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A Review of the 0.1 Reconnection Rate Problem
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 ...
Plasmoid-induced-reconnection and fractal reconnection Kazunari Shibata and Syuniti Tanuma
Plasmoid-induced-reconnection and fractal reconnection Kazunari Shibata and Syuniti Tanuma

Modeling of Intense Laser Driven High Energy Density Plasmas
Modeling of Intense Laser Driven High Energy Density Plasmas

The Plasma Physics Processes that Drive Ring Current
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.......................... ...
- Repository of the Academy`s Library
- Repository of the Academy`s Library

High frequency ion sound waves - Nonlinear Processes in Geophysics
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 ...
Shock structure and ion dynamics
Shock structure and ion dynamics

Inhomogeneous cloud coverage through the Coulomb explosion of
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
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 ...
Chandra HETGS Multiphase Spectroscopy Of The Young
Chandra HETGS Multiphase Spectroscopy Of The Young

NASA SBIR 2015 Phase I Solicitation Science
NASA SBIR 2015 Phase I Solicitation Science

bob_neutrino_EPS04
bob_neutrino_EPS04

... 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
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 ...
Periodic Spectral Line Asymmetries In Solar Coronal Structures From Slow Magnetoacoustic Waves
Periodic Spectral Line Asymmetries In Solar Coronal Structures From Slow Magnetoacoustic Waves

... - Many of the observed propagating disturbances (especially in coronal loops emanating from quiet Sun network and active region plage) do not show evidence of significant quasi-periodic signals. - The wave interpretation was compatible with the lack of strong Doppler shifts. - EIS measurements of in ...
Spectral  and  Hydrodynamic  Modeling  of X-Ray Michael Rosenberg
Spectral and Hydrodynamic Modeling of X-Ray Michael Rosenberg

No Slide Title
No Slide Title

PDF: 154K
PDF: 154K

... 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 ...
NASA/TM—2005–213688 National Aeronautics and Space Administration AD33
NASA/TM—2005–213688 National Aeronautics and Space Administration AD33

Comparative Planetology
Comparative Planetology

3D WHOLE-PROMINENCE FINE STRUCTURE MODELING
3D WHOLE-PROMINENCE FINE STRUCTURE MODELING

Spectroscopic observation of helium-ion- and hydrogen
Spectroscopic observation of helium-ion- and hydrogen

STELLAR ABLATION OF PLANETARY ATMOSPHERES
STELLAR ABLATION OF PLANETARY ATMOSPHERES

Exospheres and Atmospheric Escape
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 ...
NASA-TV Highlights
NASA-TV Highlights

... 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
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 a plasma. Of course, bound systems can display extreme complexi ...
1 2 3 4 5 ... 9 >

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.
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