[IGPP Everyone] EPSS Space Physics seminar announcement - Friday October 29, 2021 - 03:30 PM Pacific Time (US and Canada)

[Sowmendran, Margie (IGPP)]

SPACE PHYSICS SEMINAR

DEPARTMENT OF EARTH, PLANETARY, AND SPACE SCIENCES
DEPARTMENT OF ATMOSPHERIC AND OCEANIC SCIENCES
UNIVERSITY OF CALIFORNIA, LOS ANGELES

ZOOM LINK PROVIDED BELOW

 https://ucla.zoom.us/j/92101918782?pwd=Z2o5RmI4OEpBWW4zcG1DZStIUWgrZz09


Nature and Role of Turbulence in the Inner Heliosphere: Parker Solar Probe Results

Chris Chen
Queen Mary University of London

Parker Solar Probe, launched in 2018, has become the first spacecraft to measure the solar wind in situ closer than 0.28 AU to the Sun, and has currently reached distances down to 15 solar radii from the solar surface. These measurements have revealed much about the young solar wind, the physical processes occurring within it, and how they evolve into the well-known features seen at 1 AU. One particular aspect of interest is the solar wind turbulence, which PSP has shown to continually intensify with the decreasing solar distances measured so far. In this talk, I will present what we have learned so far about turbulence in the young solar wind. Some of these findings have confirmed our expectations from current models, but some have been unexpected, forcing us to think of new explanations for the fundamental behaviour of turbulence in this regime. Furthermore, turbulence is thought to play a key role in some of the questions at the heart of the PSP mission - the heating of the solar corona, the acceleration of the solar wind, and the large-scale structure of the heliosphere. PSP's early orbits allowed us to test turbulence-driven models for the origin of the solar wind at far closer distances than previously possible, generally finding a good match for the required energy fluxes and other properties. With the more recent orbits encountering different classes of solar wind, we have now also began to be able to test the generality of such findings, and there are indications that other driving mechanisms in addition to the turbulence may be required in some wind types. Overall, there have been many interesting new findings, but also new questions raised, which further work and data from closer to the Sun in the coming years of the mission should help us resolve.


Friday, October 29 2021
3:30 - 5:00 PM

In-Charge:  Marco Velli

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