Unusual nonlinear waves in the Venusian magnetosheath

Details Unusual nonlinear waves in the Venusian magnetosheath Unusual nonlinear waves in the Venusian magnetosheath

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11601215w&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A1, CiteID A01215

Astronomy and Astrophysics

Astrophysics

1

Planetary Sciences: Comets And Small Bodies: Interactions With Solar Wind Plasma And Fields, Solar Physics, Astrophysics, And Astronomy: Magnetic Fields, Planetary Sciences: Comets And Small Bodies: Magnetic Fields And Magnetism, Planetary Sciences: Solar System Objects: Venus

Scientific paper

Within the Venusian magnetosheath, Venus Express has observed the existence of high-amplitude, nonlinear waves which have been interpreted as large-scale nonlinear rotational structures within the magnetic field. A number of mechanisms have been proposed that can be used to explain their origin. Venus Express data have been searched for other examples of the similar structures. It appears that such structures are quite rare, being observed during only 8 of the dayside magnetosheath crossings among 676 that took place between April 2006 and February 2008. All together, only 50 such waves have been identified during these 8 crossings. The properties of these structures were studied. After considering a number of possible generation mechanisms, it is concluded that the most probable generation mechanism is the Kelvin-Helmholtz Instability; however, other mechanisms such as shock-related processes cannot be completely discounted.

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