A Review of the 0.1 Reconnection Rate Problem
... is near 0.1 when normalized to a properly defined reconnecting magnetic field and Alfvén
speed. That this is the case has been known for many years, but developing a theoretical
understanding of why has been extremely challenging.
If we already know the typical rate, why is it important to solve th ...
The Plasma Physics Processes that Drive Ring Current
... Figure 1.3 Atmospheric profile for neutral gas and for ionized gas. .................................... 9
Figure 1.4 Daytime ionospheric and atmospheric composition. ......................................... 10
Figure 1.5 Three-dimensional cutaway view of the magnetosphere.......................... ...
High frequency ion sound waves - Nonlinear Processes in Geophysics
... local type III radio bursts generated in the vicinity of the
spacecraft. The characteristic features of these coherent field
structures are the high intensities and short time scales of
15 to 90 milliseconds (6–27 km); the FES time resolution
is typically 1 ms. Thejappa et al. (1999) show that (1) t ...
Inhomogeneous cloud coverage through the Coulomb explosion of
... In this paper we outline a model to contribute to the understanding of inhomogeneous cloud coverage in substellar atmospheres via the Coulomb explosion of cloud dust particles.
Consider an atmosphere with plasma regions populated with
dust cloud particles. The spatial extent and distribution of the
Interstellar neutral oxygen in a two-shock
... ACR data should provide heliospheric interstellar abundances
on one hand, which can be compared with original interstellar abundances on the other. Because, independently, the ACR
spectral and spatial gradients observations by the outer probes
constrain the shock location (and then the structure of ...
... problem. Neutrino interactions with matter are usually
considered as non self-consistent single particle processes.
We describe neutrino streaming instabilities within
supernovæ plasmas, resulting in longitudinal and transverse
waves using coupled kinetic equations for both neutrinos and
plasma part ...
Development of electric currents in a magnetic field configuration
... associated with the Alfvénic waves corresponds to electric current perturbations according to ∇ × B. Because the plasma motion is mainly horizontal in regions of strong vertical B fields,
the generated currents will be mainly parallel to the magnetic
field. The currents should satisfy ∇ · J = 0, hen ...
... The shear-current dynamo instability depends on the
spatial scaling of the correlation time tðkÞ / km of the
turbulent velocity ﬁeld, where k is the small-scale wave
number. In particular, the shear-current dynamo in a nonconvective turbulence occurs when the exponent mo1. For
the Kolmogorov’s type ...
Exospheres and Atmospheric Escape
... the role of the exosphere on the bow shock position, and, hence, on the plasma flow (Ledvina et al. 2008). They concluded that the variations in the bow shock in going from solar
minimum to maximum could be reproduced. Ma et al. (2002) and Modolo et al. (2005) used
3D MHD and hybrid models respectiv ...
... Vega's lower left is Deneb. Look farther to
Vega's lower right for Altair. The Summer
Triangle will climb higher in early evening all
through the summer, to pose highest
overhead at dusk just as fall begins.
Saturday, June 14
Mars and Spica arrest your eye in the southwest just after dark this week. ...
PHY 380L Introduction to Plasma Physics Richard Fitzpatrick
... they are strongly affected by each others’ electromagnetic fields. Nevertheless,
because the charges are no longer bound, their assemblage becomes capable of
collective motions of great vigor and complexity. Such an assemblage is termed
Of course, bound systems can display extreme complexi ...
Variable Specific Impulse Magnetoplasma Rocket
The Variable Specific Impulse Magnetoplasma Rocket (VASIMR) is an electromagnetic thruster for spacecraft propulsion. It uses radio waves to ionize and heat a propellant, and magnetic fields to accelerate the resulting plasma to generate thrust. It is one of several types of spacecraft electric propulsion systems.The method of heating plasma used in VASIMR was originally developed as a result of research into nuclear fusion. VASIMR is intended to bridge the gap between high-thrust, low-specific impulse propulsion systems and low-thrust, high-specific impulse systems. VASIMR is capable of functioning in either mode. Costa Rican–born American scientist and former NASA astronaut Franklin Chang Díaz created the VASIMR concept and has been working on its development since 1977.VASIMRs units for development and test have been assembled by the Ad Astra Rocket Company, headquartered in the city of Houston, Texas, United States.