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- W3207838497 abstract "Instabilities described by linear theory characterize an important form of wave-particle interaction in the solar wind. We diagnose unstable behavior of solar wind plasma between 0.3 and 1 au via the Nyquist criterion, applying it to fits of $sim1.5$M proton and $alpha$ particle Velocity Distribution Functions (VDFs) observed by emph{Helios I} and emph{II}. The variation of the fraction of unstable intervals with radial distance from the Sun is linear, signaling a gradual decline in the activity of unstable modes. When calculated as functions of the solar wind velocity and Coulomb number, we obtain more extreme, exponential trends in the regions where collisions appear to have a notable influence on the VDF. Instability growth rates demonstrate similar behavior, and significantly decrease with Coulomb number. We find that, for a non-negligible fraction of observations, the proton beam or secondary component might not be detected due to instrument resolution limitations, and demonstrate that the impact of this issue does not affect the main conclusions of this work." @default.
- W3207838497 created "2021-10-25" @default.
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- W3207838497 date "2021-12-01" @default.
- W3207838497 modified "2023-10-06" @default.
- W3207838497 title "Ion-driven Instabilities in the Inner Heliosphere. I. Statistical Trends" @default.
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- W3207838497 doi "https://doi.org/10.3847/1538-4357/ac3081" @default.
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