SH022-06
Radial Dependence of the Magnetic Turbulence at Transition and Kinetic Range in the Inner Heliosphere
Wednesday, 9 December 2020: 20:50
Virtual
Die Duan1, Trevor A Bowen2, Jiansen He3, Alfred Mallet4, Stuart D Bale5, John W Bonnell6, Anthony W Case7, Thierry Dudok de Wit8, Keith Goetz9, Justin Christophe Kasper10, Kelly E Korreck7, Peter Harvey11, Davin E Larson12, Robert J. MacDowall13, David Malaspina14, Marc Pulupa15, Michael Louis Stevens7 and Phyllis L Whittlesey15, (1)Peking University, School of Earth and Space Sciences, Beijing, China, (2)University of California Berkeley, Berkeley, CA, United States, (3)Peking University, Beijing, China, (4)University of California Berkeley, Walnut CREEK, CA, United States, (5)University of California Berkeley, Space Sciences Laboratory, Berkeley, CA, United States, (6)University of California, Berkeley, Space Sciences Laboratory, Berkeley, CA, United States, (7)Smithsonian Astrophysical Observatory, Cambridge, MA, United States, (8)LPC2E, CNRS and University of Orléans, Orléans, France, (9)University of Minnesota, School of Physics and Astronomy, Minneapolis, MN, United States, (10)University of Michigan, Climate and Space Sciences and Engineering, Ann Arbor, MI, United States, (11)Space Sciences Laboratory, Berkeley, United States, (12)Space Sciences Laboratory, Berkeley, CA, United States, (13)NASA Goddard SFC, Greenbelt, MD, United States, (14)University of Colorado, Astrophysical and Planetary Sciences Department, Boulder, CO, United States, (15)Space Sciences Laboratory, University of California Berkeley, Berkeley, CA, United States
Abstract:
Magnetohydodynamic range turbulent magnetic fluctuations in the solar wind are typically observed with a Kolmogorov spectral scaling k^(-5/3). At smaller scales, kinetic effects cause the spectrum to steepen. We present a statistical study of the kinetic-scale turbulence using measurements from the PSP/FIELDS fluxgate and search coil magnetometers in the inner heliosphere (0.16 -0.30 AU). At kinetic scales a spectrum of -8/3 is measured; however, we show that a transition range between magnetohydrodynamic and kinetic scales is commonly observed. Analysis of the radial scaling shows that the both transition and kinetic range spectrum becomes steeper and more pronounced closer to the sun.
