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Extreme internal charging currents in medium Earth orbit: Analysis of SURF plate currents on Giove-A

Meredith, NP, Horne, RB, Isles, JD, Ryden, KA, Hands, ADP and Heynderickx, D (2016) Extreme internal charging currents in medium Earth orbit: Analysis of SURF plate currents on Giove-A Space Weather.

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Abstract

Relativistic electrons can penetrate spacecraft shielding and can damage satellite components. Spacecraft in medium Earth orbit pass through the heart of the outer radiation belt and may be exposed to large fluxes of relativistic electrons, particularly during extreme space weather events. In this study we perform an extreme value analysis of the daily average internal charging currents at three different shielding depths in medium Earth orbit as a function of L∗ and along the orbit path. We use data from the SURF instrument on board the European Space Agency's Giove-A spacecraft from December 2005 to January 2016. The top, middle, and bottom plates of this instrument respond to electrons with energies >500 keV, >700 keV, and >1.1 MeV, respectively. The 1 in 10 year daily average top plate current decreases with increasing L∗ ranging from 1.0 pA cm−2 at L∗=4.75 to 0.03 pA cm−2 at L∗=7.0. The 1 in 100 year daily average top plate current is a factor of 1.2 to 1.8 larger than the corresponding 1 in 10 year current. The 1 in 10 year daily average middle and bottom plate currents also decrease with increasing L∗ ranging from 0.4 pA cm−2 at L∗=4.75 to 0.01 pA cm−2 at L∗=7.0. The 1 in 100 year daily average middle and bottom plate currents are a factor of 1.2 to 2.7 larger than the corresponding 1 in 10 year currents. Averaged along the orbit path the 1 in 10 year daily average top, middle, and bottom plate currents are 0.22, 0.094, and 0.094 pA cm−2, respectively.

Item Type: Article
Subjects : Electronic Engineering
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering > Surrey Space Centre
Authors :
AuthorsEmailORCID
Meredith, NPUNSPECIFIEDUNSPECIFIED
Horne, RBUNSPECIFIEDUNSPECIFIED
Isles, JDUNSPECIFIEDUNSPECIFIED
Ryden, KAUNSPECIFIEDUNSPECIFIED
Hands, ADPUNSPECIFIEDUNSPECIFIED
Heynderickx, DUNSPECIFIEDUNSPECIFIED
Date : 16 August 2016
Identification Number : 10.1002/2016SW001404
Copyright Disclaimer : ©2016. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited
Depositing User : Symplectic Elements
Date Deposited : 05 Sep 2016 11:58
Last Modified : 05 Sep 2016 11:58
URI: http://epubs.surrey.ac.uk/id/eprint/811976

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