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We investigate the response of the high-latitude topside ionosphere to large geomagnetic storms. For our study we employ electron-density profiles, derived from the Alouette and ISIS topside sounder satellites, available from http://nssdc.gsfc.nasa.gov/space/isis/isis-status.html which also describes a recent data restoration project that will enable this work to be expanded [1,2]. The focus is on...
Ionospheric topside sounders stimulate a wide variety of signal returns, which have been labeled plasma resonances, including two sequences that appear between the harmonics of the electron cyclotron frequency fce. One, known as the Qn sequence, occurs above the upper-hybrid frequency fuh, where fuh2 = fce2 + fpe2 and fpe is the electron plasma frequency; this sequence has been attributed to slowly-propagating...
The Alouette and ISIS topside sounder satellites recorded a great wealth of information about the topside ionosphere during their long period of operations from 1962 to 1990. So much though that only a small percentage was analyzed during the mission life time. A data restoration effort first digitized the analog data and then developed the TOPIST software for automated inversion of the ionograms...
The goal of the Virtual Wave Observatory (VWO) is to provide user-friendly access to heliophysics wave data [1]. While the VWO initially emphasized the vast quantity of wave data obtained from passive receivers, the VWO infrastructure can also be used to access active sounder data sets. Here we demonstrate the application of the VWO capabilities to data from the Alouette/ISIS topside sounders. The...
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