G
I
Last name: GONÇALVES
First name: Ivan
International audience
Measuring the atmospheric circulation of Venus at different altitudes is important for understanding its complex dynamics, in particular the mechanisms driving super-rotation. Observationally, Doppler imaging spectroscopy is in principle the most reliable way to measure wind speeds of planetary atmospheres because it directly provides the...
The JOVIAL instrument is a Doppler imager, dedicated to the study of atmospheric dynamics at the surface of the planets of the Solar System, and in particle Jupiter and Saturn. The principle of this instrument is fully described in several papers presented at previous SPIE meetings 1-4 (Gonçalves et al, 2016; Soulat et al, 2017; Underwood et...
The measurements of radial velocity fields on planets with a Doppler Spectro-Imager allow the study of atmospheric dynamics of giant planets and the detection of their acoustic oscillations. The frequencies of these oscillations lead to the determination of the internal structure by asteroseismology. A new imaging tachometer, based on a...
We present velocity maps of Jupiter obtained from the ground with a dedicated Doppler imaging spectrograph. It demonstrates the potential of this method to study the motion in the atmosphere of gaseous planets. It proves to be complementary to cloud-tracking to understand the atmospheric dynamics
We present the first measurements of Jupiter's wind profile obtained from radial-velocity measurements. Radial velocity measurements of wind are rather difficult, but can be very interesting as they measure the actual speed of cloud particles instead of the motion of large cloud structures. Here we present the first scientific results of the...
We present the first measurements of Jupiter's wind profile ever obtained with Doppler velocity measurements in the visible. Hitherto, knowledge about atmospheric dynamics has been obtained with cloud-tracking techniques , which consist of tracking visible features from images taken at different dates. However, cloud tracking indicates the...
The installation and operation of a telescope in Antarctica represent particular challenges, in particular the requirement to operate at extremely cold temperatures, to cope with rapid temperature fluctuations and to prevent frosting. Heating of electronic subsystems is a necessity, but solutions must be found to avoid the turbulence induced by...