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Eiscat observations of the ionospheric D-region during auroral radio absorption events |
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| Institution: | 1. Indian Institute of Information Technology Kalyani, Kalyani 741235, West Bengal, India;2. Department of Space Science and Engineering, National Central University, Jhongli, Taoyuan 32001, Taiwan;1. Department of Physics, Alipurduar University, Alipurduar, West Bengal, India;2. Fundamental Plasma Experiments Division, Institute for Plasma Research, Bhat, Gandhinagar, India;3. Department of Physics, College of William and Mary, Williamsburg, Virginia, USA;4. Department of Physics, Alipurduar College, North Bengal University, Alipurduar, West Bengal, India;1. Department of Physics, University of Kashmir, Srinagar, India;2. National Atmospheric Research Laboratory, Dept. of Space, India |
| Abstract: | Electron densities in the D-region have been observed with EISCAT during energetic electron precipitation events. Sample results are presented which demonstrate the value of the technique in studying variations of electron density with fine temporal and spatial resolution. Different types of absorption event can be characterized in terms of the changes in the incoming electron spectrum inferred from profiles of electron density. We contrast the D-region behaviour of night- and day-time events in terms of precipitating spectrum and absorption profile. A softening of the electron spectrum during the course of a morning event is clearly seen. |
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