Abstract
Several campaigns of ionospheric vertical soundings with short-time interval between them (HRIS) have been recently performed at the ionospheric station in Rome. Some preliminary results concerning periods around local sunrise are presented. A cIear fading effect, due to the defocusing phenomena in the upper ionosphere, has been observed in different seasons
Keywords
atmospheric gravity waves;travelling ionospheric disturbances
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DOI: https://doi.org/10.4401/ag-4235
Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X