The electron density distribution in the topside ionosphere I. Magnetic-field-alined strata

1964 ◽  
Vol 281 (1387) ◽  
pp. 450-458 ◽  
Keyword(s):  
Magnetic Field ◽  
Density Distribution ◽  
Electron Density ◽  
Electron Probe ◽  
Electron Density Distribution ◽  
Topside Ionosphere ◽  
Electric Permittivity ◽  
Measuring Head ◽  
Flat Disk ◽  
Method Of Measurement

1. The method of measurement of electron density The measurement of the electron density distribution in the topside ionosphere is made by a radio-frequency electron probe which was developed for this satellite. This probe measures the local electric permittivity of the medium in the vicinity of the satellite using a probing frequency of 10 Mc/s and from a knowledge of the permittivity the electron density is readily calculated. The electrodes consist of a pair of flat disk-shaped grids, 4 in. in diameter and spaced 3 1|2 in. apart. These grids are supported on the ends of two short tubes which, in turn, are mounted on a small junction box. This complete unit, which forms the measuring head, is fixed on the end of a retractable boom which extends about 3 ft. from the hull of the satellite. The permittivity is measured in terms of the current that flows between the two electrodes in response to a constant applied signal of 3 V r.m.s. This signal is provided by a 10 Mc/s crystal controlled oscillator, the amplitude being electronically stabilized at the above value.

Modelling the Electron Density Distribution in the July 1991 Solar Corona

1994 ◽  
Vol 144 ◽  
pp. 535-539 ◽  
Author(s):  
F. Clette ◽  
P. Cugnon ◽  
J.-R. Gabryl
Keyword(s):  
Magnetic Field ◽  
Density Distribution ◽  
Electron Density ◽  
Legendre Polynomials ◽  
Electron Density Distribution ◽  
Large Scale ◽  
Symmetry Axis ◽  
Rotation Axis ◽  
Magnetic Field Axis ◽  
The Mean

AbstractUsing intensity and polarization maps computed from white-light observations of the July 11, 1991 solar eclipse, we present axisymmetrical models of the large-scale electron density distribution in the corona. These models are based on an expansion in Legendre polynomials, and are flexible enough to fit individual features, like streamers and holes. Furthermore, as the symmetry axis of our models can take any orientation, we consider two plausible configurations, aligned on the rotation axis or the mean bipolar magnetic field axis. Their respective abilities to reproduce a strongly non-spherical global magnetic structure are then compared.

Electron-density distribution in CuFeS2 as determined by 63,65Cu NMR in an internal magnetic field

2013 ◽  
Vol 80 (3) ◽  
pp. 351-356 ◽  
Author(s):  
A. I. Pogoreltsev ◽  
A. N. Gavrilenko ◽  
V. L. Matukhin ◽  
B. V. Korzun ◽  
E. V. Schmidt
Keyword(s):  
Magnetic Field ◽  
Density Distribution ◽  
Electron Density ◽  
Electron Density Distribution ◽  
Internal Magnetic Field

scholarly journals Equilibrium of a Pinch Discharge with a Transverse Rotating Magnetic Field

1965 ◽  
Vol 18 (4) ◽  
pp. 309 ◽  
Author(s):  
HA Blevin ◽  
RB Miller
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Density Distribution ◽  
Electron Density ◽  
Electron Density Distribution ◽  
Rotating Magnetic Field ◽  
Numerical Examples ◽  
Ionized Plasmas ◽  
Partially Ionized Plasmas ◽  
Partially Ionized

The electron density distribution in a linear pinch discharge with a transverse rotating magnetic field is calculated for partially ionized plasmas. Numerical examples are given for distributions in the plasma with and without externally applied axial magnetic fields, and with different degrees of ionization.

A study on α-RuCl3 crystal structure by scanning tunneling microscopy

1989 ◽  
Vol 47 ◽  
pp. 30-31
Author(s):  
H.-J. Cantow ◽  
H. Hillebrecht ◽  
S. Magonov ◽  
H. W. Rotter ◽  
G. Thiele
Keyword(s):  
Crystal Structure ◽  
Density Distribution ◽  
Scanning Tunneling Microscopy ◽  
Electron Density ◽  
Structure Determination ◽  
Electron Density Distribution ◽  
Scanning Tunneling ◽  
Monoclinic Space Group ◽  
Tunneling Microscopy ◽  
X Ray

From X-ray analysis, the conclusions are drawn from averaged molecular informations. Thus, limitations are caused when analyzing systems whose symmetry is reduced due to interatomic interactions. In contrast, scanning tunneling microscopy (STM) directly images atomic scale surface electron density distribution, with a resolution up to fractions of Angstrom units. The crucial point is the correlation between the electron density distribution and the localization of individual atoms, which is reasonable in many cases. Thus, the use of STM images for crystal structure determination may be permitted. We tried to apply RuCl3 - a layered material with semiconductive properties - for such STM studies. From the X-ray analysis it has been assumed that α-form of this compound crystallizes in the monoclinic space group C2/m (AICI3 type). The chlorine atoms form an almost undistorted cubic closed package while Ru occupies 2/3 of the octahedral holes in every second layer building up a plane hexagon net (graphite net). Idealizing the arrangement of the chlorines a hexagonal symmetry would be expected. X-ray structure determination of isotypic compounds e.g. IrBr3 leads only to averaged positions of the metal atoms as there exist extended stacking faults of the metal layers.

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