A corrector for spacecraft calculated electron moments
نویسندگان
چکیده
We present the application of a numerical method to correct electron moments calculated on-board spacecraft from the effects of potential broadening and energy range truncation. Assuming a shape for the natural distribution of the ambient plasma and employing the scalar approximation, the on-board moments can be represented as non-linear integral functions of the underlying distribution. We have implemented an algorithm which inverts this system successfully over a wide range of parameters for an assumed underlying drifting Maxwellian distribution. The outputs of the solver are the corrected electron plasma temperature Te, density Ne and velocity vector V e. We also make an estimation of the temperature anisotropy A of the distribution. We present corrected moment data from Cluster’s PEACE experiment for a range of plasma environments and make comparisons with electron and ion data from other Cluster instruments, as well as the equivalent ground-based calculations using full 3-D distribution PEACE telemetry.
منابع مشابه
A gyrokinetic ion zero electron inertia fluid electron model for turbulence simulations
This paper describes the formulation of a hybrid model with fully gyrokinetic ions and a zero-inertia fluid model for the electrons. The electron fluid equations are derived from moments of the drift kinetic equation, taking the small mass ratio limit, but with finite electron temperature. This model eliminates the inertial Alfvén wave and any physics relating to electron transit motion, making...
متن کاملFirst resolved observations of the demagnetized electron-diffusion region of an astrophysical magnetic-reconnection site.
Spatially resolved, diagnostic signatures across the X-line and electron-diffusion region (EDR) by the Polar spacecraft are reported at Earth's magnetopause. The X-line traversal has a local electron's skin depth scale. First, resolved EDR profiles are presented with peak electron thermal Mach numbers >1.5, anisotropy >7, calibrated electron agyrotropy >1, and misordered expansion parameters in...
متن کاملAIAA 98-4574 Numerical Roll Reversal Predictor-Corrector Aerocapture and Precision Landing Guidance Algorithms for the Mars Surveyor Program 2001 Missions
This paper describes guidance algorithms that use numerical predictor-corrector techniques to guide the spacecraft to the proper objectives. The precision landing objective is to deploy a parachute within 10 km of the target, and the aerocapture objective is to use a single atmospheric pass instead of an orbit insertion burn, with the requirement of being within 0.1° of the desired inclination ...
متن کاملرسانش وابسته به اسپین یک نانو ساختار استخوان ماهی نوعی
In this study, we investigated the spin dependent electronic transport of a fishbone-like nanostructure including two magnetic atoms at its ends. The electronic conductance of this nanostructure for three different orientations of atomic magnetic moments was numerically studied when the structure was sandwiched between two nonmagnetic leads. By using Green’s function technique at the tight-bind...
متن کاملSpacecraft potential during an active experiment: a comparison of experimental results with a simple model
The Active Plasma Experiment (APEX) used intensive electron beam and/or a release of the low-energy Xenon plasma to study dynamic processes in the magnetosphere and upper ionosphere. It was shown by Přech et al. (1999) that the release of the Xe plasma increases the spacecraft potential when the ambient plasma density is low, but decreases it when the density is high enough. In the present pape...
متن کامل