First multipoint in situ observations of electron microbursts: Initial results from the NSF FIREBIRD II mission
| Autor: | Harlan E. Spence, A. B. Crew, Ehson Mosleh, Nicholas Ryhajlo, Matthew Handley, Keith Mashburn, J. Bernard Blake, T. Paul O'Brien, M. Widholm, L. Springer, Stephen Longworth, Brian A. Larsen, S. Smith, Shane Driscoll, David Klumpar, Jason S. Legere |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences Meteorology Equator Electron precipitation Electron Astrophysics 01 natural sciences symbols.namesake Geophysics 13. Climate action Space and Planetary Science Coincident Van Allen radiation belt Microburst 0103 physical sciences symbols Orbit (dynamics) Spatial ecology 010303 astronomy & astrophysics Physics::Atmospheric and Oceanic Physics 0105 earth and related environmental sciences |
| Zdroj: | Journal of Geophysical Research: Space Physics. 121:5272-5283 |
| ISSN: | 2169-9402 2169-9380 |
| Popis: | We present initial dual spacecraft observations that for the first time both constrain the spatial scale size and provide spectral properties at medium energies of electron microbursts. We explore individual microburst events that occurred on 2 February 2015 using simultaneous observations made by the twin CubeSats which comprise the National Science Foundation (NSF) Focused Investigations of Relativistic Electron Bursts: Intensity, Range, and Dynamics (FIREBIRD II). During these microburst events, the two identically instrumented FIREBIRD II CubeSats were separated by as little as 11 km while traversing electron precipitation regions in low-Earth orbit. These coincident microburst events map to size scales >120 km at the equator. Given the prevalence of coincident and noncoincident events we conclude that this is of the same order of magnitude as that of the spatial scale size of electron microburst, an unknown property that is critical for quantifying their overall role in radiation belt dynamics. Finally, we present measurements of electron microbursts showing that precipitation often occurs simultaneously across a broad energy range spanning 200 keV to 1 MeV, a new form of empirical evidence that provides additional insights into the physics of microburst generation mechanisms. |
| Databáze: | OpenAIRE |
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