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Coupled nature of evening-time ionospheric electrodynamics

  • L. M. Joshi
  • L. C. Tsai
Original Article
  • 74 Downloads

Abstract

The F region evening electrodynamics in the equatorial region is characterized by a pre-reversal enhancement (PRE) in the zonal eastward electric field. Although the theoretical mechanisms for PRE are known, its variability, particularly day-to-day variability is not fully resolved. PRE is a large scale phenomenon driven by the F region dynamo after the sunset hours. This paper investigates whether the variability of the E region conductivity (particularly the one associated with the sporadic E, Es) has any influence on the F region dynamo and hence on the PRE of zonal electric field. Interestingly, ionosonde observations have indicated a higher occurrence of the blanketing type Es (Esb) over the low latitude on days with highly suppressed PRE of zonal electric field in comparison with the days with significantly larger PRE. Observational evidences presented in this paper suggests that the formation of the Esb in the evening hours is a sovereign process, not always controlled by the sheared F region vertical electric field of equatorial origin, mapping along the magnetic field line on to the low latitude E region. Model computations of the PRE suppression based on the measured Es densities have further substantiated the observational findings presented in this paper. These results clearly indicate that the low latitude Es has the potential to suppress the PRE of zonal electric field and possibly can play a vital role in explaining the PRE variability, particularly the day-to-day variability. Results have been discussed in light of earlier reports on PRE mechanisms and E-F region coupling processes.

Keywords

Ionospheric electrodynamics F region dynamo Pre-reversal enhancement Sporadic E 

Notes

Acknowledgements

Author (L.M.J.) would like to thank Indian Institute of Geomagnetism (IIG) for the award of “Nanabhoy Moos” post doctoral fellowship for the period November 2014–November 2017. Author (L.M.J.) would like to thank S Sripathi of IIG for his active support and encouragement while at IIG. Author (L.M.J.) would like to specially thank A.K. Patra for some valuable discussions on particular aspects of ionospheric electrodynamics and plasma instabilities. Sriharikota ionosonde data utilized in this Paper can be made available to researchers upon request.

The work was supported in part by grant, MOST 106-2111-M-008-019, from the Ministry of Science and Technology, Taiwan, R.O.C.

Authors would like to acknowledge the reviewer of this paper for his valuable comments.

