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Investigations of the Ionospheric Alfvén Resonator at High Latitudes of both Northern and Southern Hemisphere

By Kai Yuan


In order to characterize the features of the Ionospheric Alfvén Resonator (IAR) at high latitudes in both northern and southern hemispheres, both data interpretation and numerical computation are presented. Four IAR events observed by the pulsation magnetometer at Sodankylä in a single month were statistically analysed. It was found that the IAR eigenfrequency separations fluctuate with time. The fluctuation was dominated by plasma density perturbation in the ionosphere. Also, a single IAR event observed by five pulsation magnetometers simultaneously was analysed. The analysis showed the eigenfrequencies of the single IAR detected at different locations are different. Additionally, the eigenfrequency shifts were found to differ at different locations. It indicates that the horizontal scale of a single IAR event could be up to thousands of kilometres. The horizontal structure of the IAR in a large scale is non-uniform. Also, the study has revealed that the visibility of the Spectrum Resonance Structure (SRS) strongly depends on the fluctuation rate of the eigenfrequency separations. Moreover, the first study of IARs in Antarctica was carried out. The IAR occurrence and the relation with the solar activities were investigated statistically. \ud In addition, a numerical model was introduced in this thesis. Based on this model the boundary condition dependence of the IAR was investigated. According to the study the detected eigenfrequencies, the spatial structures of the field and the ratio between the intensities of the total current and the source current strongly depend on the ratio between the wave conductivity and the height integrated Pedersen conductivity in the E region. Also, the numerical study in this thesis has revealed that the eigenfrequency shifts respond to the different features of plasma density perturbations in different ways. The possibility of estimating the plasma density perturbation continuously from the IAR eigenfrequencies observed on the ground is illustrated

Publisher: University of Leicester
Year: 2011
OAI identifier:

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  13. (2000). FAST observations of ULF waves injected into the magnetosphere by means of modulated RF heating of the auroral electrojet, doi
  14. (1991). Feedback Instability of the Ionospheric Resonant Cavity, doi
  15. (2006). First results of artificial stimulation of the ionospheric Alfvén resonator at 78°N, doi
  16. (1981). Influence of Alfvén velocity inhomogeneous profile on magnetospheric convection stratification.
  17. (1985). Introduction to wave phenomena, WileyInterscience",
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  22. (1969). Large-Amplitude Alfvén Waves in the Interplanetary Medium: Mariner 5, doi
  23. (2004). Multiscale electrodynamics of the ionosphere‐ magnetosphere system, doi
  24. (2000). Non-stationary Alfvén resonator: new results on Pc1 pearls and IPDP events, doi
  25. (1987). Numerical methods for mathematics, science, and engineering",
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  27. (2008). On distant excitation of the ionospheric Alfvén resonator by positive cloud‐to‐ground lightning discharges, doi
  28. (1976). On the properties of the ionospheric Alfvén resonator, KAPG
  29. (2001). Persistent solar influence on North Atlantic climate during the Holocene.
  30. (1969). PLASMA DYNAMICS", doi
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  34. (2009). Rocket‐based measurements of ion velocity, neutral wind, and electric field in the collisional transition region of the auroral ionosphere, doi
  35. (2003). Solar activity and terrestrial climate: an analysis of some purported correlations, doi
  36. (2000). Solar cycle variations in the ionospheric Alfvén resonator 1985-1995, doi
  37. (2001). Space weather effects on technologies, in Space Weather", American Geophysical doi
  38. (1997). Spacecraft transits across simulated field line resonance regions, doi
  39. (1989). The Earth's Ionosphere: Plasma Physics and Electrodynamics". doi
  40. (2007). The effective altitude range of the ionospheric Alfvén resonatorstudied by high-altitude EISCAT measurements, doi
  41. (2010). Three‐dimensional hybrid simulation of magnetosheath reconnection under northward and southward interplanetary magnetic field, doi
  42. (2000). V.Yu Trakhtengerts doi
  43. (1992). Wave Phenomena in the Upstream Region of Saturn, doi
  44. (1997). Wireless at high altitudes--environmental effects on space-based assets, doi

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