The diurnal,annual and sunspot-cycle variations of ESFm at Huancayo compared with similar variations of spread-F occurrence at other longitudes and latitudes |
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| Authors: | GG Bowman IK Mortimer |
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| Institution: | 1. College of Biological and Environmental Sciences, Zhejiang Wanli University, Ningbo 315100, PR China;2. Korean Bioinformation Center (KOBIC), Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806, Republic of Korea;3. Department of Bioinformatics, University of Sciences and Technology, Daejeon 305-350, Republic of Korea;4. Department of Dermatology, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul 135-710, Republic of Korea;5. Zhejiang Provincial Key Laboratory of Applied Enzymology, Yangtze Delta Region Institute of Tsinghua University, Jiaxing 314006, PR China;1. College of Biological and Environmental Sciences, Zhejiang Wanli University, Ningbo 315100, PR China;2. Zhejiang Provincial Key Laboratory of Applied Enzymology, Yangtze Delta Region Institute of Tsinghua University, Jiaxing 314006, PR China;3. Department of Dermatology, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul 135-710, Republic of Korea;1. Fisheries and Oceans Canada, Gulf Fisheries Center, PO Box 5030, Moncton, N.B. E1C 9B6, Canada;2. Fisheries and Oceans Canada, Bedford Institute of Oceanography, PO Box 1006, Dartmouth, N.S. B2Y 4A2, Canada;3. IFREMER, Laboratoire Ressources Halieutiques, 150 Quai Gambetta, BP 699 62321 Boulogne sur Mer, France;1. University of New Hampshire, Center for Coastal and Ocean Mapping, 24 Colovos Road, Durham, NH, 03824, USA;2. National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Alaska Fisheries Science Center, 7600 Sand Point Way NE, Seattle, WA, 98115, USA |
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| Abstract: | Using the tabulations of spread-F data from ionosonde recordings the diurnal, annual and sunspot-cycle variations of this spread-F occurrence have been investigated for the equatorial station, Huancayo. Both Rz max and Rz min periods have been considered. The analyses suggest that some explanation of these variations can be made by involving two regimes, which have been called Regime A and Regime B. The Regime A is present throughout the night but this distribution is more obvious after midnight. This is because in the post-sunset period Regime B, which is associated with significant height rises, is dominant. The Regime A is the same as for similar distributions in mid-latitudes and is inversely related to sunspot activity. It maximizes in December solstice months. The Regime B is directly related to sunspot activity and maximizes in equinoctial months. Changes associated with the upper atmosphere neutral particle density have been found to be important, particularly for Regime A where an inverse relationship exists. The Regime A Rz min annual distributions reported here for Huancayo have been compared with similar distributions at other longitudes and latitudes. |
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