2011
DOI: 10.1063/1.3640512
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A laboratory experiment to examine the effect of auroral beams on spacecraft charging in the ionosphere

Abstract: A 2.54 cm diameter conducting electrically isolated Copper sphere is suspended in a low density (10 4 cm À3 ), low temperature (T e ¼ 0.5 eV) Argon plasma, which mimics a spacecraft in an ionospheric plasma. An electron beam with current density of approximately 10 À10 A=cm 2 and beam spot of 10.2 cm diameter, which mimics an auroral electron beam, is fired at the sphere while varying the beam energy from 100 eV to 2 keV. The plasma potential in the sheath around the sphere is measured using an emissive probe … Show more

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Cited by 11 publications
(14 citation statements)
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“…The plasma density is n ; k B is the Boltzmann constant; m i is the ion mass; e is the fundamental electric charge; T ∥ , T1, T2, u ∥ , u1, and u2 are the temperatures and drift velocities, respectively, measured with respect to the magnetic field direction. The spacecraft potential Φ sc is given by Siddiqui et al [] as Φsc=knormalBTnormaleeln()mnormaliTnormalemnormaleTnormaliVss where m e is the electron mass, T i is the (isotropic) ion temperature, T e is the electron temperature (from ERPA, Figure e), and V ss is the spacecraft sphere‐to‐skin voltage difference measured by the COWBOY. The first term represents the idealized float potential of a perfectly conducting sphere; the second term is the measured difference between such a sphere (the electric field probes) and the irregular nonideal spacecraft (this term is reported positive and thus serves to further decrease the spacecraft potential).…”
Section: Discussionmentioning
confidence: 99%
“…The plasma density is n ; k B is the Boltzmann constant; m i is the ion mass; e is the fundamental electric charge; T ∥ , T1, T2, u ∥ , u1, and u2 are the temperatures and drift velocities, respectively, measured with respect to the magnetic field direction. The spacecraft potential Φ sc is given by Siddiqui et al [] as Φsc=knormalBTnormaleeln()mnormaliTnormalemnormaleTnormaliVss where m e is the electron mass, T i is the (isotropic) ion temperature, T e is the electron temperature (from ERPA, Figure e), and V ss is the spacecraft sphere‐to‐skin voltage difference measured by the COWBOY. The first term represents the idealized float potential of a perfectly conducting sphere; the second term is the measured difference between such a sphere (the electric field probes) and the irregular nonideal spacecraft (this term is reported positive and thus serves to further decrease the spacecraft potential).…”
Section: Discussionmentioning
confidence: 99%
“…Comparison of T, T e , and a for 3D numerical simulations From the data given in Table I, the temperature, electron temperature, and ionization degree related to HVIGPs were numerically calculated by Eqs. (19) and (20) and listed in Table II.…”
Section: Analysis and Discussionmentioning
confidence: 99%
“…23 e 1 will be discussed later. Equation (20) is the fitting form of the TF model given by Bell. 23 In calculation, the cgs units (length in cm, weight in g, and time in s) are adopted except for the energy and temperature which are in eV.…”
Section: Determination Of the Temperaturementioning
confidence: 99%
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