Some implications of satellite spin effects in cylindrical probe measurements

Miller, Nathan J.

doi:10.1029/ja077i016p02851

Cited by 20 publications

(8 citation statements)

References 18 publications

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“…Experiments on board an elliptical-orbit satellite 16 and a rocket, 17 covering a broad range of altitudes, did show a current dependent on the angle between B and a cylindrical probe ͑B-effects͒ when N ϱ dropped low enough, at very low and high altitudes. In all such experiments, probe bias was only moderately high, however.…”

Section: Equation ͑32͒mentioning

confidence: 99%

The orbital-motion-limited regime of cylindrical Langmuir probes

Sanmartin¹,

Estes²

1999

Physics of Plasmas

115

164

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An asymptotic analysis of electron collection at high bias ⌽ p serves to determine the domain of validity of the orbital-motion-limited ͑OML͒ regime of cylindrical Langmuir probes, which is basic for the workings of conductive bare tethers. The radius of a wire collecting OML current in an unmagnetized plasma at rest cannot exceed a value, R max , which is found to exhibit a minimum as a function of ⌽ p ; at ⌽ p values of interest, R max is already increasing and is larger than the electron Debye length De . The breakdown of the regime relates to conditions far from the probe, at electron energies comparable to the ion thermal energy, kT i ; R max is found to increase with T i . It is also found that ͑1͒ the maximum width of a thin tape, if used instead of a wire, is 4R max ; ͑2͒ the electron thermal gyroradius must be larger than both R and De for magnetic effects to be negligible; and ͑3͒ conditions applying to the tether case are such that trapped-orbit effects are negligible.

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Section: Equation ͑32͒mentioning

confidence: 99%

The orbital-motion-limited regime of cylindrical Langmuir probes

Sanmartin¹,

Estes²

1999

Physics of Plasmas

115

164

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“…Another perturbation comes from the magnetic field effect on the trajectories of the particles. This has been experimentally detected [Miller, 1972] and theoretically analyzed in some particular cases [Whipple, 1965;Lafon, 1973].…”

Section: Introductionmentioning

confidence: 99%

Rocket spin effects on the current collected by a cylindrical probe in the ionosphere

Meyer‐Vernet¹

1976

J. Geophys. Res.

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The dc current collected by a rocket‐borne cylindrical probe with various bias potentials has been measured, along with the plasma parameters (by in situ independent measurements on the same payload). Periodic variations synchronous with the rocket spin cycle appear; they are related to wake effects for the ion current and to both wake and V × B effects for the electron current. The ion current modulations are quantitatively explained by a theory on the wake which takes account of the angle between the velocity and the rocket axis; the electron current modulations due to the V × B field are separated from the others and quantitatively explained by simple calculations. As a by‐product the ion current outside the wake gives an unperturbed density measurement in agreement to within 15% with an independent measurement.

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“…They found that magnetic effects are important, even when the wire radius is small compared to the electron gyroradius, if the latter is less than the thickness of the plasma sheath. This conclusion is based on the calculations by Laframboise and Rubinstein [1976], Betringer and Wa!ker [1965], Miller [1972], and experimental results collected by a pulsed plasma probe flown on a scientific rocket payload (NASA 18.170).…”

mentioning

confidence: 99%

Current‐produced magnetic field effects on current collection

Khazanov¹,

Stone²,

Krivorutsky³

et al. 2000

J. Geophys. Res.

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Abstract. Current collection by an infinitely long, conducting cylinder in a magnetized plasma, taking into account the magnetic field of the collected current, is discussed. A region of closed magnetic surfaces disconnects the cylinder from infinity. Owing to this, the collected current depends on the ratio between this region and the plasma sheath region and, under some conditions, current reduction arises. It is found that the upper bound limit of current collection is reduced due to this change of magnetic field topology. The effect can be substantial even if the orbit-limited model of current collection is valid. This model is used to find the reduction of the total current collected by a cylinder (e.g., a bare tether). It is shown that this effect strongly depends on plasma density. The results are applied to a tether system in the ionosphere, and it is found that current reduction can be significant for long tethers in typical dayside ionospheric conditions.

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Some implications of satellite spin effects in cylindrical probe measurements

Cited by 20 publications

References 18 publications

The orbital-motion-limited regime of cylindrical Langmuir probes

The orbital-motion-limited regime of cylindrical Langmuir probes

Rocket spin effects on the current collected by a cylindrical probe in the ionosphere

Current‐produced magnetic field effects on current collection

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