| Notes from the Stanford Sun-Weather Workshop, 11-15 August 1980. |
DEC 1980 |
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| Authors:
C. Robert Clauer; STANFORD UNIV CA INST FOR PLASMA RESEARCH
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 | A Workshop on solar variability and its relationship to weather and climate was convened at Stanford University on August 11-15, 1980. The purpose of the Workshop was to allow a free exchange of ideas between a group of solar physicists, geophysicists and meteorologists interested in sun-weather relationships. These notes summarize much of the discussion at the Workshop. (Author) |
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| Examination of Time Series through Randomly Broken Windows. |
NOV 1980 |
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| Authors:
P. A. Sturrock; STANFORD UNIV CA INST FOR PLASMA RESEARCH
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| In order to determine the Fourier transform of a quasi-periodic time series (linear problem), or the power spectrum of a stationary random time series (quadratic problem), it is desirable that data be recorded without interruption over a long time interval. In practice, this may not be possible. The effect of regular interruption such as the day/night cycle is well known. We here investigate the effect of irregular interruption of data ... |
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| A Comparison of the Height Distribution of Solar Flare Hard X-Rays in Thick Target and Thermal Models. |
OCT 1980 |
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| Authors:
A. Gordon Emslie; STANFORD UNIV CA INST FOR PLASMA RESEARCH
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| We compute the height structure of hard X-ray bremsstrahlung emission in solar flares for two different models of the bremsstrahlung production; viz. emission from a descending beam of non-thermal electrons, and thermal emission from a coronally confined hot plasma, respectively. It is shown how these two different bremsstrahlung models give rise to hard X-ray spatial distributions which are distinguishable by current instrumentation, and that therefore the models may be distinguished ... |
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| Microwave Radio Emission from Loop Structures in the Solar Chromosphere and Corona. |
OCT 1980 |
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| Authors:
John F. Vesecky; STANFORD UNIV CA INST FOR PLASMA RESEARCH
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| The overall objective of this research is to revisit the slowly varying or S component of solar microwave emission having in hand a much more detailed knowledge of active region structure than was available when the S component was studied extensively in the 1950s and 1960s. In particular we want to consider the radio emission from the active region loop structures so evident in Skylab X-ray and UV images. (Author) ... |
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| Adiabatic and Non-Adiabatic Processes in Thermal Models of Solar Hard X-Ray Bursts. |
SEP 1980 |
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| Authors:
A. Gordon Emslie; STANFORD UNIV CA INST FOR PLASMA RESEARCH
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| The processes by which the observed characteristics of the hard X-ray bremsstrahlung, emitted from a solar flare loop, are modulated, are investigated. This leads us to a set of inversion formulae, giving the behavior of physical variables in terms of observable quantities. The method is applied to recent observational data. (Author) |
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| Discrepancies between Theoretical and Empirical Models of the Flaring Solar Chromosphere and their Possible Resolution. |
AUG 1980 |
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| Authors:
A. Gordon Emslie; John C. Brown; Marcos E. Machado; STANFORD UNIV CA INST FOR PLASMA RESEARCH
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| We compare theoretically and empirically deduced models of the solar chromosphere during flares. Marked discrepancies between these two types of models are noted, and various reasons offered to explain their existence. We develop a new means of testing theoretical heating models by analyzing the net energy loss rates in (observed) empirical atmospheres and inverting the flare energy equation to deduce the parameters of the supposed heating mechanism. (Author) |
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| Origin of the Warped Heliospheric Current Sheet, |
18 MAR 1980 |
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| Authors:
J. M. Wilcox; J. T. Hoeksema; P. H. Scherrer; STANFORD UNIV CA INST FOR PLASMA RESEARCH
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| Doppler Observations of Solar Rotation, |
29 FEB 1980 |
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| Authors:
P. H. Scherrer; J. M. Wilcox; STANFORD UNIV CA INST FOR PLASMA RESEARCH
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| Radiation Signatures from a Locally Energized Flaring Loop, |
21 FEB 1980 |
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| Authors:
A. Gordon Emslie; Loukas Vlahos; STANFORD UNIV CA INST FOR PLASMA RESEARCH
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| Computer Experiments on an Electron Diode. |
JUN 1969 |
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| Authors:
Christopher W. Barnes; D. A. Dunn; STANFORD UNIV CA INST FOR PLASMA RESEARCH
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| The work described in the report is a study of electron beam behavior which lays the foundation for a study of beam interaction with plasmas. The study was started to explore the general problems of beam stopping by a plasma in the hope that a device might be developed which would exploit the beam-plasma interaction phenomenon as a means of efficiently stopping and collecting the spent beam of a high ... |
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| Computer Simulation of a Plasma Accelerator, |
MAY 1969 |
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| Authors:
Velvin Richard Watson; STANFORD UNIV CA INST FOR PLASMA RESEARCH
