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Observational Evidence for the Plausible Linkage of Equatorial Electrojet (Eej) Electric Field Variations with the Post Sunset F-region Electrodynamics : Volume 27, Issue 11 (10/11/2009)

By Sreeja, V.

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Book Id: WPLBN0003986982
Format Type: PDF Article :
File Size: Pages 10
Reproduction Date: 2015

Title: Observational Evidence for the Plausible Linkage of Equatorial Electrojet (Eej) Electric Field Variations with the Post Sunset F-region Electrodynamics : Volume 27, Issue 11 (10/11/2009)  
Author: Sreeja, V.
Volume: Vol. 27, Issue 11
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Pant, T. K., Ravindran, S., Devasia, C. V., & Sreeja, V. (2009). Observational Evidence for the Plausible Linkage of Equatorial Electrojet (Eej) Electric Field Variations with the Post Sunset F-region Electrodynamics : Volume 27, Issue 11 (10/11/2009). Retrieved from

Description: Space Physics Laboratory, Vikram Sarabhai Space Centre, Trivandrum 695022, India. The paper is based on a detailed observational study of the Equatorial Spread F (ESF) events on geomagnetically quiet (Ap≤20) days of the solar maximum (2001), moderate (2004) and minimum (2006) years using the ionograms and magnetograms from the magnetic equatorial location of Trivandrum (8.5° N; 77° E; dip lat ~0.5° N) in India. The study brings out some interesting aspects of the daytime Equatorial Electrojet (EEJ) related electric field variations and the post sunset F-region electrodynamics governing the nature of seasonal characteristics of the ESF phenomena during these years. The observed results seem to indicate a plausible linkage of daytime EEJ related electric field variations with pre-reversal enhancement which in turn is related to the occurrence of ESF. These electric field variations are shown to be better represented through a parameter, termed as E, in the context of possible coupling between the E- and F-regions of the ionosphere. The observed similarities in the gross features of the variations in the parameter E and the F-region vertical drift (Vz) point towards the potential usage of the EEJ related parameter E as an useful index for the assessment of Vz prior to the occurrence of ESF.

Observational evidence for the plausible linkage of Equatorial Electrojet (EEJ) electric field variations with the post sunset F-region electrodynamics

Aarons, J.: The longitudinal morphology of Equatorial F-layer irregularities relevant to their occurrence, Space Sci. Rev., 63, 209–243, 1993.; Abdu, M. A., Ramkumar, T. K., Batista, I. S., Brum, C. G. M., Takahasi, H., Reinisch, B. W., and Sobral, J. H. A.: Planetary wave signatures in the equatorial atmosphere-ionosphere system, and mesosphere- E- and F-region coupling, J. Atmos. Terr. Phys., 68, 509–522, 2006.; Abdu, M. A., Sobral, J. H. A., and Batista, I. S.: Equatorial spread-F statistics: some problems relevant to ESF description in the IRI scheme, Adv. Space Res., 25(1), 113–124, 2000.; Alex, S., Koparker, P. V., and Rastogi, R. G.: Spread F and ionization anomaly belt, J. Atmos. Terr. Phys., 51, 371–379, 1989.; Anderson, D., Anghel, A., Yumoto, K., Ishitsuka, M., and Kudeki, E.: Estimating daytime vertical ExB drift velocities in the equatorial F-region using ground-based magnetometer observations, Geophys. Res. Lett., 29, 1596, doi:10.1029/2001GL014562, 2002.; Basu, S., Kudeki, E., Basu, Su., Weber, E. J., Valladares, C. E., Sheehan, R., Meriwether, J. W., Kuenzler, H., Bishop, G. J., and Biondi, M. A.: Scintillations, Plasma drifts, and neutral winds in the equatorial ionosphere after sunset, J. Geophys. Res., 101, 26795–26809, 1996.; Batista, I. S., Abdu, M. A., and Bittencourt, J. A.: Equatorial F region vertical plasma drifts: seasonal and longitudinal asymmetries in the American sector, J. Geophys. Res., 91, 12055–12064, 1986.; Bittencourt, J. A. and Abdu, M. A.: A theoretical comparison between apparent and real ionization drift velocities in the equatorial F-region, J. Geophys. Res., 86, 2451–2454, 1981.; Chandra, H. and Rastogi, R. G.: Solar cycle and seasonal variation of spread F near the magnetic equator, J. Atmos. Terr. Phys., 32, 439–443, 1970.; Crain, D. J., Heelis, R. A., and Bailey, G. J.: Effects of electrical coupling on equatorial ionosphere plasma motions: When is the F region a dominant driver in the low-latitude dynamics?, J. Geophys. Res., 98, 6033–6037, 1993.; Devasia, C. V., Jyoti, N., Vishwanathan, K. S., Subbarao, K. S., Tiwari, D., and Sridhran, R.: On the plausible linkage of thermospheric meridional winds with equatorial spread F, J. Atmos. Solar Terr. Phys., 64, 1–12, 2002.; Devasia, C. V., Sreeja, V., and Ravindran, S.: Solar cycle dependent characteristics of the equatorial blanketing $E_s$ layers and associated irregularities, Ann. Geophys., 24, 2931–2947, 2006.; Dunford, E.: The relationship between the ionospheric equatorial anomaly and the E-region current system, J. Atmos. Solar Terr. Phys., 29, 1489–1498, 1967.; Eccles, J. V.: A modeling investigation of the evening pre-reversal enhancement of the zonal electric field in the equatorial ionosphere, J. Geophys. Res., 103, 26709–26719, 1998.; Farley, D. T., Bonelli, E., Fejer, B. G., and Larsen, M. F.: The pre-reversal enhancement of the zonal electric field in the equatorial ionosphere, J. Geophys. Res., 91, 13723–13728, 1986.; Fejer, B. G., Scherliess, L., and de Paula, E. R.: Effects of the vertical plasma drift velocity on the generation and evolution of equatorial spread F, J. Geophys. Res., 104, 19854–19869, 1999.; Fejer, B. G.: Low latitude electrodynamic plasma drifts: A review, J. Atmos. Terr. Phys., 53, 677–693, 1991.; Fejer, B. G. and Kelley, M. C.: Ionospheric irregularities, Rev. Geophys., 18, 401–454, 1980.; Haerendel, G. and Eccles, J. V.: The role of the equatorial electrojet in the evening ionosphere, J. Geophys. Res., 97, 1181–1197, 1992.; Hysell, D. L. and Burcham, J.: Long term studies of equatorial spread F using the JULIA radar at Jicamarca, J. Atmos. Solar Terr. Phys., 64, 1531–1543, 2002.; Hysell, D. L.: An overview and synthesis of plasma irregularities in equatorial spread F, J. Atmos. Solar Terr. Phys., 62, 1037–1056, 2000.; Jayachandran, P. T., Sri Ram, P., Somayajulu, V. V., and Rama Rao, P. V. S.: Effect of equatorial ionization anomaly on the occurrence of spread-F, Ann. Geophys., 15, 255–262, 1997.


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