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...The intensities of these signals reflect the ability of radio waves at those wavelengths to propagate in what is essentially a waveguide formed by the earth and the ionosphere above it. Fluctuations in those signal intensities and directions often reflect daytime perturbations of the ionosphere by solar processes, such as solar flares and coronal mass ejections, making VLF receivers useful tools for probing the sun and the earth's ionosphere. For additional general information, see the web page at http://solar-center.stanford.edu/SID/.

Small Qt/Qwt program to display an analemma diagram of the sun. This is the curve representing the sun's angular height above the horizon. The program shows one curve per full hour (the real analemma) and one for every first day of a month.

This project is no longer under active development. It has been superceded by the alignment subsystem which is now part of the main INDI project. This project provides an "alignment layer" driver to sit above INDI telescope drivers. This layer performs transformation services for telescope coordinates as they pass up and down to the underlying driver. The conversion matrices are computed from alignment datums passed down into the alignment layer. The N point alignment model can be used for both equatorial and alt azimuth mounts. The alignment database and coordinate conversion functionality is isolated in a separate class library module which can also be used to provide this functionality directly to INDI telescope drivers.