Starting models for the real height analysis of ionograms |
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| Institution: | 1. Translational Medical Center for Development and Disease, Institute of Pediatrics, Shanghai Key Laboratory of Birth Defect, Children''s Hospital of Fudan University, 399 Wanyuan Road, Shanghai 201102, China;2. Center for Chinese Medical Therapy and Systems Biology, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai 201203, China;3. Department of Pathophysiology, School of Basic Medicine, Key Laboratory of Neurological Diseases, Ministry of Education, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China;4. Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders, Ministry of Education, Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai 200030, China |
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| Abstract: | Procedures are described for use in the real height analysis of ionogram data using the ordinary ray only, to allow for the presence of underlying (low density) ionisation. A controlled extrapolation of the virtual heights, with upper and lower limits, gives some useful correction under most conditions. For more accurate and consistent results a synoptic model is used to give a mean starting height at a fixed frequency of 0.5 MHz. Constraints are placed on the profile shape between 0.5 MHz and the lowest observed frequency 1, to minimise the variations with different methods of analysis and different values of 1. Suitable model starting heights are described for day and night conditions, and presented in tabular and graphical form. Equations are also given from which the model starting height can be calculated directly as a function of the local time, the month and the station latitude. |
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