Abstract Details

Name: Suman Dey
Affiliation: Visva-Bharati University, Santiniketan, West Bengal-731235
Conference ID: ASI2021_110
Title : Effects of streaming instability in leaking O+ and H+ from upper ionosphere of Venus
Authors and Co-Authors : Suman Dey (Department of Physics, Visva-Bharati University, Santiniketan, Bolpur, West Bengal-731235, India), Ayanabha De (Physics Department, Scottish Church College, Kolkata 700006, India), Debjit Maity (Department of Physics, Visva-Bharati University, Santiniketan, Bolpur, West Bengal-731235, India)
Abstract Type : Poster
Abstract Category : Sun and the Solar System
Abstract : It is well established that the Hydrogen and Oxygen ions are leaking from the atmosphere of Venus. The lack of global internal magnetic field of Venus causes the solar wind plasma directly stream into its atmosphere. As a result, higher parts of it’s ionosphere may encounter multi-stream instabilities. Destabilized plasma waves may accelerate the ions to velocities greater than their escape velocity. This can along with many other explanations can be a possible reason for leak of ions from the Venus's atmosphere. We have considered non-magnetized plasma with 3 components – O+, H+, and streaming solar wind electrons, all with suprathermal distributions. We have obtained the dispersion relation and studied the streaming instability and calculated the growth rate of the instability. Then we have used parameter values from VEX (Venus Express) for both dayside and nightside to determine whether or not the instability is enough to accelerate ions to escape velocities and hence leave the atmosphere of Venus.