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- SH11B-01: Observations of >MeV particles observed at a weak interplanetary shock by Parker Solar Probe (invited)
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Lynn Wilson, NASA Goddard Space Flight Center (First Author, Presenting Author)
J. Grant Mitchell, NASA Goddard Space Flight Center
Adam Szabo, NASA Goddard Space Flight Center
Immanuel Christopher Jeba Raj, University of Turku
Michael Stevens, Smithsonian Astrophysical Observatory
David Malaspina, Laboratory for Atmospheric and Space Physics
Grant Berland, Johns Hopkins University Applied Physics Laboratory
Athanasios Kouloumvakos, The Johns Hopkins University. Applied Physics Laboratory
Stuart Bale, University of California, Berkeley
Roberto Livi, University of California Berkeley
Jasper Halekas, University of Iowa
Christina Cohen, Caltech
We observe a weak interplanetary shock generating particles with energies 10,000 times higher than it should be capable of doing. The shock is not special, in that it is a weak, quasi-perpendicular shock. There is, however, an usually large amplitude electromagnetic fluctuation upstream, called a whistler precursor. That is, the precursor's amplitude is >200 times what is necessary to drive the terrestrial aurora, but the surface area over which the wave occurs at the shock is orders of magnitude larger. The particles are clearly coming from the shock, not a remote location like the Sun. Thus, if the wave is indeed the cause of the unusually energetic particles, then it raises questions about what more extreme environments could produce (e.g., astrophysical shocks like those near pulsars or supernovas).
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