Electric field sources in the quiet plasmasphere from whistler observations |
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| Affiliation: | 1. Centro Grossi Paoletti, Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milan, Italy;2. Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano, Milan, Italy;3. Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milan, Italy;4. Centro Dislipidemie, A.S.S.T. Grande Ospedale Metropolitano Niguarda, Milan, Italy;1. Department of Microbiology and Biotechnology, Corvinus University of Budapest, H-1118 Budapest, Somlóiút 14-16, Hungary;2. CBQF-Centro de Biotecnologia e Química Fina, Laboratório Associado, Escola Superior de Biotecnologia, Universidade Católica Portuguesa/Porto, Portugal;1. Department of Internal Medicine, Mayo Clinic, Jacksonville, FL, USA;2. Department of Health Science Research, Mayo Clinic, Rochester, MN, USA;3. Department of Family Medicine, Mayo Clinic, Rochester, MN, USA |
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| Abstract: | Existing evidence for the ionospheric dynamo being the source of quiet time electric fields in the plasmasphere is reviewed. Part of a 24 h set of whistler data recorded continuously at Sanae, Antarctica (L = 4), during quiet magnetic (average Kp = 1) is analysed to obtain westward electric fields in the equatorial plane. These electric fields are examined as a function of L-value in order to infer their source. It is found that for periods of outward flow of plasma during the noon-midnight local time period, the electric fields are consistent with the dominant source being the ionospheric dynamo. There is some evidence that during the evening period of inward flow the electric fields are magnetospheric in origin, although this could also be consistent with a refined dynamo model. The observed whistler duct convection patterns do not fit either of two theoretical models, which invoke a magnetospheric field but not a dynamo field. |
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