Ionospheric polarization electric field guiding magnetopause reconnection: A conceptual model of throat aurora

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Frequently observed throat auroras have been suggested to be correspondent to indentations on the subsolar magnetopause, but how these indentations can be generated is unknown yet. Based on analyzing the detailed observational features of throat aurora, a conceptual model for generation of throat aurora is proposed. This model suggests that precipitation of a north-south aligned stripy diffuse aurora can lead to an ionospheric conductivity enhancement and thus produce a polarization electric field in dusk-to-dawn direction in the ionosphere. After mapping to the magnetosphere along closed field lines, this electric field can guide a magnetopause reconnection to develop inward the magnetosphere and result in a throat aurora. Because this model can comprehensively explain all the observational results that have been presented up to now, we argue that the assumption of ionospheric polarization electric field affecting magnetopause reconnection should be true and be worthy of further investigations.

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  1. Chen X C, Han D S, Lorentzen D A, Oksavik K, Moen J I, Baddeley L J. 2017. Dynamic properties of throat aurora revealed by simultaneous ground and satellite observations. J Geophys Res-Space Phys, 122: 3469–3486

  2. Han D S, Chen X C, Liu J J, Qiu Q, Keika K, Hu Z J, Liu J M, Hu H Q, Yang H G. 2015. An extensive survey of dayside diffuse aurora based on optical observations at Yellow River Station. J Geophys Res-Space Phys, 120: 7447–7465

  3. Han D S, Hietala H, Chen X C, Nishimura Y, Lyons L R, Liu J J, Hu H Q, Yang H G. 2017a. Observational properties of dayside throat aurora and implications on the possible generation mechanisms. J Geophys Res-Space Phys, 122: 1853–1870

  4. Han D S, Li J X, Nishimura Y, Lyons L R, Bortnik J, Zhou M, Liu J J, Hu Z J, Hu H Q, Yang H G, Fuselier S A, Le Contel O, Ergun R E, Malaspina D, Lindqvist P A, Pollock C J. 2017b. Coordinated observations of two types of diffuse auroras near magnetic local noon by magnetospheric multiscale mission and ground all-sky camera. Geophys Res Lett, 44: 8130–8139

  5. Han D S, Liu J J, Chen X C, Xu T, Li B, Hu Z J, Hu H Q, Yang H G, Fuselier S A, Pollock C J. 2018. Direct evidence for throat aurora being the ionospheric signature of magnetopause transient and reflecting localized magnetopause indentations. J Geophys Res-Space Phys, 123: 2658–2667

  6. Han D S, Nishimura Y, Lyons L R, Hu H Q, Yang H G. 2016. Throat aurora: The ionospheric signature of magnetosheath particles penetrating into the magnetosphere. Geophys Res Lett, 43: 1819–1827

  7. Junginger H, Baumjohann W. 1988. Dayside long-period magnetospheric pulsations: Solar wind dependence. J Geophys Res, 93: 877–883

  8. Lemaire J. 1977. Impulsive penetration of filamentary plasma elements into the magnetospheres of the Earth and Jupiter. Planet Space Sci, 25: 887–890

  9. Lockwood M. 1997. Relationship of dayside auroral precipitations to the open-closed separatrix and the pattern of convective flow. J Geophys Res, 102: 17475–17487

  10. Mende S B, Frey H U, Angelopoulos V. 2016. Source of the dayside cusp aurora. J Geophys Res-Space Phys, 121: 7728–7738

  11. Ni B, Bortnik J, Nishimura Y, Thorne R M, Li W, Angelopoulos V, Ebihara Y, Weatherwax A T. 2014. Chorus wave scattering responsible for the Earth’s dayside diffuse auroral precipitation: A detailed case study. J Geophys Res-Space Phys, 119: 897–908

  12. Ni B, Thorne R M, Zhang X, Bortnik J, Pu Z, Xie L, Hu Z, Han D, Shi R, Zhou C, Gu X. 2016. Origins of the Earth’s diffuse auroral precipitation. Space Sci Rev, 200: 205–259

  13. Pudovkin M I. 1974. Electric fields and currents in the ionosphere. Space Sci Rev, 16: 727–770

  14. Russell C T, Elphic R C. 1979. ISEE observations of flux transfer events at the dayside magnetopause. Geophys Res Lett, 6: 33–36

  15. Sibeck D G. 1992. Transient events in the outer magnetosphere: Boundary waves or flux transfer events? J Geophys Res, 97: 4009–4026

  16. Tu J, Song P, Reinisch B W, Song P, Foster J, Mendillo M, Bilitza D. 2008. On the concept of penetration electric field. In: AIP Conference Proceedings. 974: 81–85

  17. Wang B, Nishimura Y, Hietala H, Lyons L, Angelopoulos V, Plaschke F, Ebihara Y, Weatherwax A. 2018. Impacts of magnetosheath high–speed jets on the magnetosphere and ionosphere measured by optical imaging and satellite observations. J Geophys Res–Space Phys, 123: 4879–4894

  18. Zhang Q H, Zhang B C, Moen J, Lockwood M, McCrea I W, Yang H G, Hu H Q, Liu R Y, Zhang S R, Lester M. 2013. Polar cap patch segmentation of the tongue of ionization in the morning convection cell. Geophys Res Lett, 40: 2918–2922

  19. Zhang Q H, Zong Q G, Lockwood M, Heelis R A, Hairston M, Liang J, McCrea I, Zhang B C, Moen J, Zhang S R, Zhang Y L, Ruohoniemi J M, Lester M, Thomas E G, Liu R Y, Dunlop M W, Liu Y C M, Ma Y Z. 2016. Earth’s ion upflow associated with polar cap patches: Global and in situ observations. Geophys Res Lett, 43: 1845–1853

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The ASI data were provided by the Polar Research Institute of China. This work was supported by the National Key R & D Program of China (Grant No. 2018YFC1407303) and the National Natural Science Foundation of China (Grant Nos. 41774174, 41704159, 41831072 & 41431072).

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Correspondence to Desheng Han.

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Han, D. Ionospheric polarization electric field guiding magnetopause reconnection: A conceptual model of throat aurora. Sci. China Earth Sci. 62, 2099–2105 (2019).

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  • Throat aurora
  • Ionospheric polarization electric field
  • Magnetopause reconnection
  • Magnetosphere-ionosphere coupling
  • Cusp ionosphere