First Attempt To Retrieve A Mars Atmospheric Wind Map From
Earth, Using Vlt/Uves During The 2018 Global Dust Storm.
P. Machado [1,2], H. Valido [1, 2], G. Gilli [3,1], A. Cardesin-Moinelo [4,1], F. Brasil [1,2], J. E. Silva [1,2],
[1] Instituto De Astrofisica E Ciencias Do Espaco, Lisbon, Portugal (Machado@Oal.Ul.Pt), [2] Faculdade De Ciencias
Da Universidade De Lisboa, Lisbon, Portugal, [3] Instituto De Astrofisica De Andalucia (Iaa-Csic), Granada, Spain,
[4] European Space Astronomy Centre, Spain.

Abstract
This Work Presents Ground-Based Wind Velocity Measurements Of Mars During The 2018 Global Dust Storm
Using Doppler Velocimetry Techniques Based On Observations Made With The Ultraviolet And Visual Echelle
Spectrograph (Uves) At The European Southern Observatory’S Very Large Telescope (Vlt) Facility In Chile.
This Instrument’S High Resolution ( R ∼100 000) Allows
For The Dust Cloud Velocity To Be Measured, By Computing The Doppler Shift Induced In The Fraunhofer Lines
(In The Λ Of 420-1100 Nm) In The Solar Radiation That Is
Backscattered In The Dust Suspended In The Martian Atmosphere, By The Motion Of That Same Dust, With An Average
Error Of Approximately 5 Ms−1 . This Allows Us To Sound
Mars’ Middle Atmosphere During A Global Dust Storm And
Obtain Latitudinal Wind Profiles And A First Approach Of A
Planetary Wind Map At The Altitude Level Sounded, I.E. The
Altitude Level Where The Optical Depth Reaches The Unity.