The Great Globe Gallery


Solar Terrestrial Dispatch
Space Weather and Radio Propagation Forecasting


This is a map showing the altitude where the electron density reaches a maximum. The contours are labelled in km above the surface of the Earth.


This map is a map showing how geomagnetic latitude maps onto geographic coordinates. Using this map, you can determine what your geomagnetic latitude is.


These images are near realtime visible (VIS) and ultraviolet (UVI) images of the northern polar auroral oval, taken by the POLAR spacecraft.


The above map shows a position of the auroral oval as determined by the polar orbiting Defense Meteorological Satellite Program (DMSP) satellites. The green oval defines the approximate shape of the diffuse auroral oval as determined by the electron precipitation sensors on-board the DMSP spacecraft. The approximate location of the solar terminator at an altitude of 110 km (the height at which the lower-altitude auroral lumination occurs) is shown by the gray line. All stations reporting activity during the current UTC day are plotted as white dots.


This map is a high-resolution global map of F2-layer critical frequencies. This corresponds to the maximum radio frequency that can be reflected by the F2-region of the ionosphere at vertical incidence (that is, when the signal is transmitted straight up into the ionosphere). It is also a map showing the current location of the auroral ovals, the sunrise/sunset terminator and the regions of the world where the sun is 12 degrees below the horizon (which estimates the gray-line corridor where HF propagation is usually enhanced).


This map is a high-resolution global map of Solar Zenith Angles, or angles indicating the elevation of the Sun above the horizon (in degrees).


This map is a global map indicating the altitude above the surface of the Earth where the ionospheric electron density reaches a maximum. It is also a map showing the current location of the auroral ovals, the sunrise/sunset terminator and the regions of the world where the sun is 12 degrees below the horizon (which estimates the gray-line corridor where HF propagation is usually enhanced).