References

  1. Abdu, M.A., MacDougall, J.W., Batista, I.S., Sobral, J.H.A., Jayachandran, P.T.: J. Geophys. Res. 108, 1254 (2003) CrossRefGoogle Scholar
  2. Akala, A.O., Doherty, P.H., Valladares, C.E., Carrano, C.S., Sheehan, R.: Radio Sci. 46, RS5018 (2011) ADSCrossRefGoogle Scholar
  3. Akala, A.O., Awoyele, A., Doherty, P.H.: Space Weather 14, 233 (2016) ADSCrossRefGoogle Scholar
  4. Anderson, D., Haerendel, G.: J. Geophys. Res. 84(A8), 4251 (1979) ADSCrossRefGoogle Scholar
  5. Batista, I.S., Abdu, M.A.: J. Geophys. Res. 82(29), 4777 (1977) ADSCrossRefGoogle Scholar
  6. Batista, I.S., Abdu, M.A., Carrasco, A.J., Reinisch, B.W., de Paula, E.R., Schuch, N.J., Bertoni, F.: J. Atmos. Sol.-Terr. Phys. 70, 1133 (2008) ADSCrossRefGoogle Scholar
  7. Bishop, R.L., Earle, G.D.: J. Geophys. Res. 108(A1), 1019 (2003) CrossRefGoogle Scholar
  8. Carrasco, A.J., Batista, I.S., Abdu, M.A.: J. Atmos. Sol.-Terr. Phys. 67, 1610 (2005) ADSCrossRefGoogle Scholar
  9. Carrasco, A.J., Batista, I.S., Abdu, M.A.: J. Geophys. Res. 112, A06324 (2007) ADSGoogle Scholar
  10. Carter, L.N., Forbes, J.M.: Ann. Geophys. 17, 190 (1999) ADSCrossRefGoogle Scholar
  11. Chen, C.-H., Lin, C., Chen, W.-H., Matsuo, T.: Geophys. Res. Lett. 44, 1652–1659 (2017) ADSGoogle Scholar
  12. de Lima, G.R.T., Stephany, S., de Paula, E.R., Batista, I.S., Abdu, M.A., Rezende, L.F.C., Aquino, M.G.S., Dutra, A.P.S.: Space Weather 12, 406 (2014) ADSCrossRefGoogle Scholar
  13. Earle, G.D., Bishop, R.L., Collins, S.C., González, S.A., Sulzer, M.P.: J. Geophys. Res. 105(A11), 24951 (2000) ADSCrossRefGoogle Scholar
  14. Eccles, J.V.: J. Geophys. Res. 103, 26709 (1998) ADSCrossRefGoogle Scholar
  15. Farley, D.T., Bonelli, E., Fejer, B.G., Larsen, M.F.: J. Geophys. Res. 91(A12), 13723 (1986) ADSCrossRefGoogle Scholar
  16. Fejer, B.G., dePaula, E.R., González, S.A., Woodman, R.F.: J. Geophys. Res. 96(A8), 13901 (1991) ADSCrossRefGoogle Scholar
  17. Fesen, C.G., Crowley, G., Roble, R.G., Richmond, A.D., Fejer, B.G.: Geophys. Res. Lett. 27(13), 1851 (2000) ADSCrossRefGoogle Scholar
  18. Gardner, L.C., Schunk, R.W., Scherliess, L., Sojka, J.J., Zhu, L.: Space Weather 12, 675 (2014) ADSCrossRefGoogle Scholar
  19. Haerendel, G., Eccles, J.V.: J. Geophys. Res. 97(A2), 1181 (1992) ADSCrossRefGoogle Scholar
  20. Heelis, R.A., Kendall, P.C., Moffett, R.J., Windle, D.W., Rishbeth, H.: Planet. Space Sci. 22, 743 (1974) ADSCrossRefGoogle Scholar
  21. Heelis, R.A., Crowley, G., Rodrigues, F., Reynolds, A., Wilder, R., Azeem, I., Maute, A.: J. Geophys. Res. 117, A08308 (2012) ADSCrossRefGoogle Scholar
  22. Joshi, L.M.: J. Geophys. Res. Space Phys. 121, 6986 (2016) ADSCrossRefGoogle Scholar
  23. Joshi, L.M., Sripathi, S.: J. Geophys. Res. Space Phys. 121, 2795 (2016) ADSCrossRefGoogle Scholar
  24. Joshi, L.M., Patra, A.K., Rao, S.V.B.: Indian J. Radio Space Phys. 41, 208 (2012) Google Scholar
  25. Joshi, L.M., Patra, A.K., Pant, T.K., Rao, S.V.B.: J. Geophys. Res. Space Phys. 118, 524 (2013a) ADSCrossRefGoogle Scholar
  26. Joshi, L.M., Patra, A.K., Rao, S.V.B.: J. Geophys. Res. Space Phys. 118, 1170 (2013b) ADSCrossRefGoogle Scholar
  27. Joshi, L.M., Sripathi, S., Singh, R.: J. Geophys. Res. Space Phys. 121, 2489 (2016) ADSCrossRefGoogle Scholar
  28. Kelley, M.C.: The Earth’s Ionosphere, 2nd edn. Academic Press, New York (2009) Google Scholar
  29. Kelly, M.A., Comberiate, J.M., Miller, E.S., Paxton, L.J.: Space Weather 12, 601 (2014) ADSCrossRefGoogle Scholar
  30. LaBelle, J.: J. Geophys. Res. 90(A5), 4341 (1985) ADSCrossRefGoogle Scholar
  31. Mathews, J.D., Bekeny, F.S.: J. Geophys. Res. 84(A6), 2743 (1979) ADSCrossRefGoogle Scholar
  32. Oladipo, O.A., Adeniyi, J.O., Olawepo, A.O., Doherty, P.H.: Space Weather 12, 300 (2014) ADSCrossRefGoogle Scholar
  33. Picone, J.M., Hedin, A.E., Drob, D.P., Aikin, A.C.: J. Geophys. Res. 107(A12), 1468 (2002) CrossRefGoogle Scholar
  34. Richmond, A.D., Fang, T.W.: J. Geophys. Res. Space Phys. 120, 2133 (2015) ADSCrossRefGoogle Scholar
  35. Richmond, A.D., Fang, T.W., Maute, A.: J. Geophys. Res. Space Phys. 120, 2118 (2015) ADSCrossRefGoogle Scholar
  36. Rishbeth, H.: Planet. Space Sci. 19, 357 (1971) ADSCrossRefGoogle Scholar
  37. Roddy, P.A., Earle, G.D., Swenson, C.M., Carlson, C.G., Bullett, T.W.: J. Geophys. Res. 112, A06312 (2007) ADSCrossRefGoogle Scholar
  38. Rodrigues, F.S., Crowley, G., Heelis, R.A., Maute, A., Reynolds, A.: J. Geophys. Res. 117, A05307 (2012) ADSCrossRefGoogle Scholar
  39. Stephan, A.W., Colerico, M., Mendillo, M., Reinisch, B.W., Anderson, D.: J. Geophys. Res. 107, 1021 (2002) CrossRefGoogle Scholar
  40. Tiwari, R., Strangeways, H.J.: Space Weather 13, 72 (2015) ADSCrossRefGoogle Scholar
  41. Woodman, R.F.: J. Geophys. Res. 75(31), 6249 (1970) ADSCrossRefGoogle Scholar
  42. Yue, X., Schreiner, W.S., Pedatella, N.M., Kuo, Y.H.: Space Weather 14, 285 (2016) ADSCrossRefGoogle Scholar

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© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Indian Institute of GeomagnetismNavi MumbaiIndia
  2. 2.Center for Space and Remote Sensing ResearchNational Central UniversityChung-LiTaiwan, ROC

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