Observations of the disturbed region around an ionospheric spacecraft

Henderson, C.; Samir, Uri

doi:10.1016/0032-0633(67)90083-9

Cited by 47 publications

(26 citation statements)

References 12 publications

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“…[for an account see Henderson and Samir (1967)]. Of these one which gives a simple physical picture and results which are in excellent agreement with obser vations is that due to Gurevich (1962).…”

Section: (C) Collisionsmentioning

confidence: 60%

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Electron and ion temperatures in the ionosphere

Willmore

1970

Space Sci Rev

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Section: (C) Collisionsmentioning

confidence: 60%

“…The Ariel I wake has been extensively investigated [ Samir and Willmore (1965), Henderson and Samir (1967)] and shown to conform to this picture. Figure 5 shows the electron density depletion observed.…”

Section: (C) Collisionsmentioning

confidence: 96%

Electron and ion temperatures in the ionosphere

Willmore

1970

Space Sci Rev

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“…26 In addition to fusion plasmas, plasma-limiter interactions bear on plasma probe operation, 27 microstructure resolution of substrates in semiconductor device manufacture, and on space plasmas. Plasma wakes have been observed around planets, natural and artificial satellites, [28][29][30][31][32][33][34] and they have been investigated in the vicinity of the U.S. Space Shuttle. 35 The present experiment examines the filling of the near wake in the presence of large-amplitude, low-frequency ( f р50 kHz) turbulence generated near an obstacle as plasma flows around it.…”

Section: Introductionmentioning

confidence: 99%

Ion acceleration and anomalous transport in the near wake of a plasma limiter

1997

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Ion acceleration and anomalous transport were studied experimentally in the near wake region of an electrically floating disk limiter immersed in two different types of collisionless, supersonically flowing, magnetized plasmas: the first initially quiescent, the second initially turbulent. Ion densities and velocity distributions were obtained using a nonperturbing laser induced fluorescence diagnostic. Large-amplitude, low-frequency turbulence was observed at the obstacle edge and in the wake. Rapid ion and electron configuration space transport and ion velocity space transport were observed. Configuration space and velocity space transport were similar for both quiescent and turbulent plasma-obstacle systems, suggesting that plasma-obstacle effects outweigh the effects of initial plasma turbulence levels.

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“…Singh et al (1987) and Samir et al (2001) demonstrated that the electrons and ions are heated in the wake, while Siskind et al (1984) also observed an electron heating in the ram direction. Henderson and Samir (1967) measured the current depletion in the wake with respect to the ram and Samir et al (1979 studied the asymmetry in the current distribution in the wake. Oran et al (1974) observed the increasing of the density in the near-wake region.…”

Section: Introductionmentioning

confidence: 99%

The spherical segmented Langmuir probe in a flowing thermal plasma: numerical model of the current collection

Seran¹,

Berthelier²,

Saouri³

et al. 2005

Ann. Geophys.

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Abstract. The segmented Langmuir probe (SLP) has been recently proposed by one of the authors (Lebreton, 2002) as an instrument to derive the bulk velocity of terrestrial or planetary plasmas, in addition to the electron density and temperature that are routinely measured by Langmuir probes. It is part of the scientific payload on the DEMETER microsatellite developed by CNES. The basic concept of this probe is to measure the current distribution over the surface using independent collectors under the form of small spherical caps and to use the angular anisotropy of these currents to obtain the plasma bulk velocity in the probe reference frame. In order to determine the SLP capabilities, we have developed a numerical PIC (Particles In Cell) model which provides a tool to compute the distribution of the current collected by a spherical probe. Our model is based on the simultaneous determination of the charge densities in the probe sheath and on the probe surface, from which the potential distribution in the sheath region can be obtained. This method is well adapted to the SLP problem and has some advantages since it provides a natural control of the charge neutrality inside the simulation box, allows independent mesh sizes in the sheath and on the probe surface, and can be applied to complex surfaces. We present in this paper initial results obtained for plasma conditions corresponding to a Debye length equal to the probe radius. These plasma conditions are observed along the Demeter orbit. The model results are found to be in very good agreement with those published by Laframboise (1966) for a spherical probe in a thermal nonflowing plasma. This demonstrates the adequacy of the computation method and of the adjustable numerical parameters (size of the numerical box and mesh, time step, number of macro-particles, etc.) for the considered plasma-probe configuration. We also present the results obtained in the case of plasma flowing with mesothermal conditions reproducing the case of measurements onboard a low altitude spacecraft. Finally, we briefly discuss the capabilities of the SLP to deCorrespondence to: E. Séran (seran@cetp.ipsl.fr) duce the plasma bulk velocity under similar conditions and present the first onboard measurements.

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Observations of the disturbed region around an ionospheric spacecraft

Cited by 47 publications

References 12 publications

Electron and ion temperatures in the ionosphere

Electron and ion temperatures in the ionosphere

Ion acceleration and anomalous transport in the near wake of a plasma limiter

The spherical segmented Langmuir probe in a flowing thermal plasma: numerical model of the current collection

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