Observed characteristics of sudden commencement absorption |
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| Authors: | S.E. Ritchie F. Honary |
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| Affiliation: | 1. Commission for Communications Regulation (ComReg), Irish Life Centre, Lower Abbey Street, Dublin 2, Ireland;2. Department of Communication Systems, University of Lancaster, Lancaster LA1 4W4, UK;1. Qian Xuesen Laboratory of Space Technology, China Academy of Space Technology, Beijing 100094, China;2. State Key Laboratory of Geodesy and Earth’s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China;3. College of Science, Wuhan University of Science and Technology, Wuhan 430081, China;1. Instituto Federal de Educação, Ciência e Tecnologia de Mato Grosso – IFMT, Brazil;2. Centro de Recursos Naturais e Ambiente (CERENA), Instituto Superior Técnico – IST, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;3. Universidade Estadual Paulista, Faculdade de Ciências e Tecnologia – FCT, 305 Roberto Simonsen, 19060-900 Presidente Prudente, Brazil;1. Space Exploration Institute, 68 Faubourg de l’Hôpital, CH-2002 Neuchâtel, Switzerland;2. Université de Toulouse, Observatoire Midi-Pyrénées, UPS-OMP, IRAP, Toulouse, France;3. CNRS, IRAP, 14, Avenue Edouard Belin, F-31400 Toulouse, France;4. ESA/ESTEC, Kepleerlan 1, 2200 AG Noordwijk, The Netherlands;5. ISAS, JAXA, Yoshinodai 3-1-1, Chuo-ku, Sagamihara City, Kanagawa 252-5210, Japan;1. Department of Astronomy, Boston University, 725 Commonwealth Avenue, Boston, MA 02215, USA;2. Center for Space Physics, Boston University, 725 Commonwealth Avenue, Boston, MA 02215, USA |
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| Abstract: | Ionospheric absorption at high latitudes that occurs coincidently with storm sudden commencements (SSC) is categorised as sudden commencement absorption (SCA). Having discounted any solar activity effects on the measurement of SCA this paper describes, for the first time, the basic characteristics of SCA measured over half a solar cycle.It is revealed that the measurement of SCA is not affected by Solar activity, the local time of occurrence of the SSC or the direction of Bz immediately before or after the SSC event. We also show that the median value of expected SCA is best predicted by the step change in IMF magnetic field coincident with the SSC event. This strong correlation between the median value of SCA and the IMF magnitude that occurred during the shock has been formulated to aid propagation prediction. |
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