Speaker
Description
JEDI (Joint EUV Coronal Diagnostic Investigation) is an instrument selected by NASA under the Heliophysics Living With a Star program to fly on the European Space Agency’s Vigil Mission. From Vigil’s orbit around L5 JEDI will take high cadence, multi-thermal, Extreme ultraviolet images of the solar disk through the middle corona, providing crucial coverage and insight into Earth-directed space weather events. JEDI will advance the understanding and predictability of the ground state of space weather and the extreme space weather events. The middle corona, which JEDI captures in an unprecedented combination of spatial resolution, temporal resolution, and temperature coverage, is a crucial region that connects space weather events to their solar source. JEDI will capture events ranging from the extreme coronal mass ejections (CMEs), flares, and proto-stream interaction regions (SIRs), through the ground state of space weather, i.e. solar wind and its structures. The ground state of space weather is the solar wind itself and the embedded mesoscale structures that are created as a direct result of how the solar wind is formed. CME and SIR propagation are impacted by solar wind structure: CMEs and SIRs plow through and sweep up existing solar wind structures. Importantly, structures that are ‘mesoscale’ within the solar wind are large compared to geospace, driving dynamics even during so-called ‘quiet’ times, and thus are crucial for understanding all space weather events. Mesoscale structures drive geospace dynamics both within larger storms and during ‘quieter’ times, including ultralow frequency waves, substorms, geomagnetically induced currents, and relativistic radiation belt particle dynamics. For example, the mesoscales upstream of SIRs and CMEs can be as or more important than the discontinuity itself to the overall geospace impact from the event. In this presentation, we describe these aspects of the science of JEDI, as well as the joint science achieved in coordination with the other Vigil instruments and L1 assets.
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