Skip to Main content Skip to Navigation
Journal articles

Clustering of Intermittent Magnetic and Flow Structures near Parker Solar Probe ’s First Perihelion—A Partial-variance-of-increments Analysis

Rohit Chhiber 1, 2 M Goldstein B. Maruca 1 A. Chasapis 1 W. Matthaeus 1 D. Ruffolo R. Bandyopadhyay 1 T. Parashar 1 R. Qudsi 1 Thierry Dudok de Wit 3 S. Bale 4 J. Bonnell 4 K. Goetz P. Harvey 4 R. Macdowall D. Malaspina M. Pulupa 4 J. Kasper K. Korreck A. Case M. Stevens P. Whittlesey 4 D. Larson 4 R. Livi 4 M. Velli N. Raouafi
1 DSU - Delaware State University
2 GSFC - NASA Goddard Space Flight Center
3 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
4 University of California [Berkeley]
Abstract : During the Parker Solar Probe's (PSP) first perihelion pass, the spacecraft reached within a heliocentric distance of similar to 37 R-circle dot and observed numerous magnetic and flow structures characterized by sharp gradients. To better understand these intermittent structures in the young solar wind, an important property to examine is their degree of correlation in time and space. To this end, we use the well-tested partial variance of increments (PVI) technique to identify intermittent events in FIELDS and SWEAP observations of magnetic and proton-velocity fields (respectively) during PSP's first solar encounter, when the spacecraft was within 0.25 au from the Sun. We then examine distributions of waiting times (WT) between events with varying separation and PVI thresholds. We find power-law distributions for WT shorter than a characteristic scale comparable to the correlation time of the fluctuations, suggesting a high degree of correlation that may originate in a clustering process. WT longer than this characteristic time are better described by an exponential, suggesting a random memory-less Poisson process at play. These findings are consistent with near-Earth observations of solar wind turbulence. The present study complements the one by Dudok de Wit et al., which focuses on WT between observed "switchbacks" in the radial magnetic field.
Document type :
Journal articles
Complete list of metadatas

Cited literature [84 references]  Display  Hide  Download
https://hal-insu.archives-ouvertes.fr/insu-02937822
Contributor : Nathalie Pothier <>
Submitted on : Thursday, September 17, 2020 - 11:51:04 AM
Last modification on : Saturday, September 19, 2020 - 4:56:25 AM

File

Vignette du document
1912.03608.pdf
Files produced by the author(s)

Identifiers

Collections

INSU | OBSPM | CNRS | UNIV-ORLEANS | OSUC | LPC2E

Citation

Rohit Chhiber, M Goldstein, B. Maruca, A. Chasapis, W. Matthaeus, et al.. Clustering of Intermittent Magnetic and Flow Structures near Parker Solar Probe ’s First Perihelion—A Partial-variance-of-increments Analysis. Astrophysical Journal Supplement, American Astronomical Society, 2020, Early Results from Parker Solar Probe: Ushering a New Frontier in Space Exploration, 246 (2), pp.31. ⟨10.3847/1538-4365/ab53d2⟩. ⟨insu-02937822⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

26

Files downloads

6