Journal ArticleDOI
Quantitative simulation of a magnetospheric substorm 2. Comparison with observations
M. Harel,Richard A. Wolf,R. W. Spiro,Patricia H. Reiff,C.-K. Chen,W. J. Burke,Frederick J. Rich,M. Smiddy +7 more
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TLDR
In this article, results of the computer simulation of the inner magnetosphere during the substorm-type event of September 19, 1976, are discussed, and three general features on which the model and observations are in good agreement are (1) the magnitude and direction of the high-latitude electric field, (2) the degree to which the lowlatitude ionosphere is shielded from the highlatitude convection electric field and (3) the fact that the poleward electric field on the duskside is significantly larger, on the average, than the equatorAbstract:
Results of the computer simulation of the behavior of the inner magnetosphere during the substorm-type event of September 19, 1976, are discussed. The computed electric fields are found to compare satisfactorily with electric fields measured from S3-2, although there are detailed differences. The three general features on which the model and observations are in good agreement are (1) the magnitude and direction of the high-latitude electric field, (2) the degree to which the low-latitude ionosphere is shielded from the high-latitude convection electric field, and (3) the fact that the poleward electric field on the duskside is significantly larger, on the average, than the equatorward electric field on the dawnside. Simple formulas are presented that give rough estimates of global Joule heating rates from observable parameters.read more
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Journal ArticleDOI
Quantitative simulation of a magnetospheric substorm 1. Model logic and overview
M. Harel,Richard A. Wolf,Patricia H. Reiff,R. W. Spiro,W. J. Burke,Frederick J. Rich,M. Smiddy +6 more
TL;DR: In this article, a comprehensive computer simulation of the behavior of the earth's inner magnetosphere during a substorm-type event is reported, where the basic equations of the model are derived, and the inputs are described.
Journal ArticleDOI
Statistical and functional representations of the pattern of auroral energy flux, number flux, and conductivity
TL;DR: In this article, the global maps of the integral energy flux, integral number flux, and height-integrated Hall and Pedersen conductivities at each level of Kp were fit using both spherical harmonic and Epstein functions.
Journal ArticleDOI
Average characteristics and activity dependence of the subauroral polarization stream
John C. Foster,H. B. Vo +1 more
TL;DR: In this article, the authors examined the occurrence and characteristics of a persistent secondary westward convection peak which lies equatorward of the auroral two-cell convection, and identified the latitudinally broad and persistent subauroral polarization stream (SAPS) which spans the nightside from dusk to the early morning sector for all Kp greater than 4.
Journal ArticleDOI
The driving of the plasma sheet by the solar wind
TL;DR: In this paper, the coupling of the plasma sheet to the solar wind was studied statistically using measurements from various satellite pairs: one satellite in the sun and one in either the magnetotail central plasma sheet or the near-Earth plasma sheet.
Journal ArticleDOI
SAPS: A new categorization for sub‐auroral electric fields
John C. Foster,William J. Burke +1 more
TL;DR: The continued use of descriptive terms such as penetration electric fields, polarization jets, and sub-auroral ion drifts could lead to misunderstanding, especially when comparing the broad/narrow, persistent/transient regions of sub- auroral electric field and plasma flow.
References
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Journal ArticleDOI
Large‐scale characteristics of field‐aligned currents associated with substorms
T. Iijima,T. A. Potemra +1 more
TL;DR: In this paper, the authors determined the statistical features of field-aligned currents during a large number of substorms from the magnetic field observations acquired with the Triad satellite, including the following: (1) the large-scale regions of fieldaligned currents determined previously by the authors (Iijima and Potemra, 1976a) persist during all phases of sub-storm activity, namely, region 1, located near the poleward boundary of the fieldaligned current region, and region 2, positioned near the equatorward boundary.
Journal ArticleDOI
A study of geomagnetic storms
Paul Perreault,Syun-Ichi Akasofu +1 more
TL;DR: In this paper, the interplanetary energy flux is estimated on the basis of the Poynting flux and its variations with the rate of energy dissipation in terms of: (1) the ring-current particle injection, (2) Joule dissipation, and (3) auroral particle injection for 15 major geomagnetic storms.
Journal ArticleDOI
Plasma clouds in the magnetosphere.
S. E. DeForest,Carl E. McIlwain +1 more
TL;DR: Magnetospheric plasma clouds equatorial observation by ATS 5 satellite, revealing plasma injection during substorms and dispersion by earth magnetic and electric fields as mentioned in this paper, revealed plasma injection in the Earth magnetic field.
Journal ArticleDOI
Dependence of polar cap potential drop on interplanetary parameters
TL;DR: In this article, the convection potential drop across the polar cap is computed from data obtained on high-inclination low-altitude satellites and the potential measurements are correlated with various combinations of parameters measured simultaneously in the upstream solar wind.
Journal ArticleDOI
Self‐consistent calculation of the motion of a sheet of ions in the magnetosphere
R. K. Jaggi,R. A. Wolf +1 more
TL;DR: In this paper, the effects of Birkeland currents from the inner edge of a sheet of ions that moves under the influence of the computed electric fields were investigated, and the results of the model calculations support the idea that convection electric fields bring low-energy ions in from the tail to form the storm time ring current.
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