2 edition of Long-range field aligned echoes from the magnetosphere. found in the catalog.
Long-range field aligned echoes from the magnetosphere.
Warren L. Anderson
Written in English
|The Physical Object|
|Pagination||vii, 74 l.|
|Number of Pages||74|
Geomagnetic field, magnetic field associated with Earth. It is primarily dipolar (i.e., it has two poles, the north and south magnetic poles) on Earth’s surface. Away from the surface the dipole becomes distorted. The field is variable, changing continuously, and its poles migrate over time. A magnetosphere is a region of space surrounding an astronomical object in which charged particles are affected by that object's magnetic field. It is created by a star or planet with an active interior dynamo.. In the space environment close to a planetary body, the magnetic field resembles a magnetic r out, field lines can be significantly distorted by the flow of electrically.
Injection complete Sun contamination Ions drifts earthward in dipolarization E-field faster than they can be replenished from tail convection field Flux increase due to conservation of adiabatic invariance IMAGE Senior Review Presentation • July 9, IMAGE/RPI’s ability to observe ducted echoes makes possible the determination of field. 01/01/01 to 06/30/01 when field aligned echoes are observed from both hemispheres. In this paper we will present the results of parametric studies on the dependence of field aligned echoes on L shell values, MLT (magnetic local time) and Dst. For the observed echoes, we can determine density profiles using field aligned tracing technique.
Evaluating the diffusive equilibrium models: Comparison with the IMAGE RPI field-aligned electron density measurements #SM41C - P. Ozhogin, P. Song, J. Tu, and B. W. Reinisch; Simulation Studies of Long-Range Magnetosphere-Ionosphere Coupling via . Welcome to the realm of extreme and very-low-frequency (ELF/VLF) "Natural Radio!" The WR-3 is an electric-field ("E-field") type of "whistler receiver" specifically designed to monitor naturally-occurring VLF radio emissions of Earth that occur in the , cycles-per-second ( kHz) audio-frequency ELF/VLF radio employs a telescoping whip antenna (BNC-mount) to receive.
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 Long‐range, discrete, radio echo traces observed in the magnetosphere by the Radio Plasma Imager (RPI) on IMAGE have been interpreted as signals guided along geomagnetic field lines. During IMAGE traversals of the plasmapause and near‐equatorial plasmasphere, multiple echo traces, attributed to signals reflected successively between conjugate hemispheres, are often by: 1] Long-range, discrete, radio echo traces observed in the magnetosphere by the Radio Plasma Imager (RPI) on IMAGE have been interpreted as signals guided along geomagnetic field lines.
were attributed primarily to field-aligned propagation [Rein-isch et al., a, b; Carpenter et al., ]. Here we demonstrate the widespread occurrences of these field-aligned echoes throughout the magnetosphere, and discuss the occurrence-frequency implications in terms of guidance by field-aligned electron density irregularities (FAI).
frequency spreading whereas field-aligned echoes tend to appear in discrete traces in plasmagrams and in many cases multiple traces over the same frequency range. Based on direction analysis and the virtual range determination the ray paths of the diffuse and field-aligned echoes of Figure 2a are shown schematically in Figure 2b.
4 Fung et aZ attributed the range spreading of the difise echoes to coherent (aspect- sensitive) scattering fiom field-aligned electron density irregularities (FAI) having.
The diffuse echoes, as shown in Figure 2a, that often accompany the field-aligned echoes observed in RPI plasmagrams can be viewed as corroborating evidence for the presence of field- aligned.
A secondary source of plasma is the ionosphere. Although ionospheric plasma is generally cold and gravitationally bound to the planet, a small fraction can acquire sufficient energy to escape up magnetic field lines and into the magnetosphere.
In some cases, field-aligned potential drops accelerate ionospheric ions and increase the escape rate. In order to determine the mechanism responsible for guiding of long-range discrete echoes observed in the magnetosphere by the RPI, we have performed ray-tracing modeling of discrete echo propagation to investigate the plasma conditions needed to support ducting and wave-guiding by a field-aligned.
