Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 852, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/aaa3d7
Keywords
magnetic fields; magnetohydrodynamics (MHD); methods: data analysis; plasmas; solar wind; turbulence
Categories
Funding
- NASA [NNX12AH50G, NNX14AF41G, NNX17AB85G, NRL N00173-14-1-G006, SAO SV4-84017]
- NSF [AGS-1650854]
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We present unique and additional observational evidence for the self-generation of small-scale coherent magnetic flux rope structures in the solar wind. Such structures with durations between 9 and 361 minutes are identified from Wind in situ spacecraft measurements through the Grad-Shafranov (GS) reconstruction approach. The event occurrence counts are on the order of 3500 per year on average and have a clear solar-cycle dependence. We build a database of small-scale magnetic flux ropes from 20 yr worth of Wind spacecraft data. We show a power-law distribution of the wall-to-wall time corresponding well to the inertial range turbulence, which agrees with relevant observations and numerical simulation results. We also provide the axial current density distribution from the GS-based observational analysis, which yields a non-Gaussian probability density function consistent with numerical simulation results.
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