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| A computer is used to simulate a collisionless plasma in an axisymmetric high specific impulse plasma accelerator with a constant applied electric field and with no applied magnetic field. The collisionless plasma model is shown to be applicable to plasma accelerators that operate with specific impulses in excess of 104 seconds and with particle number densities of the order of 1015 particles/cm3 or less. The computer simulation is accomplished by ... |
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| Investigation of Fast Wave Beam-Plasma Interactions. |
MAR 1969 |
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| Authors:
STANFORD UNIV CA INST FOR PLASMA RESEARCH
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| A program of work is described in which both electrostatic and electromagnetic wave amplifying mechanisms have been investigated. For the former, studies in the absence of a magnetic field were directed towards verifying the theory for beam/surface wave amplification. For the latter, two distinctly different lines were followed for interaction in the presence of a static magnetic field. The first of these was a theoretical and experimental examination of electrostatic ... |
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| Investigation of Fast Wave Beam/Plasma Interactions. |
JAN 1969 |
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| Authors:
STANFORD UNIV CA INST FOR PLASMA RESEARCH
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| The report describes a program of work in which both electrostatic and electromagnetic wave amplifying mechanisms are under investigation. For the former, studies in the absence of a static magnetic field are directed towards verifying the theory for beam/surface wave amplification. Two distinctly different lines are being followed for interactions in the presence of a static magnetic field: Electrostatic cyclotron harmonic wave interaction is being examined, both theoretically and experimentally, ... |
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| An Investigation of Surface Waves and Their Amplification by Beam/Plasma Interaction. |
DEC 1968 |
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| Authors:
V. M. Ristic; STANFORD UNIV CA INST FOR PLASMA RESEARCH
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| An investigation is described of the propagation of surface waves on a plasma column, and their interaction with an electron beam penetrating the plasma. Apart from its basic plasma physics aspects, the study has been carried out with the aim of assessing the potential for application of this mechanism of amplification, and its coupling characteristics. The dispersion relation for plasma surface waves is first examined for several geometries in which ... |
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| Investigation of Fast Wave Beam/Plasma Interactions. |
NOV 1968 |
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| Authors:
STANFORD UNIV CA INST FOR PLASMA RESEARCH
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| This report describes a program of work in which both electrostatic and electromagnetic wave amplifying mechanisms are under investigation. For the former, studies in the absence of a static magnetic field are directed towards verifying the theory for beam/surface wave amplification. Two distinctly different lines are being followed for interactions in the presence of a static magnetic field: Electrostatic cyclotron harmonic wave interaction is being examined, both theoretically and experimentally, ... |
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| EFFECTS OF ELECTRODE TEMPERATURE ON MHD GENERATOR PERFORMANCE, |
JUN 1968 |
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| Authors:
Robert Kessler; STANFORD UNIV CA INST FOR PLASMA RESEARCH
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| Experiments were performed in a combustion-driven MHD generator to determine the effects of electrode temperature and boundary-layer temperature on its performance. The generator was a single electrode pair guarded to avoid end effects by two electrode pairs both upstream and downstream. The five electrode pairs were preceded either by a cold (750 K) water-cooled metal plate or by a hot (2400 K) wall made of magnesium oxide. The electrodes were ... |
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| RF DEFOCUSING OF A SELF-FOCUSED BEAM IN A BEAM-GENERATED PLASMA. |
JUN 1968 |
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| Authors:
Barry W. Stallard; STANFORD UNIV CA INST FOR PLASMA RESEARCH
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| A beam injected into a region containing a low pressure neutral gas (.0001 to .01 Torr) creates a plasma by beam-neutral ionizing collisions. For radial plasma drainage, the equilibrium potential in the plasma decreases monotonically with radius and is a confining well for electrons, thus pinching the beam and confining it to the tube axis for some distance in the plasma. This process is known as ion focusing, or the ... |
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| INVESTIGATION OF FAST WAVE BEAM/PLASMA INTERACTIONS. |
JUN 1968 |
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| Authors:
STANFORD UNIV CA INST FOR PLASMA RESEARCH
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| This report describes a program of work on beam/plasma interaction. Both electrostatic and electromagnetic wave amplifying mechanisms are under investigation. For the former, studies in the absence of a static magnetic field are directed towards verifying the theory for beam/surface wave amplification. Two distinctly different lines are being followed for interactions in the presence of a static magnetic field: Electrostatic cyclotron harmonic wave interaction is being examined, both theoretically and ... |
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| INVESTIGATION OF FAST WAVE BEAM/PLASMA INTERACTIONS. |
MAR 1968 |
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| Authors:
STANFORD UNIV CA INST FOR PLASMA RESEARCH
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| This report describes a program of work on beam/plasma interaction. Both electrostatic and electromagnetic wave amplifying mechanisms are under investigation. For the former, studies in the absence of a static magnetic field are directed towards verifying the theory for beam/surface wave amplification. Two distinctly different lines are being followed for interactions in the presence of a static magnetic field: Electrostatic cyclotron harmonic wave interaction is being examined both theoretically and ... |
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