Contours of equatorial electrojet current density

Onwumechili, C. Agodi; Ozoemena, P. C.

doi:10.1016/0021-9169(89)90098-6

Cited by 9 publications

(2 citation statements)

References 17 publications

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“…On 'disturbed' days there is an additional variation, which includes superimposed magnetic storm signatures. Because the geomagnetic field is strictly horizontal at the dip equator, there is an enhancement of the effective conductivity, which results in an enhanced eastward current, called the equatorial electrojet (EEJ), flowing along a few hundred kilometre wide band centred on the dayside dip equator (see Onwumechilli & Ozoemena 1989). In addition, auroral electrojets (AEJ) flow in the auroral belt and vary in amplitude with different levels of magnetic activity.…”

Section: Near-earth Magnetic Field Contributionsmentioning

confidence: 99%

A comprehensive model of the quiet-time, near-Earth magnetic field: phase 3

Sabaka¹,

Olsen²,

Langel

2002

Geophysical Journal International

189

171

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Summary The near‐Earth magnetic field is caused by sources in the Earth's core, ionosphere, magnetosphere, lithosphere and from coupling currents between the ionosphere and the magnetosphere, and between hemispheres. Traditionally, the main field (low degree internal field) and magnetospheric field have been modelled simultaneously, with fields from other sources being modelled separately. Such a scheme, however, can introduce spurious features, especially when the spatial and temporal scales of the fields overlap. A new model, designated CM3 (Comprehensive Model: phase 3), is the third in a series of efforts to coestimate fields from all of these sources. This model has been derived from quiet‐time Magsat and POGO satellite and observatory hourly means measurements for the period 1960–1985. It represents a significant advance in the treatment of the aforementioned field sources over previous attempts, and includes an accounting for main field influences on the magnetosphere, main field and solar activity influences on the ionosphere, seasonal influences on the coupling currents, a priori characterization of the influence of the ionosphere and the magnetosphere on Earth‐induced fields, and an explicit parametrization and estimation of the lithospheric field. The result is a model that describes well the 591 432 data with 16 594 parameters, implying a data‐to‐parameter ratio of 36, which is larger than several popular field models.

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Section: Near-earth Magnetic Field Contributionsmentioning

confidence: 99%

A comprehensive model of the quiet-time, near-Earth magnetic field: phase 3

Sabaka¹,

Olsen²,

Langel

2002

Geophysical Journal International

189

171

View full text Add to dashboard Cite

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“…For a long time it has not been possible to determine from ground data all the parameters of a model of equatorial electrojet put forth as far back as 1965 (ONWUMECHILI, 1965(ONWUMECHILI, , 1966. Consequently, its view of the equatorial electrojet (EEJ) could not be fully examined.…”

Section: Introductionmentioning

confidence: 99%

Landmark values of equational electrojet current and magnetic field along a meridian near noon.

Onwumechili

Ozoemena

Agu

1989

J. geomagn. geoelec

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Landmark values of the equatorial electrojet: the minimum intensity Jm A.km-1, its distance xm km and ratio to maximum intensity Jm/Jo; the magnetic field constant K nT; the maximum northward magnetic field Xo nT, and the distance of zero northward magnetic field wx km; the minimum northward magnetic field Xm nT, its distance um km and ratio to maximum northward field Xm/Xo; the vertical magnetic field Zo nT at the dip equator and the distance of zero vertical field wz km; the maximum vertical magnetic field ZM nT, its distance uM km and ratio to maximum northward field Zm/Xo; have all been derived from September equinox satellite data and they compare favourably with their values from ground-based data. Our Jm/Jo agrees excellently with MUSMANN and SEILER (1978) and ANANDARAO and RAGHAVARAO (1979); while our xm agrees excellently with the location of CAHILL's (1959) westward current, and the findings of MUSMANN and SEILER (1978). The landmark distances xm, wx, um, uM, wz and the ratios Jm/Jo, Xm/Xo and ZM/ Xo do not vary with longitude but the intensity Jm and magnetic fields, K, Xo, Xm, Zo and

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