Analysis Of ISS SpaceCube Experiment Mini (ISEM) Upsets
Analysis of ISS SpaceCubeExperiment Mini (ISEM) UpsetsSujay Kazi(MIT Class of 2021)
What Is ISEM?The ISS SpaceCube ExperimentMini (ISEM) is designed to increasecomputing power on board theInternational Space Station.Image Credits: Nasa.govSpaceCube occasionally experiencesupsets known as single-event upsets(SEUs), which are caused by a singleparticle hitting sensitive electronicsand freeing an embedded particle.Image Credits: Nasa.gov
What Are The Suspects?Image Credits:Yihua Zheng
2017 Upset MapImage Credits: Thomas Flatley
Map of SAAImage Credits: Keyan Gootkin
Upsets Likely Caused by SAATo estimate the proportion of upsets caused by the SAA,we made the following simplifying assumptions:1. ISS uniformly distributed over area that its orbit covers(all parts of the Earth with latitude between -51.6degrees and 51.6 degrees)2. Upsets are caused by SAA at uniform rate over entireregion of SAA and caused by background effects atuniform rate over entire region of ISS orbit
Upsets Likely Caused by SAADefine the following:Then the following can be derived usingsome simple algebra:
Upsets Likely Caused by SAA
Data Analysis We then analyzed the times of the ISEM upsetdata from 2014 and 2017. If a given space weather event is a notablecause of the upsets, then the fraction ofupsets that fall in the vicinity of a given eventshould exceed by a significant amount thefraction of the year that falls in the vicinity ofa given event.
Data Analysis (continued)The table below shows the space weatheranalysis of the 2014 upset data.
Testing the GCR Hypothesis:Poisson DistributionImage Credits: Brilliant.org
Poisson Distribution (continued)
Conclusions SAA and GCRs are likely causes of a significantfraction of upsets Space weather events such as geomagneticstorms, SEP events, and RBEs appear to be ofless significance Conclusions highly limited by small amount ofdata and weak solar activity
Ideas for Further Research More data from many more years Track variation of rate of upsets over solar cycle(to test GCR hypothesis) Analyze stronger solar maximum (would requirewaiting almost a decade) to see possibility ofspace weather effects Look more into design of SpaceCube forprevention possibilities Assess levels of space weather threats at otherlocations of interest (e.g. Lagrange points)
AcknowledgmentsI would like to thank: Yihua Zheng (guidance) CCMC staff (space weather education) Thomas Flatley (ISEM data) Keyan Gootkin (Pythonista) forecasting interns (daily entertainment)
References Galactic Cosmic Rays. (2012, May 11). Retrieved July 16, 2018, fromhttps://helios.gsfc.nasa.gov/gcr.htmlGinet, G.P., et al. (2013). AE9, AP9 and SPM: New Models for Specifying the TrappedEnergetic Particle and Space Plasma Environment. In: Fox, N., Burch, J.L. (Eds.), The Van AllenProbes Mission. Springer, Boston, MA.I.S.S. Tracker. (n.d.). Retrieved July 18, 2018, from http://www.isstracker.com/historicalMewaldt, R. A., Davis, A. J., Lave, K. A., et al. 2010, ApJL, 723, L1Poisson Distribution. (n.d.). Retrieved August 01, 2018, n/Primary Cosmic Rays. (n.d.). Retrieved July 16, 2018, fromhttp://cosmic.lbl.gov/SKliewer/Cosmic Rays/Primary.htmSpaceCube: A Family of Reconfigurable Hybrid On-Board Science Data Processors. (2017,April 4). Retrieved July 2, 2018, from https://spacecube.nasa.gov/Zheng, Y. (2018). Space Weather Impacts on Satellites/Space Assets [PowerPoint slides].Retrieved fromhttps://ccmc.gsfc.nasa.gov/RoR WWW/SWREDI/2018/REDI2018 template SWx Impacts Sat final f.pdf
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Sujay Kazi (MIT Class of 2021) What Is ISEM? SpaceCube occasionally experiences upsets known as single-event upsets (SEUs), which are caused by a single particle hitting sensitive electronics and freeing an embedded particle. The ISS
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