Spectral characteristics of high frequency waves backscattered by small scale F-region irregularities: evidence of strong sub-auroral ion flow |
| |
| Institution: | 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. Universidade do Vale do Paraíba, Instituto de Pesquisa e Desenvolvimento, São José dos Campos-SP 12.244-000, Brazil;2. Instituto Federal do Maranhão, Departamento de Ensino de Física, Bacabal, MA 65.700-000, Brazil;3. State Key Laboratory of Space Weather, 100190 Beijing, China;4. Instituto Nacional de Pesquisas Espaciais, Divisão de Aeronomia, São José dos Campos-SP, 12.227-010, Brazil;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 |
| |
| Abstract: | The spectra of high frequency waves backscattered at night by small scale (10–20 m) sub-auroral F-region irregularities often exhibit large Doppler shifts and widths in the local time sector 2000–2400. After local midnight the Doppler shifts and the widths of the spectra decrease rapidly. We present examples of experimental data, obtained with the two coherent backscatter radars of the EDIA1 experiment, showing the spectral characteristics just mentioned. From the Doppler shift measured at the two sites we deduced the perpendicular velocity of the irregularities, which can reach values as high as 2000 ms −1. These observations are interpreted using results of theoretical models which predict strong sub-auroral ion flow in the trough region. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
