Atomic hydrogen density measurements in an ion source plasma using a VUV absorption spectrometer

1988 ◽  
Vol 59 (8) ◽  
pp. 1479-1481 ◽  
Author(s):  
G. C. Stutzin ◽  
A. T. Young ◽  
A. S. Schlachter ◽  
J. W. Stearns ◽  
K. N. Leung ◽  
...  
Keyword(s):  
Atomic Hydrogen ◽  
Ion Source ◽  
Density Measurements ◽  
Hydrogen Density ◽  
Absorption Spectrometer

scholarly journals Atomic hydrogen density measurements in the Tara tandem mirror experiment

1990 ◽  
Vol 2 (9) ◽  
pp. 2168-2172 ◽  
Author(s):  
W. C. Guss ◽  
X. Z. Yao ◽  
L. Pócs ◽  
R. Mahon ◽  
J. Casey ◽  
...  
Keyword(s):  
Atomic Hydrogen ◽  
Density Measurements ◽  
Tandem Mirror ◽  
Hydrogen Density

scholarly journals A High-Velocity Component of Atomic Hydrogen in Comet Bennett (1970 II)

1976 ◽  
Vol 25 (Part1) ◽  
pp. 316-321
Author(s):  
H. U. Keller ◽  
Gary E. Thomas
Keyword(s):  
Radiation Pressure ◽  
Velocity Component ◽  
Atomic Hydrogen ◽  
Orbital Plane ◽  
Field Of View ◽  
Lyman Alpha ◽  
Hydrogen Density ◽  
University Of Colorado ◽  
Alpha Emission ◽  
The University

The Lyman alpha emission from Comet Bennett (1970II) was measured near perihelion (March 1970) by the University of Colorado ultraviolet photometer experiment on OGO-5 The spectrometer field of view of about 3° crossed the cometary hydrogen coma four times. The hydrogen coma was observed to extend more than 30 x 106 km in the antisolar direction.A model for the hydrogen density was developed which took the actual cometary motion and the gradients of the forces of gravitation and radiation pressure into account Exact trajectories of atoms in the orbital plane representing the column densities perpendicular to the plane were calculated. The variation of the hydrogen lifetime along the trajectory as well as the solar Lα profile were considered.

Role of atomic hydrogen density and energy in low power chemical vapor deposition synthesis of diamond films

2005 ◽  
Vol 478 (1-2) ◽  
pp. 77-90 ◽  
Author(s):  
Randell Mills ◽  
Jayasree Sankar ◽  
Andreas Voigt ◽  
Jiliang He ◽  
Paresh Ray ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Low Power ◽  
Vapor Deposition ◽  
Atomic Hydrogen ◽  
Diamond Films ◽  
Chemical Vapor ◽  
Hydrogen Density

Unusually high thermospheric hydrogen density prior to severe storm of September 8, 2017 and its impact on the storm manifestations

2020 ◽  
Author(s):  
Dmytro Kotov ◽  
Philip Richards ◽  
Oleksandr Bogomaz ◽  
Maryna Shulha ◽  
Naomi Maruyama ◽  
...  
Keyword(s):  
Atomic Hydrogen ◽  
Primary Source ◽  
Recovery Phase ◽  
Magnetic Storms ◽  
Geophysical Research ◽  
High Hydrogen ◽  
Severe Storm ◽  
Hydrogen Density ◽  
Quick Recovery ◽  
Current Decay

<p>Atomic hydrogen plays a key role for the plasmasphere, exosphere, and the nighttime ionosphere. It directly impacts the rate of plasmasphere refilling after strong magnetic storms as atomic hydrogen is the primary source of hydrogen ions. It is the source of the geocorona, which significantly affects ring current decay during the recovery phase of magnetic storms.</p><p>Our previous studies with the Kharkiv incoherent scatter radar (49.6 N, 36.3 E), Arase and DMSP satellite missions, and FLIP physical model showed that during magnetically quiet periods of 2016–2018 the hydrogen density was generally a factor of 2 higher than from the NRLMSIS00-E model (Kotov et al., 2018).</p><p>Even larger values of thermospheric hydrogen density were detected prior to the severe storm of September 8, 2017. With Kharkiv IS radar, AWDANet whistler receivers, Arase satellite, and TEC data we found that during the nights of September 5 to 6 and September 6 to 7, the thermospheric hydrogen density had to be at least a factor of 4 higher than the values from NRLMSIS00-E model i.e. ~100% higher than expected from our previous studies. We discuss the possible mechanisms that could lead to the increased hydrogen density.</p><p>Such high hydrogen densities may be the reason for very quick recovery of inner plasmasphere after the severe depletion by the storm of September 8, 2017 (Obana et al., 2019).</p><p><strong>References:</strong></p><p>1. Kotov, D. V., Richards, P. G., Truhlík, V., Bogomaz, O. V., Shulha, M. O., Maruyama, N., et al. ( 2018). Coincident observations by the Kharkiv IS radar and ionosonde, DMSP and Arase (ERG) satellites, and FLIP model simulations: Implications for the NRLMSISE‐00 hydrogen density, plasmasphere, and ionosphere. Geophysical Research Letters, 45, 8062– 8071. https://doi.org/10.1029/2018GL079206</p><p>2. Obana, Y., Maruyama, N., Shinbori, A., Hashimoto, K. K., Fedrizzi, M., Nosé, M., et al. (2019). Response of the ionosphere‐plasmasphere coupling to the September 2017 storm: What erodes the plasmasphere so severely? Space Weather, 17, 861–876. https://doi.org/10.1029/2019SW002168</p>

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