Electric field measurements in solar flares |
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| Authors: | Zhenda Zhang Raymond N Smartt |
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| Institution: | (1) National Solar Observatory, National Optical Astronomy Observatories, 88349 Sunspot, NM, USA;(2) Present address: Department of Astronomy, Nanjing University, Nanjing, People's Republic of China |
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| Abstract: | Meaurements of solar flare spectra have allowed the electric field strengths in two flares to be determined, using the Inglis-Teller formula. Further, an independently estimated value for the electron density has allowed the two components of this field, that is, the interionic component and the external component that arises, for example, through plasma instabilities, to be separately extracted. External electric field strengths  0.5 kV cm–1 for a limb flare and 1.3 kV cm–1 for a white-light flare are found. Estimates of electric fields strengths generated by the resistive magnetic tearing instability indicate that this process could account for a significant part of the electric field if pre-existing magnetic field strengths in the flaring regions are characterized by a few kilogauss. Other plasma processes probably contribute measurably as well.Operated by the Association of Universities for Research in Astronomy, Inc., under contract NSF AST84-18716 with the National Science Foundation. |
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