Encontrados 7 documentos, a visualizar página 1 de 1
Solar Migrating Atmospheric Tides in the Winds of the Polar Region of Venus
Peralta, Javier; Luz, David; Berry, David; Tsang, Constantine; Sánchez-Lavega, Agustín; Huelso, Ricardo; Piccioni, Giuseppe; Drossart, PierreWe study the effects of migrating solar tides on the winds at the cloud tops of the polar region of Venus. The winds were measured using cloud tracking on images obtained at wavelengths of 3.9 and 5.0 μm by the instrument VIRTIS-M onboard Venus Express. These wavelengths probe about the same altitude close to the cloud tops, allowing for the first time to retrieve winds simultaneously in the day and nightside o...
Characterization of Atmospheric Waves at the Upper Clouds in the Polar Region o...
Peralta, Javier; Luz, David; Berry, David; Tsang, Constantine; Migliorini, Alessandra; Piccioni, Giuseppe; Drossart, PierreNon solar-fixed waves at the cloud tops of the southern polar region of Venus are studied in the winds measured with 3.9 and 5.0 μm images taken by the instrument VIRTIS-M onboard Venus Express. Wavenumbers 1, 2 and 3 are detected, with wave amplitudes ranging from 3.6 to 8.0 m/s. The evolution of the phase has been studied in 16 orbits, finding in a subset of orbits wavenumbers 1 and 2 propagating in different...
New Measurements of Venus Winds with Ground-Based Doppler Velocimetry at CFHT
Machado, Pedro; Widemann, Thomas; Luz, David; Peralta, Javier; Berry, Davidoperations with observations from the ground using various techniques and spectral domains (Lellouch and Witasse, 2008). We present an analysis of Venus Doppler winds at cloud tops based on observations made at the Canada France Hawaii 3.6-m telescope (CFHT) with the ESPaDOnS visible spectrograph. These observations consisted of high-resolution spectra of Fraunhofer lines in the visible range (0.37-1.05 μm) to ...
Dynamics of Venus’ southern polar vortex from over two years of VIRTIS/Venus Ex...
Luz, David; Berry, David; Peralta, Javier; Piccioni, GiuseppeRecently, the results of an initial study of the southern polar region of Venus, using measurements from the VIRTIS instrument from the Venus Express Mission, revealed it to be in constant dynamic change, with the southern polar vortex displaced from the rotational geometry of the planet. Here, we place these results in the context of measurements taken over a two year period. We examine the dynamics of the sou...
Solar Tides in the winds of the southern polar region of Venus using VIRTIS-M/V...
Peralta, Javier; Luz, David; Berry, David; Piccioni, Giuseppe; Drossart, Pierre; Hueso, Ricardo; Sánchez-Lavega, AgustinThe effect of the solar tides on the winds at the top of the clouds in Venus has been studied using cloud tracking technique applied to the Venus Express/VIRTIS-M images taken at wavelengths of 3.8 and 5.0 μm. Both these wavelengths probe about the same altitude on the clouds top, allowing for the first time to retrieve winds in the dayside and nightside simultaneously. The dataset included observations from 17...
Winds and cloud morphology in the southern polar region of Venus
Luz, David; Berry, David L.; Peralta, Javier; Piccioni, Giuseppe; Drossart, Pierre; VIRTIS-Venus Express TeamSpinning on average 60 times faster than the surface, the atmosphere of Venus is superrotational, a state in which the averaged angular momentum is much greater than that corresponding to co-rotation with the solid globe. The rapid mean flow, which is main- tained by momentum transports in the deep atmo- sphere, presents a puzzle to the atmospheric and plan- etary sciences[1]. After previous missions revealed a...
South polar dynamics of the Venusian atmosphere from VIRTIS/Venus Express mappi...
Luz, David; Berry, David L.; Peralta, Javier; Drossart, Pierre; Piccioni, GiuseppeWe report on measurements of Venus cloud velocities from VIRTIS/Venus Express observations of the south polar region of Venus. Cloud tracking has been performed using a method of automated digital correlation. Tracking has been performed on pairs of monochromatic VIRTIS images selected mainly in the 5 μm window, but also at 1.74, 2.3, 3.93 micrometers. Wind measurements from vector retrievals based on automated...
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