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Manuscript Title: A program for the simulation and analysis of open atmospheric balloon soundings.
Authors: P. Alexander, A. de la Torre
Program title: Balloon
Catalogue identifier: ADRA_v1_0
Distribution format: zip
Journal reference: Comput. Phys. Commun. 151(2003)96
Programming language: Fortran.
Computer: 1.2 GHz, 256 MB PC.
Operating system: Windows ME.
Keywords: Balloon dynamics, Coupled integrodifferential equations, Runge-Kutta, Atmosphere.
Classification: 13.

Nature of problem:
A version of the balloon equation of motion in an atmosphere that contemplates features not considered in previous works is presented. A coupled integrodifferential set results in the most general case. Numerical solutions become necessary to describe balloon dynamics but in a few simple cases. This work is intended for previous simulations of soundings, postflight analysis or general study of open balloon dynamics.

Solution method:
Depending on the conditions of the problem to be studied, an integral term of the balloon equation of motion has to be included or excluded and respectively a fourth or fifth order Runge-Kutta method has been implemented to find solutions. Notwithstanding the integrodifferential nature of the problem, the procedure does not require iterations, implying a significant run time saving.

Restrictions:
Two-dimensional solutions are found.

Running time:
The program takes about 1 second without the history term, but when it is included there is an increase by orders of magnitude according to the demanded time step and tolerance for the run.