A study of ionospheric absorption events at very high latitudes

• Published in: Journal of Atmospheric and Terrestrial Physics
• Main Authors: Vassal, J., Berthelier, Jean-Jacques, Lavergnat, J., Sylvain, M.
• Other Authors: Laboratoire de Géophysique Externe, Centre National de la Recherche Scientifique (CNRS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 1976
• Subjects: [PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]; Dumont d'Urville; Dumont d'Urville Station; Dumont-d'Urville; Antarc*; Antarctica
• Online Access: https://hal.archives-ouvertes.fr/hal-03225718; https://doi.org/10.1016/0021-9169(76)90137-9

International audience Riometer recordings at Dumont d'Urville station (Antarctica) show very often absorption events characterized by an irregular and slowly varying absorption of about 0.2 to 1 dB.Analysis of these data and of simultaneous ionograms allows the separation of these events into three homogenous populations, one of which is associated with F-lacuna, i.e. the disappearance on the ionograms of all or part of echoes from the F-region.This paper describes the method of separation of these populations and describe the properties of occurrence of each of them.