Pätevä peli tämä IRST = Infra-red search and track
The higher the altitude, the less dense the atmosphere and the less infrared radiation it absorbs - especially at longer wavelengths. The effect of reduction in friction between air and aircraft does not compensate the better transmission of infrared radiation. Therefore, infrared detection ranges are longer at high altitudes.
At high altitudes, temperatures range from -30 to -50°C - which provide better contrast between aircraft temperature and background temperature.
The Eurofighter Typhoon's PIRATE IRST can detect subsonic fighters from 90 km from front and 145 km from rear
[14] - the increase being the consequence of directly observing the engine exhaust, with an even greater increase being possible if the target uses
afterburners.
The range at which where a target can be sufficiently confidently identified to decide on weapon release is significantly inferior to the detection range - manufacturers have claimed it is about 65% of detection range.