Parker Solar Probe observations of helical structures as boundaries for energetic particles

Author:

Pecora F12ORCID,Servidio S2,Greco A2,Matthaeus W H1,McComas D J3,Giacalone J4,Joyce C J3,Getachew T3,Cohen C M S5,Leske R A5,Wiedenbeck M E6,McNutt R L7,Hill M E7,Mitchell D G7,Christian E R8,Roelof E C7,Schwadron N A9,Bale S D10

Affiliation:

1. Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA

2. Dipartimento di Fisica, Università della Calabria, I-87036 Cosenza, Italy

3. Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA

4. Lunar & Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA

5. California Institute of Technology, Pasadena, CA 91125, USA

6. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA

7. Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723, USA

8. NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA

9. Department of Physics & Astronomy, University of New Hampshire, Durham, NH 03824, USA

10. Physics Department, University of California at Berkeley, Berkeley, CA 94720, USA

Abstract

ABSTRACT Energetic particle transport in the interplanetary medium is known to be affected by magnetic structures. It has been demonstrated for solar energetic particles in near-Earth orbit studies, and also for the more energetic cosmic rays. In this paper, we show observational evidence that intensity variations of solar energetic particles can be correlated with the occurrence of helical magnetic flux tubes and their boundaries. The analysis is carried out using data from Parker Solar Probe orbit 5, in the period 2020 May 24 to June 2. We use FIELDS magnetic field data and energetic particle measurements from the Integrated Science Investigation of the Sun (IS⊙IS) suite on the Parker Solar Probe. We identify magnetic flux ropes by employing a real-space evaluation of magnetic helicity, and their potential boundaries using the Partial Variance of Increments method. We find that energetic particles are either confined within or localized outside of helical flux tubes, suggesting that the latter act as transport boundaries for particles, consistent with previously developed viewpoints.

Funder

Princeton University

NASA

Horizon 2020

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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