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The example trajectories shown on these pages were
generated by integration of the wind field at the ever-changing
balloon location. The integration scheme is simple and
1st-order: y(t1) = y(t0) + x(t0)*[(dy/dx)(t0)]. The
time step for the integration is set to a constant 1.0
hours, and the balloon altitude remains fixed at 35
km (geopotential), or about 5 hPa.
The example trajectories displayed herein are not forecast
trajectories, i.e. they were not developed from atmospheric
forecasts. They were developed using four-dimensional
interpolation of atmospheric analyses.
The current version of the TrajSim software provides
the option to save the status of the display at any
time in the simulation. Several plot time increments
and simulation speeds are available as viewing options.
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