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Triggered Ion-acoustic Waves in the Solar Wind

AuthorMozer, F.~S.; Vasko, I.~Y.; Verniero, J.~L.;
KeywordsSolar Coronal Waves; Solar wind; 1995; 1534; Physics - Space Physics; Astrophysics - Solar and Stellar Astrophysics; Physics - Plasma Physics; Parker Data Used
AbstractFor more than 12 hr beginning on 2021 January 18, continuous narrowband electrostatic emissions were observed on the Parker Solar Probe near 20 solar radii. The observed <1000 Hz frequencies were well below the local ion-plasma frequency. Surprisingly, the emissions consisted of electrostatic wave packets with shock- like envelopes, appearing repetitively at a \raisebox-0.5ex\textasciitilde1.5 Hz rate. This repetitiveness correlated and was in phase with low-frequency electromagnetic fluctuations. The emissions were associated with simultaneously observed ion beams and conditions favorable for ion-acoustic wave excitation, i.e., Te/Ti \raisebox-0.5ex\textasciitilde 5. Based on this information and on their velocity estimates of about 100 km s$^-1$, these electrostatic emissions are interpreted as ion-acoustic waves. Their observation demonstrates a new regime of instability and evolution of oblique ion-acoustic waves that have not been reported previously in theory or experiment.
Year of Publication2021
Number of PagesL2
Date Publishedsep