Thermal Patterns in the Landscape Recorded with Infrared Technique and Simulated in Model Experiments

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Abstract
Under certain conditions when the weather is windy marked thermal patterns in connection with pronounced hindrances for the air flow are found in infrared images recorded over open terrain. In this paper some effects of this kind have been described, and an attempt to interpret the genesis of the phenomena has also been made. Areas with funnel effects and side bands, windward and leeward areas with extreme temperature conditions and also a striation in the grey tones of the images parallel to the wind direction have thus been found to exist in several places in the infrared images. Further some model experiments have been performed with the aid of a simple apparatus. By means of this it has been possible to reproduce in the laboratory effects similar to some of those mentioned. This has facilitated the interpretation of the phenomena. Some of the effects—side bands and windward areas with extreme thermal conditions—were noticed in the aerial infrared images only after the effects had been found in the model experiments.

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