Conference proceeding
Inhomogeneous Distribution of High-Amplitude Kinetic Alfvén Waves in the Near-Sun Solar Wind
Vol.2022
AGU Fall Meeting 2022
2022
Abstract
The near-Sun solar wind (sunward of 0.25 AU) is found to contain many intervals of high-amplitude electromagnetic broadband plasma waves. These waves are identified as kinetic Alfvén waves (KAWs) based on variation in their electric to magnetic field ratio and magnetic compressibility as a function of frequency. A key difference between these KAWs and KAWs observed near 1 AU is that the near-Sun high-amplitude KAWs are distributed unevenly in space, most often occurring where the ambient magnetic field deviates from the Parker spiral direction, including during magnetic switchbacks. Because small-scale turbulent fluctuations in the solar wind are often characterized as KAWs, these observations suggest that turbulent dissipation and heating via KAW fluctuations should also be spatially inhomogeneous in the near-Sun solar wind, maximizing in regions of high-amplitude KAWs. Also, a deviation between the observed KAWs and theoretical KAW behavior is observed at the smallest fluctuation scales. Possible origins of this deviation are explored.
Details
- Title: Subtitle
- Inhomogeneous Distribution of High-Amplitude Kinetic Alfvén Waves in the Near-Sun Solar Wind
- Creators
- David MalaspinaAlexandros ChasapisPeter TatumChadi S. SalemStuart D. BaleJohn W. BonnellThierry Dudok de Wit - Laboratoire de Physique et Chimie de l'Environnement et de l'EspaceKeith GoetzMarc PulupaJasper S. HalekasPhyllis L. WhittleseyRoberto LiviAnthony W. CaseMichael Louis StevensDavin E. Larson
- Resource Type
- Conference proceeding
- Publication Details
- Vol.2022
- Conference
- AGU Fall Meeting 2022
- Language
- English
- Date published
- 2022
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984464482602771
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