000003370 001__ 3370
000003370 005__ 20180116111136.0
000003370 037__ $$aCTALK-2018-0016
000003370 100__ $$aKatsiyannis, Athanassios
000003370 245__ $$aThe detection of ultra-relativistic electrons in low Earth orbit
000003370 260__ $$c2017
000003370 269__ $$c2017-11-28
000003370 520__ $$aTo better understand the radiation environment in low Earth orbit (LEO), the analysis of in-situ observations of a variety of particles, at different atmospheric heights, and in a wide range of energies, is needed. We present an analysis of energetic particles, indirectly detected by the Large Yield RAdiometer (LYRA) instrument on board ESA's Project for On-board Autonomy 2 (PROBA2) satellite as background signal. Combining Energetic Particle Telescope (EPT) observations with LYRA data for an overlapping period of time, we identified these particles as electrons with an energy range of 2 to 8 MeV. The observed events are strongly correlated to geo-magnetic activity and appear even during modest disturbances. They are also well confined geographically within the L=4-6 McIlwain zone, which makes it possible to identify their source. Although highly energetic particles are commonly perturbing data acquisition of space instruments, we show in this work that ultra-relativistic electrons with energies in the range of 2-8 MeV are detected only at high latitudes, while not present in the South Atlantic Anomaly region.  
000003370 536__ $$a3PRODSIDCEXPLOIT/$$c3PRODSIDCEXPLOIT/$$f3PRODSIDCEXPLOIT
000003370 594__ $$aSTCE
000003370 6531_ $$aionosphere
000003370 6531_ $$aultra-relativistic electrons
000003370 6531_ $$alow Earth orbit
000003370 6531_ $$ageostatic orbit
000003370 6531_ $$aLYRA
000003370 6531_ $$aPROBA2
000003370 6531_ $$aVLF/ELF waves
000003370 6531_ $$aECH
000003370 6531_ $$a    waves -- EMIC waves -- microbursts  -- monoenergetic electrons
000003370 700__ $$aDominique, Marie
000003370 700__ $$aPierrard, Viviane
000003370 700__ $$aLopez Rosson, Graciela
000003370 700__ $$aDe Keyser, Johan
000003370 700__ $$aBerghmans, David
000003370 700__ $$aKruglanski, Michel
000003370 700__ $$aDammasch, Ingolf E.
000003370 700__ $$aDe Donder, Erwin
000003370 773__ $$t14th European Space Weather Week 
000003370 8560_ $$fthanassis.katsiyannis@observatoire.be
000003370 906__ $$aContributed
000003370 980__ $$aCTALKCONT