A detailed analysis of ion-acoustic waves observed in the solar wind by the Solar Orbiter
- 1Inst Atmospher Phys, Czech Acad Sci, Prague 4, Czechia (dp@ufa.cas.cz)
- 2Faculty of Mathematics and Physics, Charles University, V Holesovickach 2, 18000 Prague 8, Czechia
- 3LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92195 Meudon, France
- 4LPP, CNRS, Ecole Polytechnique, Sorbonne Université, Observatoire de Paris, Université Paris-Saclay, Palaiseau, Paris, France
- 5Swedish Institute of Space Physics (IRF), Uppsala, Sweden
- 6LPC2E, CNRS, 3A avenue de la Recherche Scientifique, Orléans, France
- 7Université d’Orléans, Orléans, France
- 8Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT, UK
- 9Institut de Recherche en Astrophysique et Planétologie, 9 avenue du Colonel Roche, BP 4346, 31028 Toulouse Cedex 4, France
Ion-acoustic waves are often observed in the solar wind along the Solar Orbiter’s orbit. These electrostatic waves are generated via ion-ion or current-driven instabilities below the local proton plasma frequency. Due to the Doppler shift, they are typically observed in the frequency range between the local electron and proton plasma frequency in the spacecraft frame. Ion-acoustic waves often accompany large-scale solar wind structures and play a role in the energy dissipation in the propagating solar wind. Time Domain Sampler (TDS) receiver, a part of the Radio and Plasma Waves (RPW) instrument, is sampling wave emissions at frequencies below 200 kHz almost continuously from the beginning of the mission. Almost three years of observations allow us to perform a detailed study of ion-acoustic waves in the solar wind under variable plasma conditions. The emission tends to be observed when proton density and temperature are highly perturbed. A detailed analysis of the proton velocity distribution and wave generation using solar wind data from a Proton and Alpha particle Sensor (PAS) of the Solar Wind Analyzer (SWA) is shown.
How to cite: Pisa, D., Soucek, J., Santolik, O., Formanek, T., Maksimovic, M., Chust, T., Khotyaintsev, Y., Kretzschmar, M., Owen, C., Louarn, P., and Fedorov, A.: A detailed analysis of ion-acoustic waves observed in the solar wind by the Solar Orbiter, EGU General Assembly 2023, Vienna, Austria, 24–28 Apr 2023, EGU23-6538, https://doi.org/10.5194/egusphere-egu23-6538, 2023.
