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10 results for “Langmuir Probe”
Multi-Needle Langmuir probe (mNLP) data on the Investigation of Cusp Irregularities (ICI) 4 sounding rocket
<p>Documentation for file: ICI4_mNLP_01112021.mat</p> <p> </p> <ol> <li> <p><strong>The mNLP system on ICI-4</strong></p> </li> </ol> <p>The mNLP system on ICI-4 consisted of four cylindrical Langmuir probes with a diameter of 0.51 mm and a length of 25 mm [1,2]. The instruments allowed for current measurements at a sampling rate of 8680.5 Hz. The mNLP data included in the file are 1) the raw currents (‘I_mnlp’) in which spikes have been removed using a median filter over ten data points, and 2) the “filtered currents” (‘I_mnlp_filt’). For the latter, the spin of the payload and the three first harmonics were removed using a band-pass filter [1,2]. Additionally, components with frequencies larger than 1kHz were also removed.</p> <p> </p> <p> </p> <ol> <li> <p><strong>Variables:</strong></p> </li> </ol> <table> <tbody> <tr> <td> <p>Variable name</p> </td> <td> <p>Units</p> </td> <td> <p>Description/Comment</p> </td> </tr> <tr> <td> <p>time_noNans</p> </td> <td> <p>seconds</p> </td> <td> <p>Time of flight since launch.</p> </td> </tr> <tr> <td> <p>Alt</p> </td> <td> <p>Km</p> </td> <td> <p>Altitude of the payload.</p> </td> </tr> <tr> <td> <p>I_mnlp</p> </td> <td> <p>Ampere</p> </td> <td> <p>Currents obtained by the four cylindrical Langmuir probes. The 1<sup>st</sup>-4<sup>th</sup> columns contain the currents obtained by the probes with bias voltages of 3V, 4.5V, 6V, and 7.5 V, respectively. The data was filtered using a median filter over ten data points.</p> </td> </tr> <tr> <td> <p>I_mnlp_filt</p> </td> <td> <p>Ampere</p> </td> <td> <p>Same as I_mnlp with additional filtering of currents using band-pass filters [1,2].</p> </td> </tr> </tbody> </table> <p> </p> <p><strong>Acknowledgement</strong></p> <p>The mNLP experiment and the ICI-4 campaign were funded through the Research Council of Norway. Thanks to Lasse Clausen, Espen Trondsen, Jøran I. Moen, David Michael Bang-Hauge, Bjørn Lybekk, and the Mechanical Workshop at the University of Oslo, Norway. </p> <p><br> </p> <p>1. Bekkeng, T. A., K. S. Jacobsen, J. K. Bekkeng, A. Pedersen, T. Lindem, J.‐P. Lebreton, and J. I. Moen (2010), Design of a multi‐needle Langmuir probe system, Meas. Sci. Technol., 21, 085,903, doi:10.1088/0957‐0233/21/8/085903</p> <p>2. Jacobsen, K. S., Pedersen, A., Moen, J. I., & Bekkeng, T. A. (2010), A new Langmuir probe concept for rapid sampling of space plasma electron density. Measurement Science and Technology, 21(8), <a href="https://doi.org/10.1088/0957%E2%80%900233/21/8/085902">https://doi.org/10.1088/0957‐0233/21/8/085902</a></p>
Climatology of deep O+ dropouts in the night-time F-region in solar minimum measured by a Langmuir Probe onboard the International Space Station
<p>Dataset contains data pertaining to an accepted JGR Space Physics article of the same name as the dataset. The link to the article is the following: <a href="https://doi.org/10.1029/2022JA030446">https://doi.org/10.1029/2022JA030446</a>. The dataset contains the high level data that were used to generate Figs 2-5 in the aforementioned paper. </p> <p>The observations recorded by ISS FPMU will be uploaded to NASA SPDF as well. A previous dataset already exists in CDAweb under ISS/FPMU. The O+ information will be added with the new upload.</p> <p>For any questions about the data or the tools used to derive the figures from the data, please take a look at the paper <a href="https://doi.org/10.1029/2022JA030446">https://doi.org/10.1029/2022JA030446</a>, or contact Shantanab Debchoudhury at debchous@erau.edu. </p> <p> </p>
Needle Langmuir Probe - guard and boom effects
<p>The dataset includes two distinct simulation setups named "LG_experiment" and "RG_RP_experiment". A detailed explanation of the datasets is given in the article "Effects of Guard and Boom on Needle Langmuir Probes Studied With Particle in Cell Simulations"</p> <p> </p> <p>The naming convention of the included folders is a description of the simulation contained within with the convention following the order: probe length (Lp) probe radius (Rp) length of guard (Lg) guard radius (Rg) probe voltage (Vp) boom voltage (Vb). Each descriptor has a numeric value with three numbers where the last is the first decimal, eg 010 corresponds to 1.0. All lengths are given in Debye Lengths.</p> <p> </p> <p>The LG_experiment is a simulation setup where all parameters are fixed except the guard length, to investigate the effects of the guard length on the cylindrical Langmuir probe.</p> <p> </p> <p>The RG_RP_experiment is a simulation setup where all parameters are fixed except the guard radius, to investigate the effects of the guard radius on the cylindrical Langmuir probe. Two guard radii are included.</p> <p> </p> <p>Each simulation folder contains three data files. The pictetra.hst file which is the history of the probe-guard-boom system. The index values 0,1,2 correspond to the probe,guard and boom respectively. (see the included plot.py). The scc*.vtk files contain surface values on the probe-guard-boom system, and the pictetra*.vtk files contain plasma values through the simulated domain.</p> <p> </p> <p>A minimal python example for plotting the currents is included in the file "plot.py".</p>
