Relation between the ring current and the tail current during magnetic storms

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Relation between the ring current and the tail current during magnetic storms. / Kalegaev, V. V.; Ganushkina, N. Y.; Pulkkinen, T. I.; Kubyshkina, M. V.; Singer, H. J.; Russell, C. T.

In: Annales Geophysicae, Vol. 23, No. 2, 2005, p. 523-533.

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

Author

Kalegaev, V. V. ; Ganushkina, N. Y. ; Pulkkinen, T. I. ; Kubyshkina, M. V. ; Singer, H. J. ; Russell, C. T. / Relation between the ring current and the tail current during magnetic storms. In: Annales Geophysicae. 2005 ; Vol. 23, No. 2. pp. 523-533.

BibTeX

@article{df9409026075411786a183297284d11e,

title = "Relation between the ring current and the tail current during magnetic storms",

abstract = "We study the dynamics of the magnetospheric large-scale current systems during storms by using three different magnetospheric magnetic field models: the paraboloid, event-oriented, and Tsyganenko T01 models. We have modelled two storm events, one moderate storm on 25-26 June 1998, when Dst reached -120nT and one intense storm on 21-23 October 1999, when Dst dropped to -250nT. We compare the observed magnetic field from GOES 8, GOES 9, and GOES 10, Polar and Geotail satellites with the magnetic field given by the three models to estimate their reliability. All models demonstrated quite good agreement with observations. Since it is difficult to measure exactly the relative contributions from different current systems to the Dst index, we compute the contributions from ring, tail and magnetopause currents given by the three magnetic field models. We discuss the dependence of the obtained contributions to the Dst index in relation to the methods used in constructing the models. All models show a significant tail current contribution to the Dst index, comparable to the ring current contribution during moderate storms. The ring current becomes the major Dst source during intense storms.",

keywords = "Magnetospheric physics (Current systems; Magnetospheric configuration and dynamics; Storms and substorms)",

author = "Kalegaev, {V. V.} and Ganushkina, {N. Y.} and Pulkkinen, {T. I.} and Kubyshkina, {M. V.} and Singer, {H. J.} and Russell, {C. T.}",

year = "2005",

doi = "10.5194/angeo-23-523-2005",

language = "English",

volume = "23",

pages = "523--533",

journal = "Annales Geophysicae",

issn = "0992-7689",

publisher = "Copernicus GmbH ",

number = "2",

}

RIS

TY - JOUR

T1 - Relation between the ring current and the tail current during magnetic storms

AU - Kalegaev, V. V.

AU - Ganushkina, N. Y.

AU - Pulkkinen, T. I.

AU - Kubyshkina, M. V.

AU - Singer, H. J.

AU - Russell, C. T.

PY - 2005

Y1 - 2005

N2 - We study the dynamics of the magnetospheric large-scale current systems during storms by using three different magnetospheric magnetic field models: the paraboloid, event-oriented, and Tsyganenko T01 models. We have modelled two storm events, one moderate storm on 25-26 June 1998, when Dst reached -120nT and one intense storm on 21-23 October 1999, when Dst dropped to -250nT. We compare the observed magnetic field from GOES 8, GOES 9, and GOES 10, Polar and Geotail satellites with the magnetic field given by the three models to estimate their reliability. All models demonstrated quite good agreement with observations. Since it is difficult to measure exactly the relative contributions from different current systems to the Dst index, we compute the contributions from ring, tail and magnetopause currents given by the three magnetic field models. We discuss the dependence of the obtained contributions to the Dst index in relation to the methods used in constructing the models. All models show a significant tail current contribution to the Dst index, comparable to the ring current contribution during moderate storms. The ring current becomes the major Dst source during intense storms.

AB - We study the dynamics of the magnetospheric large-scale current systems during storms by using three different magnetospheric magnetic field models: the paraboloid, event-oriented, and Tsyganenko T01 models. We have modelled two storm events, one moderate storm on 25-26 June 1998, when Dst reached -120nT and one intense storm on 21-23 October 1999, when Dst dropped to -250nT. We compare the observed magnetic field from GOES 8, GOES 9, and GOES 10, Polar and Geotail satellites with the magnetic field given by the three models to estimate their reliability. All models demonstrated quite good agreement with observations. Since it is difficult to measure exactly the relative contributions from different current systems to the Dst index, we compute the contributions from ring, tail and magnetopause currents given by the three magnetic field models. We discuss the dependence of the obtained contributions to the Dst index in relation to the methods used in constructing the models. All models show a significant tail current contribution to the Dst index, comparable to the ring current contribution during moderate storms. The ring current becomes the major Dst source during intense storms.

KW - Magnetospheric physics (Current systems; Magnetospheric configuration and dynamics; Storms and substorms)

UR - http://www.scopus.com/inward/record.url?scp=16244384199&partnerID=8YFLogxK

U2 - 10.5194/angeo-23-523-2005

DO - 10.5194/angeo-23-523-2005

M3 - Article

AN - SCOPUS:16244384199

VL - 23

SP - 523

EP - 533

JO - Annales Geophysicae

JF - Annales Geophysicae

SN - 0992-7689

IS - 2

ER -

ID: 18138030