scholarly journals A statistical analysis of heliospheric plasma sheets, heliospheric current sheets, and sector boundaries observed in situ by STEREO

2014 ◽  
Vol 119 (11) ◽  
pp. 8721-8732 ◽  
Author(s):  
Y. C.-M. Liu ◽  
J. Huang ◽  
C. Wang ◽  
B. Klecker ◽  
A. B. Galvin ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Current Sheets ◽  
Plasma Sheets

scholarly journals Statistical Analysis of the Main Ionospheric Trough Using Swarm in Situ Measurements

2020 ◽  
Vol 125 (3) ◽  
Author(s):  
Ercha Aa ◽  
Shasha Zou ◽  
Philip J. Erickson ◽  
Shun‐Rong Zhang ◽  
Siqing Liu
Keyword(s):  
Statistical Analysis ◽  
In Situ Measurements ◽  
Main Ionospheric Trough

The measurement of groundwater temperature in shallow piezometers and standpipes

2005 ◽  
Vol 42 (5) ◽  
pp. 1377-1390 ◽  
Author(s):  
Matthew D Alexander ◽  
Kerry TB MacQuarrie
Keyword(s):  
Finite Element ◽  
Statistical Analysis ◽  
Transport Model ◽  
Shallow Groundwater ◽  
Subsurface Temperature ◽  
Groundwater Temperature ◽  
Monitoring Well ◽  
Laboratory Results ◽  
The Impact

Accurate measurements of in situ groundwater temperature are important in many groundwater investigations. Temperature is often measured in the subsurface using an access tube in the form of a piezometer or monitoring well. The impact of standpipe materials on the conduction of heat into the subsurface has not previously been examined. This paper reports on the results of a laboratory experiment and a field experiment designed to determine if different standpipe materials or monitoring instrument configurations preferentially conduct heat into the shallow sub surface. Simulations with a numerical model were also conducted for comparison to the laboratory results. Statistical analysis of the laboratory results demonstrates that common standpipe materials, such as steel and polyvinylchloride (PVC), do not affect temperature in the subsurface. Simulations with a finite element flow and heat transport model also confirm that the presence of access tube materials does not affect shallow groundwater temperature measurements. Field results show that different instrument configurations, such as piezometers and water and air filled and sealed well points, do not affect subsurface temperature measurements.Key words: groundwater temperature, temperature measurement, conduction, piezometers, piezometer standpipes, thermal modelling.

Interplanetary dust observations with the Solar Orbiter RPW instrument: a first year of data.

2021 ◽  
Author(s):  
Arnaud Zaslavsky ◽  
Ingrid Mann ◽  
Stuart Bale ◽  
Andrzej Czechowski ◽  
Karine Issautier ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Interstellar Dust ◽  
Plasma Waves ◽  
Interplanetary Dust ◽  
First Year ◽  
Voltage Waveform ◽  
Dust Density ◽  
Spacecraft Trajectory ◽  
Impact Data

<p>Impacts of dust grains on spacecraft are known to produce typical impulsive signals in the voltage waveform recorded at the terminals of electric antennas. Such signals are, as could be expected, routinely detected by the radio and plasma waves (RPW) instrument aboard Solar Orbiter, therefore providing in-situ measurements of the interplanetary dust density along the spacecraft trajectory.<br><br>We present a statistical analysis of the first year and half of dust impact data recorded by Solar Orbiter RPW between 1 AU and 0.5 AU. We discuss the results in terms of constraints that can be put on beta-meteoroids and interstellar dust fluxes, and compare them to results obtained by STEREO at 1 AU and more recently by Parker Solar Probe at 0.5 AU.</p>

Transport of energetic particles from reconnecting current sheets in flaring corona to the heliosphere

2021 ◽  
Author(s):  
Philippa Browning ◽  
Mykola Gordovskyy ◽  
Satashi Inoue ◽  
Eduard Kontar ◽  
Kanya Kusano ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Energetic Particles ◽  
Transport Processes ◽  
Data Driven ◽  
Current Sheets ◽  
Electrons And Ions ◽  
Data Driven Approach ◽  
Particle Simulations ◽  
The Magnetic Field

<p>In this study, we inverstigate the acceleration of electrons and ions at current sheets in the flaring solar corona, and their transport into the heliosphere. We consider both generic solar flare models and specific flaring events with a data-driven approach. The aim is to answer two questions: (a) what fraction of particles accelerated in different flares can escape into the heliosphere?; and (b) what are the characteristics of the particle populations propagating towards the chromosphere and into the heliosphere?</p><p>We use a combination of data-driven 3D magnetohydrodynamics simulations with drift-kinetic particle simulations to model the evolution of the magnetic field and both thermal and non-thermal plasma and to forward-model observable characteristics. Particles are accelerated in current sheets associated with flaring reconnection. When applied to a specific flare, the model successfully predicts observed features such as the location and relative intensity of hard X-ray sources and helioseismic source locations. This confirms the viability of the approach.</p><p>Using these MHD-particle models, we will show how the magnetic field evolution and particle transport processes affect the characteristics of both energetic electrons and ions in the the inner corona and the heliosphere. The implications for interpretation of in situ measurements of energetic particles by Solar Orbiter and Parker Solar Probe will be discussed.</p><p> </p><p> </p>

