Charging effect simulation method at tail region of spacecraft

Abstract

The invention provides a charging effect simulation method at a tail region of a spacecraft. The method comprises the following steps: establishing a fitting expression of a polar region precipitated electron spectrum, which is the relation for the variation of aurora electron flux phi with energy E, wherein the relation is expressed through superposition of power law distribution phip (E), maxwellian distribution phim (E) and Gaussian distribution phiG (E), and fitting the polar region precipitated electron spectrum; establishing an ion distribution characteristic spectrum in a background plasma environment; testing secondary electron emission spectrums of different surface materials of the spacecraft; performing process simulation of the charging effect at the tail region of the spacecraft by using a Particle-In-Cell (PIC) method based on the three-category spectrum. The method has the advantages that the simulation process is clear, the simulation result conforms to the actual monitored charging situation and the like.

Description

technical field [0001] The invention belongs to the field of space computing, and is applicable to the simulation of the charging process of the surface dielectric material in the tail area of ​​a polar orbit (Polar Earth Orbit) spacecraft, and in particular relates to the electrification of the tail area of ​​a spacecraft under the action of background plasma and auroral electrons in the polar area effect simulation method. Background technique [0002] Low-Earth orbit (commonly known as polar orbit) spacecraft with an inclination greater than or equal to 55 degrees will frequently cross the auroral arc. Spacecraft encounter an energetic electronic environment similar to that in geostationary orbit. The polar orbital plasma environment mainly increases the possibility of encountering auroral particle events due to passing through the polar regions. Auroral particle events refer to the aurora caused by high-energy charged particles (electrons and protons) that occur during ...

AI Technical Summary

Problems solved by technology

[0004] At present, there are some simulation methods of electrification effect in the tail area of ​​polar orbiting spacecraft in use in the world, such as the simulation method of electrification effect in the tail area of ​​large spacecraft in the polar region of NASA and the plasma interaction simulation method of ESA in the tail area of ​​polar orbiting spacecraft. , these simulation methods are similar in principle, but there are some differences in use and function, but the core codes of these simulation methods are not disclosed and the simulation accuracy cannot be evaluated

There are few domestic studies in this area, and when simulating the polar region auroral electron deposition spectrum, a more realistic polar region electron distribution spectrum is not used.

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