NASA Technical Reports Server (NTRS) 20030105579: Single Event Effects: Space and Atmospheric Environments PDF
Preview NASA Technical Reports Server (NTRS) 20030105579: Single Event Effects: Space and Atmospheric Environments
Single Event Effects: Space and Atmospheric Environments Janet L. Barth NASNGSFC Flight Data Systems & Radiation Effects Single Event Upsets in Future Computing Systems Jet Propulsion Laboratory May 20,2003 J. BartW561- 5/03 Outline + Sun-Earth Connections + Heavy Ions Galactic Cosmic Rays )) Solar Particle Events )) + Protons Solar Particle Events )) Trapped )) + Atmospheric Neutrons + Summary 2 J. BartW561- 5/03 The Radiation Environment Nikkei Science, Inc. of Japan, by K. Endo 3 J. BarlW561- 5/03 The 7 7-Year Solar Activity Cycle Sunspot cycle discovered in 1645 to 1715 0 I I - Length varies from 9 13 years 7 Years Solar Maximum, 4 Years Solar Minimum 4 J. BarlW561- 5/03 2 Solar Flare & Particles SOH0 InstrumentslElT & LASCO Solar flares are observed as sudden brightening near sunspots. The solar system's largest explosive events. Particles are accelerated directly by event. 5 J. 13artW561- 5/03 Coronal Mass Ejections Bubble of gas & magnetic field . Ejects billions of tons of matter. Shock wave accelerates particles to millions of kmlhr throughout the Solar System. 6 J. Ba1W561- 5'03 3 - CME Movies SOHO/LASCO 7 .I Barth/561- .VO3 - Heavy Ions Galactic Cosmic Ray & Solar J. BadhI561- 5/03 4 I ~ ~~ - Ga/actic Cosmic Ray lons Re/at ive A bundance Nuclear Charge (Z) 9 J. BartW561- 5/03 Heavy /on Measurements - CNO 24 Hour Averaged Mean Exposure Flux Date 10 5 ~ Heavy Ion LET Spectra ansient Particles Unattenuated by the Magnetosphere LET (MeV-cm2/mg) 11 GCR Heavy Ions as a Function of Orbit CREME 96. Solar Minimum, 100 mils (2.54 mm) AI LET (MeV-cm2/mg) 12 J. Barih/561- 5/03 6 - Protons Solar & Trapped J. BarlW561- 5/03 Solar Proton Events Proton Event Fluences Year 14 J. BariW561- 5/03 7 - TIROS Proton Detector / 15 J. BartM561- 5/03 - TIROS Proton Detector .... 16 I J. BartM561- 5/03 8 r - TIROS Proton Detector 17 J. BartW561- 5/03 - TIROS Proton Detector 1a 9 Trapped Particle Motions Spiral, Bounce, Drift FluxTube - - - .. . \, __*- k"' ', =' Trapped Particle Trajectory' Proton Mirror Point 1 I Electron Drift Magnetic Field Lind I I - / -.- -.- - - - / / Conjugate Mirror Point .I I I afferHess 19 Van Allen Belts High Latitude Horns / E1mSB Outer Belt 20 J. BarW561- U03 10
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