A diffusion model for the electron density distribution along the Earth's magnetic field in an F-region plasma cloud

1973 ◽  
Vol 35 (4) ◽  
pp. 795-803
Author(s):  
P.B. Rao
Keyword(s):  
Magnetic Field ◽  
Density Distribution ◽  
Electron Density ◽  
Diffusion Model ◽  
Electron Density Distribution ◽  
Plasma Cloud ◽  
Earth’S Magnetic Field ◽  
F Region ◽  
Earth's Magnetic Field ◽  
Region Plasma

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.

scholarly journals On the factors controlling occurrence of F-region coherent echoes

2002 ◽  
Vol 20 (9) ◽  
pp. 1385-1397 ◽  
Author(s):  
D. W. Danskin ◽  
A. V. Koustov ◽  
T. Ogawa ◽  
N. Nishitani ◽  
S. Nozawa ◽  
...  
Keyword(s):  
Density Distribution ◽  
Radio Wave ◽  
Electron Density ◽  
Electron Density Distribution ◽  
Propagation Path ◽  
Occurrence Rate ◽  
Wave Refraction ◽  
F Region ◽  
D Region ◽  
Field Lines

Abstract. Several factors are known to control the HF echo occurrence rate, including electron density distribution in the ionosphere (affecting the propagation path of the radar wave), D-region radio wave absorption, and ionospheric irregularity intensity. In this study, we consider 4 days of CUTLASS Finland radar observations over an area where the EISCAT incoherent scatter radar has continuously monitored ionospheric parameters. We illustrate that for the event under consideration, the D-region absorption was not the major factor affecting the echo appearance. We show that the electron density distribution and the radar frequency selection were much more significant factors. The electron density magnitude affects the echo occurrence in two different ways. For small F-region densities, a minimum value of 1 × 1011 m-3 is required to have sufficient radio wave refraction so that the orthogonality (with the magnetic field lines) condition is met. For too large densities, radio wave strong "over-refraction" leads to the ionospheric echo disappearance. We estimate that the over-refraction is important for densities greater than 4 × 1011 m-3. We also investigated the backscatter power and the electric field magnitude relationship and found no obvious relationship contrary to the expectation that the gradient-drift plasma instability would lead to stronger irregularity intensity/echo power for larger electric fields.Key words. Ionosphere (ionospheric irregularities; plasma waves and instabilities; auroral ionosphere)

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.

The distribution of electrons in the undisturbed F 2 later of the ionosphere

1956 ◽  
Vol 248 (956) ◽  
pp. 609-620 ◽  
Keyword(s):  
Magnetic Field ◽  
Electron Density ◽  
Earth’S Magnetic Field ◽  
Cavendish Laboratory ◽  
Sunspot Maximum ◽  
Earth's Magnetic Field ◽  
Bona Fide

h'(f) curves recorded at Watheroo, Huancayo and Slough near midwinter, midsummer and equinox in years of sunspot maximum and minimum were analyzed so as to provide N(h) curves'which show the electron density (N) as a function of the height ( . The method of analysis is described and its limitations are discussed. The earth’s magnetic field has been neglected in the calculations; although this may lead to an error in some of the actual heights quoted, it should not cause appreciable error in the variation of those heights. Curves for the ‘international magnetically quietest days’ in each of the months analyzed are considered, and it is shown how, by a process of averaging, it is possible to deduce the form of a ‘mean quiet Flayer’. This represents the basic behaviour of the region on magnetically quiet days without those details which are peculiar to any one day. The resulting ‘ mean quiet F layers ’ are described in a series of curves. The detailed results, in tabulated form, are available from the Cavendish Laboratory for bona fide research workers.

Triple splitting and z-rays in polar ionograms

2015 ◽  
Vol 27 (4) ◽  
pp. 383-387 ◽  
Author(s):  
Carlo Scotto
Keyword(s):  
Magnetic Field ◽  
Refractive Index ◽  
Electron Density ◽  
Density Profile ◽  
Electron Density Profile ◽  
Earth’S Magnetic Field ◽  
Earth's Magnetic Field ◽  
Group Refractive Index ◽  
Ray Trace

AbstractThe theory of propagation in a direction almost parallel to the Earth’s magnetic field is reviewed, calculating the group refractive index of the ordinary ray in the presence of electron-neutral collisions. An electron density profile is estimated from the ordinary trace and is used to compute the z-ray trace. It is shown that this reconstruction can help to identify the rare cases of z-rays from among the numerous cases of duplicate ordinary traces, due to reflection from two different directions.

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.

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