Public Perceptions on the Use of Oil Spill Response Methods in Alaskan Waters and the Level of Trust in Organizations to Prevent Oil Spills

2003 ◽  
Vol 2003 (1) ◽  
pp. 349-352
Author(s):  
Leslie A. Pearson
Keyword(s):  
Statistical Analysis ◽  
Oil Spill ◽  
Mechanical Response ◽  
State Legislature ◽  
Coast Guard ◽  
Seasonal Abundance ◽  
Commercial Fishing ◽  
Prince William Sound ◽  
Cook Inlet

ABSTRACT All of the cleanup methods available for responding to a marine oil spill in Alaska have operational limitations. In Prince William Sound and Cook Inlet, non-mechanical response methods such as the use of chemical dispersants or in situ burning can be requested as secondary cleanup options. This study identifies citizens’ concern and determines the preference of response methods and perceived effectiveness of each method. Environmental risks, values, and the level of trust residents in communities of Prince William Sound and Cook Inlet are also examined., A correlational research design was used to answer research questions with survey data collected by randomly sampling 1657 residents in fifteen communities of Prince William Sound and Cook Inlet. Of the 1657 surveys mailed a response rate of 41% was obtained. Descriptive and inferential statistical analyses were used to analyze the survey information. General descriptive statistical analysis was used to examine responses to each statement in the survey. Inferential statistical analysis was used to quantify the direction and strength of a relationship between variables., In general, 92% of the respondents support the use of mechanical recovery methods, 61% support the use of in situ burning and 45% chemical dispersants. The population recognizes burning as a means of removing large quantities of oil from the sea surface and the environmental risk of displacing pollutants into the atmosphere. Environmental concerns associated with the use of chemical dispersants are tied to seasonal abundance of and impact to marine organisms, amount of area and subsistence use and dependency on marine resources., The survey population's ecological priorities are commercial fishing, sea mammals and sea birds. The U.S. Coast Guard and Commercial Fishing Associations are held to the highest level of trust while the Alaska State Legislature and U.S. Congress received the lowest level of trust for ensuring Alaska waters remain oil free.

Audit of histomorphology and immunohistochemistry of the brain tumors: Revisited in context to the WHO 2016 molecular classification

2017 ◽  
Vol 2 (1) ◽  
pp. 15
Author(s):  
Tanushri Mukherjee ◽  
Rajat Dutta ◽  
Joydeep Ghosh
Keyword(s):  
Social Sciences ◽  
Statistical Analysis ◽  
Brain Tumors ◽  
Molecular Classification ◽  
Histopathological Diagnosis ◽  
Treatment Change ◽  
Tumor Patients ◽  
The Brain

<p><span class="Bold">Background:</span><span> The WHO 2016 molecular classification corroborating with the histology has given more significant diagnostic objectivity to the diagnosis of brain tumors and it is more reliable for instituting therapy as the heterogeneity and observer subjectivity are bypassed with the addition of isocitrate dehydrogenase, ATRX, and 1p19q, and other molecular markers. </span><span class="Bold">Aim:</span><span> Our aim is to review the histopathology of diagnosed brain tumors and correlate with immunohistochemical (IHC) findings to note for any disparity to reform the diagnosis in order to benefit the patient and report to the clinician if any treatment change is to be considered. </span><span class="Bold">Materials and Methods:</span><span> This article is based on studies of screening and diagnostic test. A total of 150 brain tumors were retrospectively analyzed. Age, gender, and the tumor histological type and grade were systematically recorded. We compared our histopathological diagnosis before the introduction of the WHO 2016 molecular classification of central nervous system tumors and later after the relevant IHC and fluorescence </span><span class="Italic">in situ</span><span> hybridization studies. </span><span class="Bold">Statistical Analysis:</span><span> The statistical analysis was done by using Statistical Package for Social Sciences version recent for Windows. </span><span class="Bold">Results:</span><span> Out of the total 150 brain tumor patients, 65 were males and 45 were females. About 37 were glial and the rest were in other categories. </span><span class="Bold">Conclusions:</span><span> </span><span lang="en-US">The molecular diagnosis that substantiated with the histomorphology is more objective and beneficial in the treatment of the patients.</span></p>

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