University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Modelling of electric fields inside spacecraft dielectrics using in-orbit charging current data

Ryden, Keith and Hands, Alexander (2017) Modelling of electric fields inside spacecraft dielectrics using in-orbit charging current data IEEE Transactions on Plasma Science, 45 (5).

[img]
Preview
Text
TPS9586_Ryden_1 0_revised.pdf - Accepted version Manuscript
Available under License : See the attached licence file.

Download (827kB) | Preview
[img]
Preview
PDF (licence)
SRI_deposit_agreement.pdf
Available under License : See the attached licence file.

Download (33kB) | Preview

Abstract

Internal charging caused by energetic electrons is a recognized threat to critical space infrastructure such as navigation and communication satellites. In this paper the electric field developed inside selected on-board dielectrics over a 10-year period in a GPS-like orbit is modelled using actual charging currents measured directly in orbit. The charging currents provide both charge deposition and dose rate inputs to the model, the latter allowing the introduction of radiation induced conductivity (RIC) to improve realism. As expected we find that RIC is a mitigating factor for the electric fields but they can still become very large e.g. a 1.0 mm thickness of PEEK under 0.5mm of Al shielding would be at risk of breakdown almost throughout the mission. We also find that RIC tends to reduce sensitivity to space weather perturbations of the environment such as the April 2010 storm event. This seems physically reasonable but we also know that some satellite anomalies do correlate quite well with space weather and short term (daily) electron fluence increases. We recommend that correlation of anomaly data sets with electric field models of this type is undertaken in future: this will require accurate materials parameters and also needs to take account of sudden depletion of the electric field due to discharges. In addition more charging current sensors with greater shielding levels (>2mm Al equivalent) should be flown to allow modeling of a wider range of realistic cases, including inside well-shielded electronic boxes.

Item Type: Article
Subjects : Electronic Engineering
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
NameEmailORCID
Ryden, Keithk.ryden@surrey.ac.ukUNSPECIFIED
Hands, Alexandera.hands@surrey.ac.ukUNSPECIFIED
Date : 3 March 2017
Identification Number : 10.1109/TPS.2017.2665622
Copyright Disclaimer : 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works
Uncontrolled Keywords : internal charging, electric fields, space weather, medium Earth orbit.
Related URLs :
Additional Information : Special Issue - Spacecraft Charging Technology - 2017
Depositing User : Symplectic Elements
Date Deposited : 07 Feb 2017 18:34
Last Modified : 19 Jul 2017 09:52
URI: http://epubs.surrey.ac.uk/id/eprint/813482

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800