Vortex Structure in the Plasma Flow Channels of the Venus Wake

Pérez‐de‐Tejada, H.; Lundin, R.; Intriligator, D. S.

doi:10.5772/66762

Cited by 2 publications

(3 citation statements)

References 12 publications

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“…Data are averaged in 1000 × 1000 km columns at X < −1.5 R V (adapted from Figure 4 of [2]). (Right panel) Average direction of solar wind ion velocity vectors across the Venus near wake collected from many VEX orbits and projected in cylindrical coordinates [7]. DOI: http://dx.doi.org/10.5772/intechopen.101352 decrease of the local magnetic field convected by the solar wind with distinct changes in the orientation of its components.…”

Section: Introductionmentioning

confidence: 99%

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Vortex Dynamics in the Wake of Planetary Ionospheres

Pérez‐de‐Tejada¹,

Lundin²

2022

Vortex Dynamics - From Physical to Mathematical Aspects

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Measurements conducted with spacecraft around Venus and Mars have shown the presence of vortex structures in their plasma wake. Such features extend across distances of the order of a planetary radius and travel along their wake with a few minutes rotation period. At Venus, they are oriented in the counterclockwise sense when viewed from the wake. Vortex structures have also been reported from measurements conducted by the solar wind-Mars ionospheric boundary. Their position in the Venus wake varies during the solar cycle and becomes located closer to Venus with narrower width values during minimum solar cycle conditions. As a whole there is a tendency for the thickness of the vortex structures to become smaller with the downstream distance from Venus in a configuration similar to that of a corkscrew flow in fluid dynamics and that gradually becomes smaller with increasing distance downstream from an obstacle. It is argued that such process derives from the transport of momentum from vortex structures to motion directed along the Venus wake and that it is driven by the thermal expansion of the solar wind. The implications of that momentum transport are examined to stress an enhancement in the kinetic energy of particles that move along the wake after reducing the rotational kinetic energy of particles streaming in a vortex flow. As a result, the kinetic energy of plasma articles along the Venus wake becomes enhanced by the momentum of the vortex flow, which decreases its size in that direction. Particle fluxes with such properties should be measured with increasing distance downstream from Venus. Similar conditions should also be expected in vortex flows subject to pressure forces that drive them behind an obstacle.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Vortex Dynamics in the Wake of Planetary Ionospheres

Pérez‐de‐Tejada¹,

Lundin²

2022

Vortex Dynamics - From Physical to Mathematical Aspects

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“…It has been noted that the anti-solar directed flow of the plasma particles in the Venus wake is rotated to even become oriented back to Venus. The early measurement of that effect was reported by Pérez-de-Tejada et al [1][2][3] from the PVO plasma data and that gave place to conditions that could be assessed as resulting from a vortex structure. Further information on the observation of vortex structures in the Venus wake was reported by Lundin et al [4,5] from measurements conducted with the ASPERA instrument onboard VEX.…”

Section: Introductionmentioning

confidence: 99%

Solar Cycle Variations in the Position of Vortex Structures in the Venus Wake

Pérez‐de‐Tejada¹,

Lundin²

2021

Solar System Planets and Exoplanets

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Measurements conducted with the Venus Express (VEX) spacecraft at its entry and exit through vortex structures in the Venus wake reveal that their position varies with the solar cycle. Both crossings are consistently measured closer to Venus during minimum solar cycle conditions and are gradually encountered at larger distances downstream from the planet along the solar cycle. At the same time their width along the VEX trajectory on the plane transverse to the solar wind direction is larger during minimum solar cycle conditions and show a gradual decrease along the solar cycle. As a result the vortex structures are envisioned as features that gradually become thinner as they extend along the Venus wake and agree with the geometry of a vortex flow in fluid dynamics whose thickness decreases with the downstream distance from an obstacle. Similar conditions should also be applicable to Mars and other bodies within the solar system and also possibly to exo-planets in external stellar systems.

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Vortex Structure in the Plasma Flow Channels of the Venus Wake

Cited by 2 publications

References 12 publications

Vortex Dynamics in the Wake of Planetary Ionospheres

Vortex Dynamics in the Wake of Planetary Ionospheres

Solar Cycle Variations in the Position of Vortex Structures in the Venus Wake

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