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Forrest L. Staffanson

Abstract

A mathematical model is developed for the film-mounted thermistor bead temperature sensor used in current meteorological rocketsondes. Thermometric correction formulas are given suited to programming for automatic data processing. The development treats the convection, radiation, electric heating and dynamic lag of the thermistor bead, along with the convective, radiative and conductive behavior of its supporting electric wires and film. The effects are combined according to conductive coupling. Basic expressions are included for special cases of long, short and insulated wires, and analogous cases in the film. The model is generally applicable when the wire and film are sufficiently thin. A numerical example based on the White Sands Missile Range STS-1 sensor establishes the film as the dominant element in sensing air temperatures above the stratopause.

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Forrest L. Staffanson, Shigetaka Kikkawa, and R. Gary Phibbs

Abstract

A comprehensive digital computer program is described which automatically processes precision digitized data from conventional rocketsondes and radars to produce accurately corrected temperatures and winds together with estimated uncertainties at each point. Underlying models for the systematic errors in the Arcasonde 1A temperature sensor and the radar-tracked parachute wind sensor, and for the uncertainty in corrected results are presented. Techniques used to automatically edit, synchronize and filter data are also given. Performance is illustrated by graphical output from the eight meteorological soundings in the rocket series conducted at Wallops Island, Va., during the 7 March 1970 solar eclipse. An operational version (METROK) of the program is in use at NASA Wallops Station.

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