scholarly journals Ion velocity distributions in helicon wave plasmas: Magnetic field and pressure effects

1993 ◽  
Vol 11 (6) ◽  
pp. 2046 ◽  
Author(s):  
T. Nakano
Keyword(s):  
Magnetic Field ◽  
Pressure Effects ◽  
Helicon Wave ◽  
Ion Velocity

Effects of Magnetic Field and Ion Velocity on SPT Plasma Sheath Characteristics

2014 ◽  
Vol 16 (2) ◽  
pp. 161-167
Author(s):  
Ping Duan ◽  
Xinwei Zhou ◽  
Yuan Liu ◽  
Anning Cao ◽  
Haijuan Qin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Plasma Sheath ◽  
Ion Velocity

scholarly journals Ion velocity distributions within the LLBL and their possible implication to multiple reconnections

2004 ◽  
Vol 22 (1) ◽  
pp. 213-236 ◽  
Author(s):  
O. L. Vaisberg ◽  
L. A. Avanov ◽  
T. E. Moore ◽  
V. N. Smirnov
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Flux Tube ◽  
Magnetic Flux Tube ◽  
Flux Tubes ◽  
Different Types ◽  
Subsolar Point ◽  
Magnetic Flux Tubes ◽  
Ion Velocity ◽  
Field Lines

Abstract. We analyze two LLBL crossings made by the Interball-Tail satellite under a southward or variable magnetosheath magnetic field: one crossing on the flank of the magnetosphere, and another one closer to the subsolar point. Three different types of ion velocity distributions within the LLBL are observed: (a) D-shaped distributions, (b) ion velocity distributions consisting of two counter-streaming components of magnetosheath-type, and (c) distributions with three components, one of which has nearly zero parallel velocity and two counter-streaming components. Only the (a) type fits to the single magnetic flux tube formed by reconnection between the magnetospheric and magnetosheath magnetic fields. We argue that two counter-streaming magnetosheath-like ion components observed by Interball within the LLBL cannot be explained by the reflection of the ions from the magnetic mirror deeper within the magnetosphere. Types (b) and (c) ion velocity distributions would form within spiral magnetic flux tubes consisting of a mixture of alternating segments originating from the magnetosheath and from magnetospheric plasma. The shapes of ion velocity distributions and their evolution with decreasing number density in the LLBL indicate that a significant part of the LLBL is located on magnetic field lines of long spiral flux tube islands at the magnetopause, as has been proposed and found to occur in magnetopause simulations. We consider these observations as evidence for multiple reconnection Χ-lines between magnetosheath and magnetospheric flux tubes. Key words. Magnetospheric physics (magnetopause, cusp and boundary layers; solar wind-magnetosphere interactions)

Magnetic field and pressure effects in

2005 ◽  
Vol 359-361 ◽  
pp. 272-274 ◽  
Author(s):  
Takao Ebihara ◽  
Tetsuro Takahashi ◽  
Koji Tezuka ◽  
Masato Hedo ◽  
Yoshiya Uwatoko ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Pressure Effects

scholarly journals Bootstrap current and parallel ion velocity in imperfectly optimized stellarators

2020 ◽  
Vol 86 (1) ◽  
Author(s):  
Peter J. Catto ◽  
Per Helander
Keyword(s):  
Magnetic Field ◽  
Kinetic Equation ◽  
Electric Field ◽  
Flow Velocity ◽  
Collision Frequency ◽  
Rotation Frequency ◽  
Radial Electric Field ◽  
Local Form ◽  
Bootstrap Current ◽  
Ion Velocity

A novel derivation of the parallel ion velocity, and the bootstrap and Pfirsch–Schlüter currents in an imperfectly optimized (that is, almost omnigenous) stellarator magnetic field, $\boldsymbol{B}$ , is presented that somewhat more generally recovers expressions completely consistent with previous analytic results. However, it is also shown that, when the conventional radially local form of the drift kinetic equation is employed, the flow velocity and the bootstrap current acquire a spurious contribution proportional to $\unicode[STIX]{x1D714}/\unicode[STIX]{x1D708}$ , where $\unicode[STIX]{x1D714}$ denotes the $\boldsymbol{E}\times \boldsymbol{B}$ rotation frequency (due to the radial electric field $\boldsymbol{E}$ ) and $\unicode[STIX]{x1D708}$ the collision frequency. This contribution is particularly large in the $\sqrt{\unicode[STIX]{x1D708}}$ regime and at smaller collisionalities, where $\unicode[STIX]{x1D714}/\unicode[STIX]{x1D708}\gtrsim 1$ , and is presumably present in most numerical calculations, but it disappears if a more accurate drift kinetic equation is used.

Helicon wave plasma generated by a resonant birdcage antenna: Magnetic field measurements and analysis in the RAID linear device

2021 ◽  
Author(s):  
Philippe Guittienne ◽  
Remy Jacquier ◽  
Basile Pouradier Duteil ◽  
Alan A Howling ◽  
Riccardo Agnello ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Measurements ◽  
Helicon Wave ◽  
Magnetic Field Measurements ◽  
Helicon Wave Plasma
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