The amplitude of auroral backscatter: II. Topology of the backscatter range-azimuth distribution |
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| Institution: | 1. Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China;2. Wuhan University, Wuhan 430072, China;1. Universidade do Vale do Paraíba – Univap, São José dos Campos – SP, Brazil;2. Instituto Federal do Maranhão – IFMA, Alcântara, MA, Brazil;3. Instituto Nacional de Pesquisas Espaciais – INPE, São José dos Campos-SP, Brazil;4. State Key Laboratory of Space Weather, Beijing, China;1. Centro de Instrumentación Científica, Universidad Adventista de Chile, Chillán, Chile;2. Centro Interuniversitario de Física de La Alta Atmósfera, Chile;3. State Key Laboratory of Space Weather, NSSC/CAS, Beijing, China;4. National Institute for Space Research-INPE, São José dos Campos, SP, Brazil;5. Universidad del Bío-Bío, Concepción, Chile |
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| Abstract: | The range-azimuth distribution of auroral backscatter echoes received at Essoyla at frequencies of 93 and 45 MHz is predicted for a model which includes the effects of electron density, magnetic aspect angle, and the azimuth of current flow and also takes into account ionospheric refraction. The distribution is in the form of an arc with maxima of backscatter in both eastern and western wings. As the electron density increases, the intensity of the backscatter increases more rapidly and the azimuths of maximum backscatter separate even further. For currents flowing along the L-shells, the backscatter is strongest in the eastward wing. This asymmetry is intensified if the current flow is rotated anti-clockwise but if the current flow is rotated sufficiently in a clockwise direction the backscatter is stronger in the westward wing. These predictions are supported by observations made at Essoyla. |
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