Simulations of magnetized Spherical Langmuir probes
<p>Dataset containing Particle-in-Cell simulations of Langmuir probes in magnetized plasma decribed in the paper "Spherical Langmuir probes in magnetized plasma. A model based on Particle-in-Cell simulations". The simulations are done for plasma parameters representative of the lower E-region ionosphere, with probe biases in the electron saturation regime.</p> <p>Each simulation has its own folder denoting the magnetic field strength |B| in Tesla, and probe bias electric potential in Voltage. The folder naming convention uses three digits for numerical values, where the last digit is after the decimal point. i.e "010" is the value 1.0. </p> <p> </p> <p>Plasma parameters used for simulations:</p> <p>Density (e,i) (m−3) 5.9e9<br> Te(K) 1000<br> Ti(K) 1000<br> me(kg) 9.11e-31<br> mi(kg) 4.55e-28</p> <p>The hierarchical structure of the history.xy.h5 files:</p> <p> -current<br> -electrons<br> -dataset<br> -ions<br> -dataset<br> -energy<br> -kinetic<br> -specie 0<br> -specie 1<br> -total<br> -potential<br> -specie 0<br> -specie 1<br> -total<br> -potential<br> -dataset</p> <p>The top-level group "current" is the current to the probe given for electrons and ions. Values are in Ampere. "energy" is the total kinetic and potential energies within the whole simulated domain for electrons (specie 0), ions (specie 1), and both species combined (total). The potential energy is not calculated per species for these simulations, and is therefore set to zero. Values are given in Joule.</p> <p>The top-level group "potential" is the electric potential (bias) of the probe and is given in Volts.</p> <p>Each datapoint is given each 1.5*10^(-9) s, giving it a sampling frequency of 6.67*10^(8) Hz.</p> <p> </p> <p>In addition density data for the whole simulated domain is given in separate H5 files for (rho) electropns, ions, the combined charge density, and (phi) the electric potential. </p> <p> </p> <p>Example python ploting scripts is added for ease of access. </p> <p> </p>
Plasma potential (triangle dots) at 70 mm from the plasma collector and mean energy of electrons (circle dots) obtained from the current-voltage characteristic of the Langmuir probe
<p>Plasma potential (triangle dots) at 70 mm from the plasma collector and mean energy of electrons (circle dots) obtained from the current-voltage characteristic of the Langmuir probe</p>
DE 2 500ms Langmuir Probe (LANG) Te and Ni data
This data set contains electron temperatures and ion densities obtained at 500ms resolution from the DE 2 Langmuir Probe (LANG). Data are available in ASCII from nssdcftp and in CDF format from CDAWeb (as well as CDAWeb plots and lists).
Retrieving true plasma characteristics from Langmuir probes immersed in the spacecraft sheath: The Double Hemispherical Probe technique
<p>Supplemental material for JGR publication.</p>
Simple langmuir probe measurements and Vmec equilibrium for the SCR-1 stellarator
Open the record for dataset details and reuse information.
CASSINI SS/S RPWS DERIVED LANGMUIR PROBE SWEEP V1.0
The Cassini Radio and Plasma Wave Science (RPWS) Langmuir Probe Sweep data set includes all thermal plasma information derived from Langmuir Probe voltage sweeps acquired in the inner magnetosphere and during Titan, Enceladus, and other icy satellite encounters for the entire Cassini mission. The submitted data set includes electron density, electron temperature, and spacecraft potential, and is intended to become the most comprehensive and complete data set of thermal plasma parameters derived from the Langmuir Probe voltage sweeps in these regions included in the Cassini RPWS archive. Data are presented in tables with fixed-length records for ease in data handling. A browse data set of PNG images is included, providing a graphical summary of the data for each inner magnetosphere pass or moon encounter.
CASSINI SS/S RPWS DERIVED LANGMUIR PROBE SWEEP V1.0
The Cassini Radio and Plasma Wave Science (RPWS) Langmuir Probe Sweep data set includes all thermal plasma information derived from Langmuir Probe voltage sweeps acquired in the inner magnetosphere and during Titan, Enceladus, and other icy satellite encounters for the entire Cassini mission. The submitted data set includes electron density, electron temperature, and spacecraft potential, and is intended to become the most comprehensive and complete data set of thermal plasma parameters derived from the Langmuir Probe voltage sweeps in these regions included in the Cassini RPWS archive. Data are presented in tables with fixed-length records for ease in data handling. A browse data set of PNG images is included, providing a graphical summary of the data for each inner magnetosphere pass or moon encounter.
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