This webpage is based on the simplest GISM functionality : the point to point calculation. It computes the ionospheric effects on a signal transmitted between two user defined points. Please contact us for any information about the full version of GISM.

Frequency (MHz) :

Solar flux :

Receiver latitude (deg) : longitude (deg) : altitude (m) :

Transmitter latitude (deg) : longitude (deg) : altitude (m) :

Date (dd/mm/yyyy) : universal time (hh:mm) :