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WE PROPOSE TO USE MMS OBSERVATIONS IN EARTH S MAGNETOSHEATH IN CO-LINEAR CONFIGURATION TO CARRY OUT A STUDY OF THE STRONG TURBULENCE OBSERVED IN THIS REGION. WE AIM TO FOCUS ON KINETIC SCALE TURBULENCE AND THE DISSIPATIVE PROCESSES OCCURRING AT THOSE SCALES AS WELL AS THE RESULTING PARTICLE HEATING AND ACCELERATION. THESE MULTI-POINT OBSERVATIONS PERFORMED SIMULTANEOUSLY ACROSS MULTIPLE SCALES AND ALONG THE SAME BASELINE PERMIT US TO STUDY THE MULTI-SCALE STATISTICAL PROPERTIES OF THE OBSERVED TURBULENCE. PREVIOUS STUDIES WERE LIMITED TO EITHER SINGLE-SPACECRAFT TECHNIQUES OR A SINGLE SCALE DEFINED BY THE SIZE OF THE TETRAHEDRON OF THE MMS SPACECRAFT FORMATION. ADDITIONALLY THE SPACECRAFT BEING APPROXIMATELY ALIGNED WITH THE ORBITAL PATH AND THE MEAN PLASMA FLOW MEANS THE SPACECRAFT CROSS THE SAME STRUCTURES CONSECUTIVELY IN CLOSE SUCCESSION SEPARATED BY A FEW PROTON GYRATION TIMES. THIS AFFORDS US A UNIQUE OPPORTUNITY TO EXAMINE THE TEMPORAL EVOLUTION OF SUCH KINETIC-SCALE STRUCTURES. THE DATA THAT WILL BE ANALYZED FOR THIS PROJECT CONSISTS OF BURST-RESOLUTION MULTIPOINT MEASUREMENTS OBTAINED BY THE FOUR MMS SPACECRAFT IN THE MAGNETOSHEATH. SPECIFICALLY WE WILL USE DATA FROM THE FLUX-GATE AND SEARCH-COIL MAGNETOMETERS OF THE FIELDS INSTRUMENT SUITE TO IDENTIFY MAGNETIC FIELD STRUCTURES SUCH AS CURRENT SHEETS AND TO CHARACTERIZE THE STATISTICAL PROPERTIES OF THE TURBULENT FLUCTUATIONS. ADDITIONALLY WE WILL USE ELECTRON AND ION VELOCITY DISTRIBUTIONS FROM THE FPI INSTRUMENT TO STUDY THE THERMAL AND SUPRATHERMAL POPULATIONS OBSERVED IN THE TURBULENCE. THE HIGH TIME RESOLUTION AT WHICH 3-DIMENSIONAL DISTRIBUTION FUNCTIONS ARE MEASURED ALLOWS US TO EXAMINE THE EVOLUTION OF THE PLASMA BETWEEN THE FOUR SPACECRAFT AND THUS ENABLES AN INVESTIGATION INTO THE LINK BETWEEN THE FAST-EVOLVING INTERMITTENT STRUCTURES FORMED IN TURBULENCE THE DISSIPATIVE PROCESSES OCCURRING WITHIN THEM AND THE RESULTING PARTICLE ENERGIZATION. THIS ANALYSIS WILL FURTHER OUR UNDERSTANDING OF PLASMA TURBULENCE AT KINETIC SCALES. WE WILL DIRECTLY EVALUATE THE MULTI-SCALE PROPERTIES OF TURBULENCE BEYOND SINGLE SPACECRAFT TECHNIQUES AND THEIR LIMITATIONS. WE WILL ALSO DIRECTLY EXAMINE THE FORMATION AND EVOLUTION OF INTERMITTENT STRUCTURES SUCH AS CURRENT SHEETS WHERE PREVIOUS STUDIES HAVE DEMONSTRATED SIGNIFICANT DISSIPATION OCCURS. THESE RESULTS WILL LEAD TO A DEEPER INSIGHT INTO THE PHYSICS OF TURBULENT DISSIPATION AND THE ASSOCIATED HEATING AND PARTICLE ACCELERATION.

$109,651FY2021National Aeronautics and Space AdministrationNASA

The Regents Of The University Of Colorado

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