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Ann. Geophys., 36, 101-106, 2018
https://doi.org/10.5194/angeo-36-101-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
ANGEO Communicates
24 Jan 2018
Evaluation of electromotive force in interplanetary space
Yasuhito Narita1,2 and Zoltán Vörös1,2,3 1Space Research Institute, Austrian Academy of Sciences, Schmiedlstr. 6, 8042 Graz, Austria
2Institute of Physics, University of Graz, Universitätsplatz 5, 8010 Graz, Austria
3Department of Geophysics and Space Sciences, Eötvös University, Budapest, Hungary
Abstract. Electromotive force plays a central role in the turbulent dynamo mechanism and carries important information on the nature of the turbulent fields. In this study, an analysis method is developed for the electromotive force and the transport coefficients such as those for the α effect (coefficient α) and the turbulent diffusivity (coefficient β). The method is applied to a magnetic cloud event observed by the Helios 2 spacecraft in the inner heliosphere. The electromotive force is enhanced together with the magnetic cloud event by 1 or 2 orders of magnitude, suggesting that the magnetic field can locally be amplified in the heliosphere, presumably for a short time.

Citation: Narita, Y. and Vörös, Z.: Evaluation of electromotive force in interplanetary space, Ann. Geophys., 36, 101-106, https://doi.org/10.5194/angeo-36-101-2018, 2018.
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Short summary
Electromotive force plays a central role in the dynamo mechanism amplifying the magnetic field in turbulent plasmas and electrically conducting fluids. An algorithm is developed to measure the electromotive force using spacecraft data, and it is applied to a magnetic cloud event in interplanetary space. The electromotive force is enhanced when the magnetic cloud passes by the spacecraft, indicating local amplification of the magnetic field.
Electromotive force plays a central role in the dynamo mechanism amplifying the magnetic field...
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