Rocket Electron Density Perturbations in the Ionosphere

Nature ◽  
1967 ◽  
Vol 214 (5089) ◽  
pp. 690-692
Author(s):  
W. J. G. BEYNON
Keyword(s):  
Electron Density ◽  
Density Perturbations

EISCAT observations of large scale electron temperture and electron density perturbations caused by high power HF radio waves

1992 ◽  
Vol 54 (11-12) ◽  
pp. 1555-1572 ◽  
Author(s):  
A.J. Stocker ◽  
F. Honary ◽  
T.R. Robinson ◽  
T.B. Jones ◽  
P. Stubbe ◽  
...  
Keyword(s):  
Electron Density ◽  
High Power ◽  
Large Scale ◽  
Radio Waves ◽  
Density Perturbations

scholarly journals Decay form of the echo amplitude and echo phase of typical early/fast VLF event on 19.8 kHz signal

2010 ◽  
Vol 28 (1) ◽  
pp. 74
Author(s):  
Abhikesh Kumar ◽  
Sushil Kumar
Keyword(s):  
Theoretical Model ◽  
Electron Density ◽  
Wave Scattering ◽  
Lower Ionosphere ◽  
Exponential Fitting ◽  
Simple Theoretical Model ◽  
Density Perturbations ◽  
Decay Form

In this paper, the echo amplitude (M) and echo phase (ø) of typical early/fast events on NWC (19.8 kHz) signal received at Suva, Fiji, are modelled to determine their form of recovery (decay). We applied logarithmic and exponential fitting formulas for M and ø obtained using a simple theoretical model of VLF wave scattering from lightning-induced electron density perturbations in the lower ionosphere and found that they are highly logarithmic.

scholarly journals One-dimensional computation of discharge-pumped excimer lasers under repetitive operations

1994 ◽  
Vol 12 (4) ◽  
pp. 647-679
Author(s):  
K. Kasuya ◽  
K. Horioka ◽  
N. Hikida ◽  
M. Watanabe ◽  
Y. Kawakita ◽  
...  
Keyword(s):  
Electron Density ◽  
Electrical Discharge ◽  
Energy Input ◽  
Local Density ◽  
Excimer Lasers ◽  
Dimensional Model ◽  
One Dimensional ◽  
Neutral Gas ◽  
Order Of Magnitude ◽  
Density Perturbations

Zero-dimensional numerical computation of electrical discharge-pumped excimer lasers is extended to a one-dimensional model that is used to study the effects of the density perturbations of the background neutral gas and the nonuniform predischarge (which means preionization in this paper) electron density on the transition of the uniform discharge to the nonuniform prestage state leading to the onset of arc formation (which is not included in this particular model). It was found that a local density depression of 1% or an enhancement of the local electric field of 1% can increase the local energy input by several hundred percent. The initial electron density perturbations, on the other hand, are found to modify the energy input by the same order of magnitude as the initial perturbations.

Ionospheric electron density perturbations during the 7–10 March 2012 geomagnetic storm period

2017 ◽  
Vol 59 (4) ◽  
pp. 1041-1056 ◽  
Author(s):  
Anna Belehaki ◽  
Ivan Kutiev ◽  
Pencho Marinov ◽  
Ioanna Tsagouri ◽  
Kostas Koutroumbas ◽  
...  
Keyword(s):  
Electron Density ◽  
Geomagnetic Storm ◽  
Ionospheric Electron Density ◽  
Density Perturbations

White-Light Coronal Structures: Streamers and CMEs

1994 ◽  
Vol 144 ◽  
pp. 82
Author(s):  
E. Hildner
Keyword(s):  
Emission Line ◽  
Electron Density ◽  
White Light ◽  
Coronal Mass Ejections ◽  
X Rays ◽  
Solar Cycles ◽  
Temperature Function ◽  
X Ray ◽  
Eclipse Observations ◽  
Coronal Structures

AbstractOver the last twenty years, orbiting coronagraphs have vastly increased the amount of observational material for the whitelight corona. Spanning almost two solar cycles, and augmented by ground-based K-coronameter, emission-line, and eclipse observations, these data allow us to assess,inter alia: the typical and atypical behavior of the corona; how the corona evolves on time scales from minutes to a decade; and (in some respects) the relation between photospheric, coronal, and interplanetary features. This talk will review recent results on these three topics. A remark or two will attempt to relate the whitelight corona between 1.5 and 6 R⊙to the corona seen at lower altitudes in soft X-rays (e.g., with Yohkoh). The whitelight emission depends only on integrated electron density independent of temperature, whereas the soft X-ray emission depends upon the integral of electron density squared times a temperature function. The properties of coronal mass ejections (CMEs) will be reviewed briefly and their relationships to other solar and interplanetary phenomena will be noted.

Glycogen in guinea pig neutrophils: Ultrastructural study of neutrophils at the intradermal site of BCG injection

1983 ◽  
Vol 41 ◽  
pp. 726-727
Author(s):  
Corazon D. Bucana
Keyword(s):  
Bone Marrow ◽  
Guinea Pig ◽  
Electron Density ◽  
Peritoneal Cavity ◽  
Ultrastructural Study ◽  
Guinea Pigs ◽  
Random Distribution ◽  
Glycogen Content ◽  
Polymorphonuclear Neutrophils ◽  
Ultrastructural Studies

In the circulating blood of man and guinea pigs, glycogen occurs primarily in polymorphonuclear neutrophils and platelets. The amount of glycogen in neutrophils increases with time after the cells leave the bone marrow, and the distribution of glycogen in neutrophils changes from an apparently random distribution to large clumps when these cells move out of the circulation to the site of inflammation in the peritoneal cavity. The objective of this study was to further investigate changes in glycogen content and distribution in neutrophils. I chose an intradermal site because it allows study of neutrophils at various stages of extravasation.Initially, osmium ferrocyanide and osmium ferricyanide were used to fix glycogen in the neutrophils for ultrastructural studies. My findings confirmed previous reports that showed that glycogen is well preserved by both these fixatives and that osmium ferricyanide protects glycogen from solubilization by uranyl acetate.I found that osmium ferrocyanide similarly protected glycogen. My studies showed, however, that the electron density of mitochondria and other cytoplasmic organelles was lower in samples fixed with osmium ferrocyanide than in samples fixed with osmium ferricyanide.

Application of ruthenium red/osmium tetroxide to bacteria, plant and animal tissue

1986 ◽  
Vol 44 ◽  
pp. 54-55
Author(s):  
R. L. Grayson ◽  
N. A. Rechcigl
Keyword(s):  
Electron Microscopy ◽  
Electron Density ◽  
Osmium Tetroxide ◽  
Biological Materials ◽  
Ruthenium Red ◽  
Animal Tissue

Ruthenium red (RR), an inorganic dye was found to be useful in electron microscopy where it can combine with osmium tetroxide (OsO4) to form a complex with attraction toward anionic substances. Although Martinez-Palomo et al. (1969) were one of the first investigators to use RR together with OsO4, our computor search has shown few applications of this combination in the intervening years. The purpose of this paper is to report the results of our investigations utilizing the RR/OsO4 combination to add electron density to various biological materials. The possible mechanisms by which this may come about has been well reviewed by previous investigators (1,3a,3b,4).

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