Abstract
At auroral latitudes localized sources with different structures generate disturbances which can propagate over the entire Earth. The sources are maintained by the plasma flow from the magnetosphere and can be measured in situ and/or remotely. To a certain extent the traveling wave disturbances that are generated can be detected by sounding the ionosphere even at locations far from the auroral regions. It is well known that the shadow of the moon during a solar eclipse generates localized disturbances, which can have effects similar to those of sources in the auroral regions. Software tools and object classes have been developed at IRF-Kiruna to allow data, that have been received as ionosonde soundings at several places and related times to be visualized as time varying discrete dynamic stereograms. Two aspects of the software development are stressed: 1) use of interactive manipulation and visualization of stereograms, which are animations of collections of discrete 3-D point sets that are dependent on several real parameters, and 2) use of an object-oriented method that is transparent to the user and enables more direct visualization of multidimensional data. An introduction to dynamic stereoscopic display of data is given using an example of visualizing the shape of a moving sphere or spherical cloud of points.
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