Improved three-dimensional mapping of the electron density distribution of the solar corona

Solar Physics ◽  
1973 ◽  
Vol 28 (2) ◽  
pp. 435-456 ◽  
Author(s):  
R. Michael Perry ◽  
Martin D. Altschuler
Keyword(s):  
Density Distribution ◽  
Solar Corona ◽  
Electron Density ◽  
Electron Density Distribution ◽  
Three Dimensional ◽  
Three Dimensional Mapping ◽  
Dimensional Mapping

scholarly journals Building brain network in electron density map determined by micro-CT

2014 ◽  
Vol 70 (a1) ◽  
pp. C1752-C1752
Author(s):  
Rino Saiga ◽  
Susumu Takekoshi ◽  
Naoya Nakamura ◽  
Akihisa Takeuchi ◽  
Kentaro Uesugi ◽  
...  
Keyword(s):  
Density Distribution ◽  
Electron Density ◽  
Electron Density Distribution ◽  
Model Building ◽  
Three Dimensional ◽  
Brain Network ◽  
X Ray ◽  
Density Maps ◽  
Density Map ◽  
Electron Density Map

In macromolecular crystallography, an electron density distribution is traced to build a model of the target molecule. We applied this method to model building for electron density maps of a brain network. Human cerebral tissue was stained with heavy atoms [1]. The sample was then analyzed at the BL20XU beamline of SPring-8 to obtain a three-dimensional map of X-ray attenuation coefficients representing the electron density distribution. Skeletonized wire models were built by placing and connecting nodes in the map [2], as shown in the figure below. The model-building procedures were similar to those reported for crystallographic analyses of macromolecular structures, while the neuronal network was automatically traced by using a Sobel filter. Neuronal circuits were then analytically resolved from the skeletonized models. We suggest that X-ray microtomography along with model building in the electron density map has potential as a method for understanding three-dimensional microstructures relevant to biological functions.

Three dimensional atomistic-scale electron density distribution analysis of ZnWO4: Sm phosphors

Optik ◽  
2021 ◽  
pp. 168169
Author(s):  
S. Saravanakumar ◽  
D. Sivaganesh ◽  
V. Sivakumar ◽  
Yang Li ◽  
Rajajeyaganthan Ramanthan ◽  
...  
Keyword(s):  
Density Distribution ◽  
Electron Density ◽  
Electron Density Distribution ◽  
Three Dimensional ◽  
Distribution Analysis

Quantitative Description of the pB and Electron Density Distributions around the Inferred Neutral Line

1994 ◽  
Vol 144 ◽  
pp. 427-430
Author(s):  
M. Guhathakurta
Keyword(s):  
Density Distribution ◽  
Current Sheet ◽  
Electron Density ◽  
Electron Density Distribution ◽  
Neutral Line ◽  
Quantitative Description ◽  
Three Dimensional ◽  
Density Distributions ◽  
Dimensional Distribution

AbstractWe have investigated the three-dimensional distribution of the polarization brightness product (pB) and inferred the electron density distribution relative to the heliographic current sheet during the declining phase of cycle 20 (1973-1976). From the study we observe that the polar and current sheet densities do not vary during the last third of the cycle.

scholarly journals Hectometer and Kilometer Solar Observations

1980 ◽  
Vol 86 ◽  
pp. 405-413
Author(s):  
R. G. Stone
Keyword(s):  
Density Distribution ◽  
Radio Source ◽  
Electron Density ◽  
Electron Density Distribution ◽  
Large Scale ◽  
Three Dimensional ◽  
Dipole Antennas ◽  
Magnetic Field Topology ◽  
Solar Observations ◽  
Field Geometry

Three dimensional “snapshots” of the large scale solar magnetic field topology as well as the solar wind electron density distribution from about 0.1 to 1 AU are obtained by tracking traveling solar radio bursts at hectometer and kilometer wavelengths with instruments aborad the ISEE-3 satellite and the HELIOS-2 solar probe. Both instruments observe in the frequency range from 30 kHz to 1 MHz and both are equipped with dipole antennas located in the vehicle spin plane. ISEE-3 also has a dipole along the spin axis and the signals from the two ISEE-3 antennas are combined to give the azimuth and elevation angles of the radio source. Triangulation between HELIOS-2 and ISEE-3 provides the additional observation necessary to uniquely determine the position of the radio source in space at each observing frequency. The techniques will be outlined, and illustrated by an example of the three dimensional field geometry and electron density distribution determined by the observations.

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