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Realistic Worst Case for a Severe Space Weather Event Driven by a Fast Solar Wind Stream

Horne, Richard B, Phillips, Mark W, Glauert, Sarah A, Meredith, Nigel P, Hands, Alexander, Ryden, Keith and Liu, Wen (2018) Realistic Worst Case for a Severe Space Weather Event Driven by a Fast Solar Wind Stream Space Weather, 16 (9). pp. 1202-1215.

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Satellite charging is one of the most important risks for satellites on orbit. Satellite charging can lead to an electrostatic discharge resulting in component damage, phantom commands, and loss of service and in exceptional cases total satellite loss. Here we construct a realistic worst case for a fast solar wind stream event lasting 5 days or more and use a physical model to calculate the maximum electron flux greater than 2 MeV for geostationary orbit. We find that the flux tends toward a value of 106 cm−2·s−1·sr−1 after 5 days and remains high for another 5 days. The resulting flux is comparable to a 1 in 150‐year event found from an independent statistical analysis of electron data. Approximately 2.5 mm of Al shielding would be required to reduce the internal charging current to below the National Aeronautics and Space Administration‐recommended guidelines, much more than is currently used. Thus, we would expect many satellites to report electrostatic discharge anomalies during such an event with a strong likelihood of service outage and total satellite loss. We conclude that satellites at geostationary orbit are more likely to be at risk from fast solar wind stream event than a Carrington‐type storm.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
Horne, Richard B
Phillips, Mark W
Glauert, Sarah A
Meredith, Nigel P
Liu, Wen
Date : 10 August 2018
Funders : NERC; FP7
DOI : 10.1029/2018SW001948
Copyright Disclaimer : ©2018. 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.
Uncontrolled Keywords : radiation belts; worst case; fast solar wind; ESD; geostationary orbit
Depositing User : Melanie Hughes
Date Deposited : 20 Sep 2018 08:30
Last Modified : 11 Dec 2018 11:24

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