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@misc{Blanco-Cano:2023:10.5194/egusphere-egu23-9785,
author = {Blanco-Cano, X and Trotta, D and Hietala, H and Kajdic, P and Rojas-Castillo, D and Dimmock, A and Horbury, T and Vainio, R and Jian, L},
doi = {10.5194/egusphere-egu23-9785},
title = {Waves upstream of interplanetary shocks},
type = {Other},
url = {http://dx.doi.org/10.5194/egusphere-egu23-9785},
year = {2023}
}

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TY  - GEN
AB  - <jats:p>Interplanetary (IP) shocks can be driven in the solar wind by fast coronal mass ejections and by the interaction of fast solar wind with slow streams of plasma. These shocks can be preceded by extended waves and suprathermal ion foreshocks. Shocks characteristics as well as the level of wave activity near them change as they propagate through the heliosphere and this can impact particle acceleration, and modify the ambient solar wind. In this work we study IP shock evolution and the wave modes upstream of them using a multispacecraft approach with data of Solar Orbiter, STEREO, Parker Solar Probe and Wind. We find that upstream regions can be permeated by whistler waves (f ~ 1 Hz) and/or ultra low frequency (ULF) right-handed waves (f~10-2&#8211;10-1 Hz). While whistlers appear to be generated at the shock, the origin of ULF waves is most probably associated with local kinetic ion instabilities. In contrast with planetary bow shocks, most IP shocks have a small Mach number (<4) and most of the upstream waves studied here are mainly transverse and steepening rarely occurs.&#160;</jats:p>
AU  - Blanco-Cano,X
AU  - Trotta,D
AU  - Hietala,H
AU  - Kajdic,P
AU  - Rojas-Castillo,D
AU  - Dimmock,A
AU  - Horbury,T
AU  - Vainio,R
AU  - Jian,L
DO  - 10.5194/egusphere-egu23-9785
PY  - 2023///
TI  - Waves upstream of interplanetary shocks
UR  - http://dx.doi.org/10.5194/egusphere-egu23-9785
ER  -

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