期刊
ASTROPHYSICAL JOURNAL
卷 898, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-4357/ab9b7e
关键词
Solar wind; Interplanetary turbulence; Spectral index
资金
- NSF EPSCoR RII-Track-1 Cooperative Agreement [OIA-1655280]
- NSF/DOE Partnership in Basic Plasma Science and Engineering via NSF [PHY-1707247]
- NASA Parker Solar Probe contract [SV4-84017]
- Italian Space Agency (ASI) [I/013/12/0]
- ERA-PLANET program within the IGOSP project [689443]
Parker Solar Probe (PSP) observed a large variety of Alfvenic fluctuations in the fast and slow solar wind flow during its two perihelia. The properties of Alfvenic solar wind turbulence have been studied for decades in the near-Earth environment. A spectral index of -5/3 or -2 for magnetic field fluctuations has been observed using spacecraft measurements, which can be explained by turbulence theories of nearly incompressible magnetohydrodynamics (NI MHD) or critical balance. In this study, a rigorous search of field-aligned solar wind is applied to PSP measurements for the first time, which yields two events in the apparently slow solar wind. The parallel spectra of the magnetic fluctuations in the inertial range show a k(parallel to)(-5/3) power law. Probability distributions of the magnetic field show that these events are not contaminated by intermittent structures, which, according to previous studies, are known to modify spectral properties. The results presented here are consistent with spectral predictions from NI MHD theory and further deepen our understanding of the Alfvenic solar wind turbulence near the Sun.
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