The long-range sounder echoes from RPI allow remote sensing of a variety of plasmas structures and boundaries in the magnetosphere. A profile inversion technique for RPI echo traces has been developed and provides a method for determining the density distribution of the plasma from either direct or field-aligned echoes.
A 'field' is a region in which a body experiences a force owing to the presence of other bodies. Earth’s Magnetic Field is one such field. Gravitational fields determine how bodies with mass are attracted to each other.
In electric fields, objects that have an electric charge are attracted or repelled from each other. Magnetic fields determine how electric currents that contain moving. Among these, the field-aligned Ne measurements have provides tremendous scientific advances in understanding ionosphere-magnetosphere coupling.
An empirical model magnetosphere density from Re to 5 Re is under active construction [Nsumei et al., ; Reinisch et al., ; Huang et al., ].
Simple Models of Convection in the Magnetosphere Models for Southward IMF Models for Northward IMF Empirical and Analytic Representations of High-Latitude Convection Observations of Field-Aligned Currents Current Patterns for a Southward IMF Current Patterns for a Northward IMF.
movement of charged particles in the magnetosphere and also elaborated on in his book from • Later confirmed: the Van Allen radiation belt, of field-aligned guided echoes in the plasmaechoes in the plasma-sphere, Journ.
Geophys. Research. Atmospheres Atmospheres, May Syun-Ichi-Akasofu, The Dynamic Aurora, Scientific American, Maypp. Describes the functioning and structure of the magnetosphere and causative factors in the generation of Aurora.
Examines the magnetosphere as an electrical "generator," field-aligned currents, electrojets and substorms, why Aurora are "curtain" shaped. magnetosphere, the frequency range for Jovian magnetospheric sounding (based on realistic spacecraft orbits) is 1 to - kHz.
This frequency range, which partly overlaps that for ionospheric sounding, allows echoes to be received from large distances both across and along field-lines in the Jovian magnetosphere and moon environments.
Long delayed echoes have been heard sporadically from the first observations in and up to our time. Five hypotheses.
Shlionskiy lists 15 possible natural explanations in two groups: reflections in outer space, and reflections within the Earth's magnetosphere. Vidmar. Developed Z mode sounding technique in conjunction with density model optimization to measure field aligned electron density and magnetospheric duct parameters using Z mode : Privatization Engineer at.
distances within the magnetosphere. During soundings of the plasmasphere, direct RPI echoes exhibit various amounts of spreading, from ~ RE to ~2 RE in virtual range (range assuming speed of light propagation). These observations suggest that the plasmasphere is regularly permeated by field-aligned irregularities with scale sizes ranging.
field-aligned propagating waves (ψ ~ 0°) occurring within Ne depletions as small as 1% and less than 10 wavelengths wide. Conjugate field-aligned echoes observed by RPI are most likely due to waveguide ducting with relatively smooth ducts, maintained along the plasmaspheric field lines.
These Z-mode echoes are possible because the Z-mode cutoff frequency, f z, in Equation (5) can have a local minimum leading to a trapping region for Z-mode waves .
An inversion routine was developed to convert the IMAGE/RPI Z-mode echoes into field-aligned N. A magnetosphere is the region around a planet dominated by the planet's magnetic field.
Other planets in our solar system have magnetospheres, but Earth has the strongest one of all the rocky planets: Earth's magnetosphere is a vast, comet-shaped bubble, which has played a .e field-aligned irregularities (FAI) or the ease of sounder- (es) echoes and long-range electromagnetic (em) echoes.
Both appear on the RPI records called plasmagrams which display the IMAGE in the magnetosphere and that additional phenom-ena .(1) Since echoes are generated perpendicular to the density gradient, and the plasma density is presumably distributed uniformly along the magnetic field throughout most of the magnetosphere, except near the ionosphere and in certain other special situations, one can generally assume that echoes originate perpendicular to the magnetic field.