A GLOBAL ANALYTICAL REPRESENTATION OF THE MAGNETIC-FIELD PRODUCED BY THE REGION-2 BIRKELAND CURRENTS AND THE PARTIAL RING CURRENT

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A GLOBAL ANALYTICAL REPRESENTATION OF THE MAGNETIC-FIELD PRODUCED BY THE REGION-2 BIRKELAND CURRENTS AND THE PARTIAL RING CURRENT. / TSYGANENKO, NA.

In: JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE, Vol. 98, No. A4, 01.04.1993, p. 5677-5690.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{bb67759f1c284afc9e2c98fcd53766bf,

title = "A GLOBAL ANALYTICAL REPRESENTATION OF THE MAGNETIC-FIELD PRODUCED BY THE REGION-2 BIRKELAND CURRENTS AND THE PARTIAL RING CURRENT",

abstract = "A quantitative model is developed of the magnetic field produced by the electric current system of region 2 Birkeland currents, closed via the partial ring current. The distribution of j(perpendicular-to) is computed from a given axially asymmetric spatial distribution of hot isotropic magnetospheric plasma over an infinitely thin L shell in an axisymmetric purely dipolar geomagnetic field, while the field-aligned current density is found from the continuity of the net electric current. The magnetic field distribution is derived by a Biot-Savart integral over the electric current system. An assumed cosine dependence of the plasma pressure on local time makes it possible to reduce the problem of analytical representation of the B field to two dimensions, The obtained numerical fits for the partial ring current/region 2 Birkeland current magnetic field are relatively simple, continuous, and valid throughout the whole extraterrestrial space from ionospheric heights up to tens of R(E). To our knowledge, this is a first global analytical representation for the magnetic field of the partial ring current system which can be incorporated in future advanced models of the external geomagnetic field.",

keywords = "magnetosphere, ring current, Birkeland currents, Geomagnetic field, modeling",

author = "NA TSYGANENKO",

year = "1993",

month = apr,

day = "1",

doi = "10.1029/92JA02002",

language = "English",

volume = "98",

pages = "5677--5690",

journal = "Journal of Geophysical Research: Biogeosciences",

issn = "0148-0227",

publisher = "American Geophysical Union",

number = "A4",

}

RIS

TY - JOUR

T1 - A GLOBAL ANALYTICAL REPRESENTATION OF THE MAGNETIC-FIELD PRODUCED BY THE REGION-2 BIRKELAND CURRENTS AND THE PARTIAL RING CURRENT

AU - TSYGANENKO, NA

PY - 1993/4/1

Y1 - 1993/4/1

N2 - A quantitative model is developed of the magnetic field produced by the electric current system of region 2 Birkeland currents, closed via the partial ring current. The distribution of j(perpendicular-to) is computed from a given axially asymmetric spatial distribution of hot isotropic magnetospheric plasma over an infinitely thin L shell in an axisymmetric purely dipolar geomagnetic field, while the field-aligned current density is found from the continuity of the net electric current. The magnetic field distribution is derived by a Biot-Savart integral over the electric current system. An assumed cosine dependence of the plasma pressure on local time makes it possible to reduce the problem of analytical representation of the B field to two dimensions, The obtained numerical fits for the partial ring current/region 2 Birkeland current magnetic field are relatively simple, continuous, and valid throughout the whole extraterrestrial space from ionospheric heights up to tens of R(E). To our knowledge, this is a first global analytical representation for the magnetic field of the partial ring current system which can be incorporated in future advanced models of the external geomagnetic field.

AB - A quantitative model is developed of the magnetic field produced by the electric current system of region 2 Birkeland currents, closed via the partial ring current. The distribution of j(perpendicular-to) is computed from a given axially asymmetric spatial distribution of hot isotropic magnetospheric plasma over an infinitely thin L shell in an axisymmetric purely dipolar geomagnetic field, while the field-aligned current density is found from the continuity of the net electric current. The magnetic field distribution is derived by a Biot-Savart integral over the electric current system. An assumed cosine dependence of the plasma pressure on local time makes it possible to reduce the problem of analytical representation of the B field to two dimensions, The obtained numerical fits for the partial ring current/region 2 Birkeland current magnetic field are relatively simple, continuous, and valid throughout the whole extraterrestrial space from ionospheric heights up to tens of R(E). To our knowledge, this is a first global analytical representation for the magnetic field of the partial ring current system which can be incorporated in future advanced models of the external geomagnetic field.

KW - magnetosphere

KW - ring current

KW - Birkeland currents

KW - Geomagnetic field

KW - modeling

U2 - 10.1029/92JA02002

DO - 10.1029/92JA02002

M3 - Article

VL - 98

SP - 5677

EP - 5690

JO - Journal of Geophysical Research: Biogeosciences

JF - Journal of Geophysical Research: Biogeosciences

SN - 0148-0227

IS - A4

ER -

ID: 28014099