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On the Origin of Pre-reversal Enhancement of the Zonal Equatorial Electric Field : Volume 27, Issue 5 (05/05/2009)

By Kelley, M. C.

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Book Id: WPLBN0003973541
Format Type: PDF Article :
File Size: Pages 4
Reproduction Date: 2015

Title: On the Origin of Pre-reversal Enhancement of the Zonal Equatorial Electric Field : Volume 27, Issue 5 (05/05/2009)  
Author: Kelley, M. C.
Volume: Vol. 27, Issue 5
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2009
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Crowley, G., Ilma, R. R., & Kelley, M. C. (2009). On the Origin of Pre-reversal Enhancement of the Zonal Equatorial Electric Field : Volume 27, Issue 5 (05/05/2009). Retrieved from http://members.worldlibrary.net/


Description
Description: School of Electrical and Computer Engineering, Cornell University, Ithaca, NY, USA. In November 2004, a large and variable interplanetary electric field (IEF) was felt in the reference frame of the Earth. This electric field penetrated to the magnetic equator and, when the Jicamarca Radio Observatory (JRO) was in the dusk sector, resulted in a reversal of the normal zonal component of the field. In turn, this caused a counter-electrojet (CEJ), a westward current rather than the usual eastward current. At the time of the normal pre-reversal enhancement (PRE) of the eastward field, the Jicamarca incoherent scatter radar (ISR) observed that the westward component became even more westward. Two of the three current explanations for the PRE depend on the neutral wind patterns. However, this unique event was such that the neutral wind-driven dynamos could not have changed. The implication is that the Haerendel-Eccles mechanism, which involves partial closure of the equatorial electrojet (EEJ) after sunset, must be the dominant mechanism for the PRE.

Summary
On the origin of pre-reversal enhancement of the zonal equatorial electric field

Excerpt
Eccles, V.: 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 prereversal enhancement of the zonal electric field in the equatorial ionosphere, J. Geophys. Res., 91, 13723–13728, 1986.; Haerendel, G. and Eccles, J. V.: The role of the equatorial electrojet in the evening ionosphere, J. Geophys. Res., 97, 1181–1197, 1992.; Kelley, M. C. and Dao, E.: On the local time dependence of the penetration of solar wind-induced electric fields to the magnetic equator, Ann. Geophys., in press, 2009.; Kelley, M. C. and Retterer, J. M.: First successful prediction of a convective equatorial ionospheric storm using solar wind parameters, Space Weather, 6, S08003, doi:10.1029/2007SW000381, 2008.; Kelley, M. C., Ilma, R. R., Alken, P., and Maus, S.: Evidence for anomalous Cowling conductivity in the strongly driven equatorial electrojet and a reconciliation of magnetic field data with theory, Geophys. Res. Lett., submitted, 2009a.; Kelley, M. C., Ilma, R. R., Nicolls, M., Ericson, P., Goncharenko, L., Chau, J., and Aponte, N.: Spectacular low and mid-latitude electrical fields and neutral winds during a superstorm, J. Atmos. Solar-Terr. Phys., in press, 2009b.; Rishbeth, H.: Polarization fields produced by winds in the equatorial F-region, Planet. Space Sci., 19, 357–369, 1971.; Scherliess, L. and Fejer, B. G.: Radar and satellite global equatorial F region vertical drift model, J. Geophys. Res., 104, 6829–6842, 1999.

 

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