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UID:a06c91342fb0f151ef322718fe537289
DTSTAMP:20261028T071830Z
SUMMARY:SPC Seminar – Space – Domenico Trotta (ESA)
DESCRIPTION:Title: Particle acceleration in the Heliosphere\, from its most
  extreme shocks to its quietest times\nSpeaker: Domenico Trotta\nAbstract:
  Energetic particles pervade the heliosphere\, from violent solar eruption
 s to the quietest solar wind\, making it a unique in situ laboratory for p
 rocesses that operate in distant astrophysical accelerators. Yet a fundame
 ntal question remains open: how does particle acceleration start in the fi
 rst place? With this injection problem as a common thread\, I will show ex
 amples that address it by leveraging new missions such as Solar Orbiter\, 
 from the most extreme acceleration events to the quietest background.\nI w
 ill first present Solar Orbiter observations of more than 170 interplaneta
 ry shocks\, stressing key aspects of how shocks energise protons\, from th
 eir overall acceleration efficiency to extreme events that approach regime
 s typical of astrophysical accelerators. I will also present a strong\, qu
 asi-perpendicular shock that accelerated electrons up to 15 MeV\, the high
 est energies ever measured for locally accelerated electrons at a heliosph
 eric shock. Starting from this event and combining observations from sever
 al missions\, I will then show why a complete picture requires bringing to
 gether local acceleration processes and global\, mesoscale effects.\nI wil
 l then turn to quiet times\, when the solar wind still carries a persisten
 t population of suprathermal “superhalo” electrons whose origin remain
 s unresolved\, and discuss how it connects to the processes seen during ac
 tive periods. Finally\, I will outline my research plan at Imperial as a R
 oyal Society University Research Fellow from January 2027: tackling the in
 jection problem by combining a unique set of heliospheric missions with nu
 merical simulations\, with the goal of turning injection from a free param
 eter of acceleration models into a predictable quantity.
URL:https://www.imperial.ac.uk/events/215847/spc-seminar-space-domenico-tro
 tta-esa/
DTSTART;TZID=Europe/London:20261109T140000
DTEND;TZID=Europe/London:20261109T150000
LOCATION:741\, Blackett Building\, South Kensington Campus\, Imperial Colle
 ge London\, London\, SW7 2AZ\, United Kingdom
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