| タイトル | Correlation of auroral hiss and upward electron beams near the polar cusp |
| 著者（英） | Shawhan, S. D.; Gurnett, D. A.; Burch, J. L.; Lin, C. S. |
| 著者所属（英） | Southwest Research Inst.|Iowa Univ. |
| 発行日 | 1984-02-01 |
| 言語 | eng |
| 内容記述 | Data were obtained from the DE-1 high-altitude plasma instrument (HAPI) and plasma wave instrument (PWI) during outbound passes through the polar cusp near local noon. The observed distribution functions of electron beams are fitted by drifting Maxwellian functions and the observed distribution functions of hot background electrons by isotropic Maxwellian functions. In addition, the cold plasma density is inferred from knowledge of the electron plasma frequency and the measured density of the warm plasma, including the electron beam distribution. The empirically fitted plasma parameters, including density, temperature and drifting energy, are used to solve the linear dispersion equation for the resulting whistler mode emissions. Because the whistler mode becomes quasi-electrostatic for wave-normal angles near the resonance cone, the electrostatic approximation is used for the whistler mode dispersion relation. The results of wave instability analyses are then compared with the wave observations. A ray tracing of cusp hiss emission is conducted to locate the wave source region (at about one earth-radius). |
| NASA分類 | GEOPHYSICS |
| レポートNO | 84A23664 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/399397 |
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