Impact of an Extreme Space Weather Event on European Space Assets Carlos Armiens Aparicio European Commission - Joint Research Centre Institute for the.

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Impact of an Extreme Space Weather Event on European Space Assets Carlos Armiens Aparicio European Commission - Joint Research Centre Institute for the Protection and the Security of the Citizen Ispra, Italy 11 th European Space Weather Week Liege, Belgium November 19 th, 2014

Objectives A three step process: Definition of an extreme event. Modelling of impacts: SPENVIS Study of previous events: Halloween What will be the impacts of an extreme solar storm on the EGNOS and Galileo satellites? Risk assessments usually consider events that happen every 100 or 200 years.

A solar storm taking place once in 200 years JPL model for a once in 200 years radiation storm. F30 -> 6 times stronger than Halloween. Probability of exceeding = 0.64 What will be the impacts of an extreme solar storm on the EGNOS and Galileo satellites? Risk assessments usually consider events that happen every 100 or 200 years.

Modelling of radiation sources: Modelling of radiation effects: Trapped ProtonsTrapped ElectronsSolar protons Solar minAP8-MINAE8-MIN UPDATE Solar maxAP8-MAXAE8-MAXJPL 80.0% Extreme Storm JPL 99.2% Worst case electron fluence (internal charging) Ionizing doseShieldose-2 Non-ionizing doseNIEL Damage to solar cellsEQFLUX Single events effectsLong-term SEU rates Internal chargingDICTAT Modelling of inputs and outputs GEO and MEO orbits

Ionizing dose in GEO Below 4 mm of shielding the extreme storm generates less ionizing dose than an average year Only for very thick shielding the extreme storm generates more ionizing dose than an average year Typical satellite shielding Ionizing dose risk level in GEO: LOW

Non-ionizing dose in GEO Non-Ionizing dose risk level in GEO: HIGH Typical satellite shielding Independent of shielding thickness the extreme storm generates about 10 times more non-ionizing dose than an average year

Solar Array degradation in GEO Solar array degradation risk level in GEO: HIGH Independent of coverglass thickness the extreme storm generates about 8 times more solar array degradation than an average year

Study of previous events: Halloween The Halloween storm is one of the most interesting solar storms to study because: It was perfectly characterized by in-orbit particle detectors. There were about 900 satellites operating during those days. The telemetry of those satellites contains precious information about the effects of a very intense solar storm on spacecraft hardware. The collaboration with manufacturers, operators and other entities (ESA, EUMETSAT, …) will be crucial to access those data.