Generation Mechanism of Oxygen Ion Cyclotron Harmonic Waves in the Inner Magnetosphere: Linear Instability Analysis Based on Observations
Year: 2024
Type: article
Abstract: Linear kinetic instability analysis based on in situ observations for one typical oxygen ion cyclotron harmonic (OCH) wave event is performed to investigate the wave excitation mechanism. The observed partial‐shell velocity distribution of energetic O+s is fitted by the superposition of multiple ring‐beam distributions. The calculated linear growth rate shows that the observed OCH waves can be excited by energetic O+s with the partial‐shell velocity distribution, and the maximum growth rate occurs at the third harmonic, coinciding with the frequency associated with the maximum peak of the wave electric field power spectral density measured. In addition, it is found that cool heavy ions have a damping effect on the OCH waves near the corresponding heavy ion cyclotron frequency.
Source: Geophysical Research Letters
DOI: 10.1029/2024gl112168
Authors: Yan Wang, Kaijun Liu, Kun Cheng, Ameneh Mousavi, Fei Yao, Xinye Wang, Ruohan Wang
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,900
Award: G3399925722
OpenAlex ID: W4405577227