Boundary-layer ion density profiles as measured by electrostatic probes

1966 ◽  
Author(s):  
H. BREDFELDT ◽  
H. GUTHART ◽  
T. MORITA
Keyword(s):  
Boundary Layer ◽  
Density Profiles ◽  
Ion Density

Boundary-layer ion density profiles as measured by electrostatic probes.

AIAA Journal ◽  
1967 ◽  
Vol 5 (1) ◽  
pp. 91-98 ◽  
Author(s):  
H. R. BREDFELDT ◽  
W. E. SCHARFMAN ◽  
H. GUTHART ◽  
T. MORITA
Keyword(s):  
Boundary Layer ◽  
Density Profiles ◽  
Ion Density

On the possibility of determining the sawtooth location from impurity ion density profiles

1995 ◽  
Vol 66 (1) ◽  
pp. 505-507 ◽  
Author(s):  
D. Kh. Morozov ◽  
V. A. Rantsev‐Kartinov
Keyword(s):  
Density Profiles ◽  
Ion Density ◽  
Impurity Ion

Seed-Atom Density Profiles in a Boundary Layer on a Flat Plate in MHD Combustion Gas Plasmas

1988 ◽  
Vol 27 (Part 1, No. 12) ◽  
pp. 2360-2367 ◽  
Author(s):  
Tomoaki Ikegami ◽  
Takahide Matsuo ◽  
Kazunori Oniki ◽  
Mitsuharu Masuda ◽  
Yukio Watanabe ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Flat Plate ◽  
Density Profiles ◽  
Combustion Gas ◽  
Atom Density

Measurement of sheath characteristics in the presence of convection and ionization

1996 ◽  
Vol 74 (9-10) ◽  
pp. 671-675 ◽  
Author(s):  
R. M. Clements ◽  
J. R. Dawe ◽  
S. A. H. Rizvi ◽  
P. R. Smy
Keyword(s):  
Boundary Layer ◽  
Plasma Electron ◽  
Experimental Results ◽  
Ion Density ◽  
Current Voltage ◽  
Planar Grid ◽  
Theoretical Predictions ◽  
Flame Plasma ◽  
Theoretical Paper ◽  
Good Agreement

A flame plasma whose electron and (or) ion density can be varied over several orders of magnitude is constrained to flow perpendicular to a planar grid Langmuir probe. The probe is biased negative to the plasma, and the current–voltage characteristics and the thickness of the ion sheath formed at the probe are measured. The level of the electron and (or) ion density is set within a range at which the probe current due to thermal ionization throughout the sheath is comparable with the current of ions convected into the sheath. The experimental results are compared with the predictions of a recent theoretical paper that calculates the effect of recombination upon the characteristics of planar, cylindrical, and spherical probes with boundary layer sheaths. The theoretical predictions and experimental results for an idealized planar configuration show good agreement over wide ranges of variation of probe bias and plasma electron and (or) ion density. This verification of the theoretical planar electrode – perpendicular-flow model, which is the basis for all three boundary layer relations, is seen as providing strong backing for these relations, which have application to ionization measurements in various forms of recombinant plasma.

Seismo-ionospheric precursors of the 14 November 2019 M7.1 Indonesia Earthquake detected by FORMOSAT-7/COSMIC-2

2020 ◽  
Author(s):  
Jann-Yenq Liu ◽  
Chi-Yen Lin ◽  
Fu-Yuan Chang ◽  
Yuh-Ing Chen
Keyword(s):  
Electron Density ◽  
Electric Fields ◽  
Radio Occultation ◽  
Electron Content ◽  
Ion Temperature ◽  
Density Profiles ◽  
Ion Density ◽  
Total Electron ◽  
Ion Velocity ◽  
Electron Density Profiles

<p>FORMOSAT-7/COSMIC-2 (F7/C2), with the mission orbit of 550 km altitude, 24-deg inclination, and a period of 97 minutes, was launched on 25 June 2019.  Tri-GNSS Radio occultation System (TGRS), Ion Velocity Meter (IVM), and RF beacon onboard F7/C2 six small satellites allow scientists to observe the plasma structure and dynamics in the mid-latitude, low-latitude, and equatorial ionosphere in detail.  F7/C2 TGRS sounds ionospheric RO (radio occultation) electron density profiles, while F7/C2 IVM probes the ion density, ion temperature, and ion velocity at the satellite altitude.  The F7/C2 electron density profiles and the ion density, ion temperature, and ion velocity, as well as the global ionospheric map (GIM) of the total electron content (TEC) derived from global ground-based GPS receivers are used to detect seismo-ionospheric precursors (SIPs) of the 14 November 2019 M7.1 Indonesia Earthquake.  The GIM TEC and F7/C2 RO NmF2 significantly increase specifically over the epicenter on 25-26 October, which indicates SIPs of the 14 November 2019 M7.1 Indonesia Earthquake being detected.  The F7/C2 RO electron density profiles upward motions suggest that the eastward electric fields have been enhanced during the SIP days of the 2019 M7.1 Indonesia earthquake.  The seismo-generated electric fields of the 2019 M7.1 Indonesia earthquake are 0.34-0.64 mV/m eastward.  The results demonstrate that F7/C2 can be employed to detect SIPs in the ionospheric plasma, which shall shed some light on earthquake prediction/forecast.</p>

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