Dynamo action in sporadic-E formation |
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| Institution: | 1. Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan;2. Institute of Oral Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan;3. Institute for Translational Medicine, Taipei Medical University, Taipei, Taiwan;4. Department of Internal Medicine, Division of Hematology and Oncology, Chang Gung Memorial Hospital, Taoyuan, Taiwan;5. Graduate Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan;1. University of Cambridge School of Clinical Medicine, Addenbrooke''s Hospital, CB2 0SP;2. Consultant Radiologist Cambridge University Hospital NHS Trust, Cambridge, UK;3. Radiologist Cambridge University Hospital NHS Trust, Cambridge, UK;4. Consultant Breast Surgeon Cambridge University Hospital NHS Trust, Cambridge and Anglia Ruskin School of Medicine, Cambridge, UK |
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| Abstract: | A theoretical study of the effects of background winds on wind shear-produced sporadic-E layers requires an account of the dynamo electric fields which result from the plasma motion produced by these winds. When a sporadic-E layer is carried downward by a descending wind shear the final height of the layer may vary by some 10 km depending on the background wind. Due to a loading effect on the dynamo, for a given background wind, the final height may vary by about 6 km depending on the degree of ionization in the E-layer in the magnetically conjugate hemisphere. The time scale for dispersal of a sporadic-E layer by drifts in wind-induced electric fields may be as little as 2 h. |
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