Journal ArticleDOI
Large‐scale, near‐field magnetic fields from external sources and the corresponding induced internal field
Robert A. Langel,R. H. Estes +1 more
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In this paper, the first degree/order spherical harmonic description of the near-Earth external field and its corresponding induced field was analyzed as a function of the Dst index to determine the Sq current in the 45 deg geomagnetic latitude range.Abstract:
Data from MAGSAT analyzed as a function of the Dst index to determine the first degree/order spherical harmonic description of the near-Earth external field and its corresponding induced field. The analysis was done separately for data from dawn and dusk. The MAGSAT data was compared with POGO data. A local time variation of the external field persists even during very quiet magnetic conditions; both a diurnal and 8-hour period are present. A crude estimate of Sq current in the 45 deg geomagnetic latitude range is obtained for 1966 to 1970. The current strength, located in the ionosphere and induced in the Earth, is typical of earlier determinations from surface data, although its maximum is displaced in local time from previous results.read more
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What is a geomagnetic storm
Walter D. Gonzalez,J. A. Joselyn,Yohsuke Kamide,H. W. Kroehl,Gordon Rostoker,Bruce T. Tsurutani,Vytenis M. Vasyliunas +6 more
TL;DR: In this article, an attempt is made to define a geomagnetic storm as an interval of time when a sufficiently intense and long-lasting interplanetary convection electric field leads, through a substantial energization in the magnetosphere-ionosphere system, to an intensified ring current sufficiently strong to exceed some key threshold of the quantifying storm time Dst index.
Journal ArticleDOI
Modeling the dynamics of the inner magnetosphere during strong geomagnetic storms
TL;DR: Tsyganenko et al. as discussed by the authors developed a dynamical model of the storm-time geomagnetic field in the inner magnetosphere, using space magnetometer data taken during 37 major events in 1996-2000 and concurrent observations of the solar wind and interplanetary magnetic field (IMF).
Journal ArticleDOI
The near‐Earth magnetic field at 1980 determined from Magsat data
Robert A. Langel,R. H. Estes +1 more
TL;DR: In this paper, the MAGSAT spacecraft data from November 1979 through April 1980 and from 91 magnetic observatories for 1978 through 1982 were used to derive a spherical harmonic model of the Earth's main magnetic field and its secular variation.
Journal ArticleDOI
Evaluation of the tail current contribution to Dst
TL;DR: In this paper, several disturbed periods are input into Tsyganenko magnetic field models, and an artificial Dst index is computed using the same procedure followed in the actual Dst calculation.
Journal ArticleDOI
A comprehensive model of the quiet‐time, near‐Earth magnetic field: phase 3
TL;DR: In this article, the authors presented a comprehensive model for estimating the near-Earth magnetic field caused by sources in the Earth's core, ionosphere, magnetosphere, and the lithosphere.
References
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Journal ArticleDOI
Average and unusual locations of the Earth's magnetopause and bow shock
TL;DR: The average and unusual locations of magnetopause and bow shock positions observed by IMP spacecraft were analyzed in this paper, showing that the bow shock position is unusual for the Earth's magnetic field.
Journal ArticleDOI
Deformation of the geomagnetic field by the solar wind
TL;DR: In this paper, a simple spherical harmonic description of the distorted field is obtained from the three-dimensional numerical solution to the Chapman-Ferraro problem of a steady solar wind perpendicularly incident upon a dipole field, and a 3D picture of the field line configuration within the magnetosphere is given.
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On the average configuraton of the geomagnetic tail
TL;DR: In this article, the authors used a distribution of 2.5 minute averages of B sub Z as a function of position across the tail to find that more flux crosses the equatorial plane near the dawn and dusk flanks than near midnight.
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Average magnetic field configuration of the outer magnetosphere.
TL;DR: Magnetic field configuration in outer magnetosphere from data obtained by Interplanetary Monitoring Platform /IMP/ was analyzed by as discussed by the authors, where the magnetic field configuration was determined from data collected from the outer magnetosphere of the Earth's magnetosphere.
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On the asymmetric development of magnetic storm fields in low and middle latitudes
S.-I. Akasofu,S. Chapman +1 more
TL;DR: Ring current effects on axisymmetric development of geomagnetic storm fields in low and middle latitudes were studied in this paper, showing that ring current effects have a strong influence on the development of magnetic storm fields.