PSP Bibliography


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The Evolution of Compressible Solar Wind Turbulence in the Inner Heliosphere: PSP, THEMIS, and MAVEN Observations

Authores, Andr\; Sahraoui, F.; Hadid, L.~Z.; Huang, S.~Y.; Romanelli, N.; Galtier, S.; DiBraccio, G.; Halekas, J.;
KeywordsSolar wind; Fast solar wind; Slow solar wind; Interplanetary physics; 1534; 1872; 1873; 827; Physics - Space Physics; Astrophysics - Solar and Stellar Astrophysics; Physics - Plasma Physics; Parker Data Used
AbstractThe first computations of the compressible energy transfer rate from \raisebox-0.5ex\textasciitilde0.2 up to \raisebox-0.5ex\textasciitilde1.7 au is obtained using Parker Solar Probe (PSP), Time History of Events and Macroscale Interactions during Substorms (THEMIS), and Mars Atmosphere and Volatile EvolutioN (MAVEN) observations. Using a recently derived exact relation for isothermal magnetohydrodynamics turbulence, the compressible energy cascade rate, \ensuremath\varepsilon$_C$, is computed for hundred of events at different heliocentric distances, for time intervals when the spacecrafts were in the pristine solar wind. The observational results show moderate increases of \ensuremath\varepsilon$_C$ with respect to the incompressible cascade rate, \ensuremath\varepsilon$_I$. Depending on the level of compressibility in the plasma, which reaches up to 25\% at PSP s perihelion, the different terms in the exact compressible relation are shown to have different impacts on the total cascade rate, \ensuremath\varepsilon$_C$. Finally, the observational results are connected with the local ion temperature and the solar wind heating problem.
Year of Publication2021
Number of Pages19
Date Publishedsep