Solar cycle variation in the total electron content at Sagamore Hill |
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| Affiliation: | 1. Institute of Systems Engineering, College of Management and Economics, Tianjin University, Tianjin 300072, China;2. Institute for Transport Studies, University of Leeds, UK;1. Medical University of South Carolina, 171 Ashley Avenue, Charleston, SC 29425, United States;2. VA Medical Center, 114 Doughty Street, Charleston, SC 29425, United States;3. Comparative Medicine Branch, NIEHS, PO Box 12333, MD-C1-05, Research Triangle Park, NC 27709, United States |
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| Abstract: | The TEC data obtained at Sagamore Hill observatory by using ATS-3 beacon signal during the period from November 1967 to December 1976 have been used to analyze the solar cycle variations of total electron content at invariant latitude 54°. The correlation coefficients between TEC and sunspot number were found to be largest if 12 month running mean values were used, and to be smallest if monthly mean values were used. By the method of linear regression analysis, the contour charts for real diurnal and seasonal variations of TEC at given sunspot number were constructed and described. The diurnal variation of TEC was represented by the sum of its diurnal mean and first three harmonic components. The solar cycle variations of these components were also given. |
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