Evidence of Subproton Scale Magnetic Holes in the Venusian Magnetosheath

Author
Keywords
Abstract
Depressions in magnetic field strength, commonly referred to as magnetic holes, are observed ubiquitously in space plasmas. Subproton scale magnetic holes with spatial scales smaller than or on the order of a proton gyroradius, are likely supported by electron current vortices, rotating perpendicular to the ambient magnetic field. While there are numerous accounts of subproton scale magnetic holes within the Earth s magnetosphere, there are few, if any, reported observations in other space plasma environments. We present the first evidence of subproton scale magnetic holes in the Venusian magnetosheath. During Parker Solar Probe s first Venus Gravity Assist, the spacecraft crossed the planet s bow shock and subsequently observed the Venusian magnetosheath. The FIELDS instrument suite onboard the spacecraft achieved magnetic and electric field measurements of magnetic hole structures. The electric fields associated with magnetic depressions are consistent with electron current vortices with amplitudes on the order of 1 &mu;A/m<SUP>2</SUP>.
Year of Publication
2021
Journal
Geophysical Research Letters
Volume
48
Number of Pages
e90329
Date Published
03/2021
ISSN Number
0094-8276
URL
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2020GL090329
DOI
10.1029/2020GL090329