The Helioviewer project is an online Solar and heliospheric image visualization tool. It is the result of a cooperation between NASA, ESA, and JAXA.
The aim of the Helioviewer Project is to enable exploration of the Sun and the inner heliosphere for everyone, everywhere via intuitive interfaces and novel technology. It's a suite of (mostly) open technologies designed to make populous archives of large images and related data and metadata available over the web, via intuitive interfaces. It grew out of solar physics, where there is a need to be able to visualize large numbers of heterogeneous data-sets that observe phenomena in the inner heliosphere. The interfaces we have developed are designed to let users overlay multiple data-sets and enable exploration on user-defined time-scales and length-scales.
It is consisting of an online tool at Helioviewer.org and its sister application JHelioviewer.