Journal
PHYSICS OF PLASMAS
Volume 29, Issue 7, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0097983
Keywords
-
Categories
Funding
- University of Otago
- Rutherford Discovery Fellowship [RDF-U001804]
- Marsden fund [MFP_U0020]
- New Zealand eScience Infrastructure (NeSI) [uoo02637]
Ask authors/readers for more resources
This study examines the properties of magnetic field switchbacks in the solar wind using three-dimensional expanding box simulations. The inclusion of the Parker spiral is shown to cause asymmetric deflections of the magnetic field within switchbacks, along with other distinct properties. The agreement of these properties with observations provides further support for the Alfven wave model of switchbacks.
Switchbacks-abrupt reversals of the magnetic field within the solar wind-have been ubiquitously observed by Parker Solar Probe (PSP). Their origin, whether from processes near the solar surface or within the solar wind itself, remains under debate and likely has key implications for solar wind heating and acceleration. Here, using three-dimensional expanding box simulations, we examine the properties of switchbacks arising from the evolution of outwards-propagating Alfven waves in the expanding solar wind in detail. Our goal is to provide testable predictions that can be used to differentiate between properties arising from solar surface processes and those from the in situ evolution of Alfven waves in switchback observations by PSP. We show how the inclusion of the Parker spiral causes magnetic field deflections within switchbacks to become asymmetric, preferentially deflecting in the plane of the Parker spiral and rotating in one direction toward the radial component of the mean field. The direction of the peak of the magnetic field distribution is also shown to be different from the mean field direction due to its highly skewed nature. Compressible properties of switchbacks are also explored, with magnetic-field-strength and density fluctuations being either correlated or anticorrelated depending on the value of beta, agreeing with predictions from theory. We also measure dropouts in magnetic-field strength and density spikes at the boundaries of these synthetic switchbacks, both of which have been observed by PSP. The agreement of these properties with observations provides further support for the Alfven wave model of switchbacks. Published under an exclusive license by AIP Publishing.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available