Institut national de recherche scientifique français Univerité Pierre et Marie Curie Université Paris Diderot - Paris 7

Density turbulence in the solar wind using low-frequency angular broadening observations

vendredi 11 janvier 2019, par K. Sasikumar Raja (LESIA)

Mardi 15 janvier 2019 à 11h00 , Lieu : Salle de rĂ©union du bâtiment Jean-Louis Steinberg (bât. 16)

Various types of remote sensing observations have been used so far to probe the weakly compressible density turbulence in the extended solar corona and solar wind. Using the angular broadening observations of radio celestial point like sources, we have studied various turbulent parameters in the solar wind : anisotropic broadening, amplitude of density turbulence, density fluctuations, proton heating rate and the dissipation scales. For this study, we used the observations of Gauribidanur radioheliograph, Very Large Array and other historical observations carried out during 1952-2017. In this talk, I will discuss, the way these parameters vary with heliocentric distance and the solar cycle. The newly launched Parker Solar Probe and upcoming Solar Orbiter missions are going to play a crucial role in addressing these issues and other long standing mysteries of the solar wind.