Ion-driven Instabilities in the Inner Heliosphere. I. Statistical Trends
Ion-driven Instabilities in the Inner Heliosphere. I. Statistical Trends
复制标题
内日光层中离子驱动的不稳定性。
DOI:
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发表时间:
2021
影响因子:
4.9
通讯作者:
B. Alterman
中科院分区:
文献类型:
--
作者:
M. Martinović;K. Klein;T. Ďurovcová;B. Alterman
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 ∼1.5M proton and α particle Velocity Distribution Functions (VDFs) observed by Helios I and 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 nonnegligible 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.
DOI:
10.3847/2041-8213/ab4adc
发表时间:
2019-05
期刊:
The Astrophysical Journal Letters
影响因子:
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作者:
Lloyd D. Woodham;R. Wicks;D. Verscharen;C. Owen;B. Maruca;B. Alterman
通讯作者:
Lloyd D. Woodham;R. Wicks;D. Verscharen;C. Owen;B. Maruca;B. Alterman
影响因子:
6.5
作者:
D. Stansby;D. Perrone;L. Matteini;T. Horbury;C. Salem
通讯作者:
D. Stansby;D. Perrone;L. Matteini;T. Horbury;C. Salem
DOI:
10.3847/1538-4357/abd7a0
发表时间:
2021-01
期刊:
The Astrophysical Journal
影响因子:
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作者:
K. Klein;J. Verniero;B. Alterman;S. Bale;A. Case;J. Kasper;K. Korreck;D. Larson;E. Lichko;R. Livi;M. McManus;M. Martinović;A. Rahmati;M. Stevens;P. Whittlesey
通讯作者:
K. Klein;J. Verniero;B. Alterman;S. Bale;A. Case;J. Kasper;K. Korreck;D. Larson;E. Lichko;R. Livi;M. McManus;M. Martinović;A. Rahmati;M. Stevens;P. Whittlesey