
The Anthropocene Era - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP073
The Anthropocene Era
La Guardia Committee - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP570
La Guardia Committee
Ballistic Gelatin - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP185
Ballistic Gelatin
Alain Robert - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP442
Alain Robert
The Music of the Spheres - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP131
The Music of the Spheres

You are using an outdated browser.
Please upgrade your browser to improve your experience.