Hemispheric asymmetry of the magnetic field wrapping pattern in the Venusian magnetotail

TL Zhang, W Baumjohann, J Du… - Geophysical …, 2010 - Wiley Online Library
Geophysical Research Letters, 2010Wiley Online Library
We examine statistically the magnetic field in the Venusian magnetotail which is formed by
the draping of interplanetary magnetic field lines. Although the near‐planet and distant
magnetotail regions have been sampled by the various missions to Venus and the general
magnetic features of the distant magnetotail are well established, the near wake region from
about 1.3 to 3 Venusian radii downstream of the planet remained unexplored until the Venus
Express mission. Here we report the unanticipated finding of a draped field reversal in one …
We examine statistically the magnetic field in the Venusian magnetotail which is formed by the draping of interplanetary magnetic field lines. Although the near‐planet and distant magnetotail regions have been sampled by the various missions to Venus and the general magnetic features of the distant magnetotail are well established, the near wake region from about 1.3 to 3 Venusian radii downstream of the planet remained unexplored until the Venus Express mission. Here we report the unanticipated finding of a draped field reversal in one hemisphere of the near Venus tail. When ordered by the interplanetary electric field orientation, the magnetic field lines in the hemisphere with inward motional electric field apparently are wrapped more tightly around Venus than in the other hemisphere, thus forming a field reversal region in the this portion of the near tail. A global hybrid simulation produces what we see and provides a three‐dimensional view of the observed hemispherical asymmetry.
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