High up · aeronautic

The same fighter and program, from sea level to 15 km: the thinner air burns, slows and drops them differently.

countermeasures-altitude.tsx

Starting…

import type { FC } from "react";
import { CountermeasuresExample } from "./countermeasures";

/**
 * The docs' fighter letting flares and chaff go high up, the altitude its
 * to change.
 * @returns The example
 */
export const CountermeasuresAltitudeExample: FC = () => (
  <CountermeasuresExample start={{ altitude_m: 12_000 }} altitude />
);

export default CountermeasuresAltitudeExample;

The night example, twelve kilometres up, and the altitude yours to change. Everything that changes with it comes from the standard atmosphere's pressure, temperature and density there:

altitude	burns for	falls at, slowed	at the grain as thrown at 250 m/s	chaff sinks at
0 m	2.9 s	28 m/s	92 kcd	0.18 m/s
6 km	3.2 s	39 m/s	129 kcd	0.22 m/s
12 km	3.4 s	56 m/s	172 kcd	0.28 m/s
15 km	3.6 s	71 m/s	194 kcd	0.31 m/s

It burns longer in thinner air: MTV's burn rate goes with the pressure to the 0.094.
It falls faster once slowed, its drag going with the air's density, and is slowed less: higher up a program's flares stream further back.
The airstream strips less off the flame at the same airspeed, so it dims less as it leaves: an estimate, as on the night page.
Chaff sinks faster, Lamb's drag on each fibre falling with the air's density, and its fibres lie a little further from level.