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

Kelley, M. C.; Ilma, R. R.; Crowley, G.

doi:10.5194/angeo-27-2053-2009

Cited by 40 publications

(35 citation statements)

References 8 publications

(8 reference statements)

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“…Unfortunately, their earliest calculation was at 17:00 LT since they were studying the prereversal enhancement in the zonal electric field [Kelley et al, 2009]. Nonetheless, they found that the vertical electric field peaked at 107 km without needing to modify the collision frequency.…”

Section: A Classical Resolution To the Eej Problemmentioning

confidence: 99%

“…Since E f is taken as the typical quiet time zonal electric field at noon on the basis of Jicamarca radar measurements [Kelley et al, 2009], it is possible to calculate E L by using the field line-integrated conductivities (equations (3) to (5)) together with the vertical current density (equation (8)) in equation (6). Note that we arbitrarily take t = 0 at local (solar time) noon.…”

Section: A Classical Resolution To the Eej Problemmentioning

confidence: 99%

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Reconciliation of rocket‐based magnetic field measurements in the equatorial electrojet with classical collision theory

2012

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[1] We provide an explanation for a long-standing (more than 35 years) discrepancy between theory and rocket experiments concerning the peak height of the electrojet current and the magnitude of magnetic field perturbation. The arbitrary correction of the electron-neutral collision frequency by a factor of 4, which has been used to explain these problems, is not necessary if the field line-integrated conductivities are used. Recent research using ground-based magnetometers and CHAMP have also used this constant connection to classical collision theory. These methods arbitrarily change the electron-neutral collision frequency. A field line-integrated theoretical study of the electrojet by G. Haerendel and J. V. Eccles, implemented in this paper, explains the height of the electrojet using classical collision frequency. Furthermore, we argue that since the correction factor is independent of the driving electric field, it is unlikely that anomalous electron collision frequency due to a nonlinear plasma instability (gradient drift) is involved.Citation: Kelley, M. C., R. R. Ilma, and V. Eccles (2012), Reconciliation of rocket-based magnetic field measurements in the equatorial electrojet with classical collision theory,

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Section: A Classical Resolution To the Eej Problemmentioning

confidence: 99%

Section: A Classical Resolution To the Eej Problemmentioning

confidence: 99%

Reconciliation of rocket‐based magnetic field measurements in the equatorial electrojet with classical collision theory

2012

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“…whether it is due to the F-region dynamo electric fields getting freed from the field line E-region loading effect (Farley et al, 1986) or due to the irrotational nature of the electric field at the sunset terminator manifesting itself as an enhanced zonal wind (Rishbeth, 1981) or due to the evening EEJ (Haerendel and Eccles, 1992) is still not fully understood. Recently, Kelley et al (2009) considered the above three competing mechanisms that exist for the PRE, in the light of the penetration of a large electric field of interplanetary origin. Their study suggests that the normal PRE must be created by the Haerendel and Eccles (1992) mechanism, in which the EEJ partially closes in the post sunset F-region, and that the other two mechanisms are secondary.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2009

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Abstract. The paper is based on a detailed observational study of the Equatorial Spread F (ESF) events on geomagnetically quiet (A p ≤ 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 Eand 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 (V z ) point towards the potential usage of the EEJ related parameter "E" as an useful index for the assessment of V z prior to the occurrence of ESF.

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“…It can be guessed a double peak structure in the hmF2 near noontime following the IEA and better shown at low solar activity. Also interesting is the observed highest altitudes region at the end of the anomaly, after sunset in the equatorial regions which correlates with the pre-reversal enhancement (PRE) phenomenon (Kelley et al, 2009).…”

Section: Pre-processing Considerations On the Database And The Time Pmentioning

confidence: 96%

A comparison of the LPIM-COSMIC F2 peak parameters determinations against the IRI(CCIR)

Azpilicueta

Altadill²,

Brunini

et al. 2015

Advances in Space Research

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During the last decade the amount of ionosphere measurements, from ground and space born sources, has substantially increased along with the development of high end processing systems. This constitutes a perfect scenario for the International Reference Ionosphere (IRI) to assimilate this huge new database and to satisfy the new needs of the aeronomic community: an IRI with meteorological capability.The first step before the implementation of an assimilative procedure is to validate the new data. This work intends to contribute in this direction by studying the differences (systematic and statistical) between the F2 peak parameters (hmF2 and NmF2) predicted by the IRI(CCIR) and those obtained from the electron density profiles computed with LPIM-COSMIC/Formosat3 (LPIM-C/F3) technique. The analyzed period extends from January 2007 to October 2012, thus covering all the different seasonal Sun-Earth configurations and a range of solar activity going from low to mid-high level.The analysis shows that there is no significant systematic bias between the IRI and LPIM-C/F3 values on both parameters. The obtained differences are comparable to those found between IRI and other models and data sources. In addition a correlation with the solar activity level is observed. The analysis performed is also helpful to study and asses the potentiality of the meteorological information contained in the LPIM-C/F3 by analyzing the standard deviation of the differences. This extra information could represent the key element to improve the IRI predicting capabilities.

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

Cited by 40 publications

References 8 publications

Reconciliation of rocket‐based magnetic field measurements in the equatorial electrojet with classical collision theory

Reconciliation of rocket‐based magnetic field measurements in the equatorial electrojet with classical collision theory

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

A comparison of the LPIM-COSMIC F2 peak parameters determinations against the IRI(CCIR)

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