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- Title
Observations of co-existing rising and falling tone emissions of electromagnetic ion cyclotron waves.
- Authors
Ojha, Biswajit; Omura, Yoshiharu; Singh, Satyavir; Lakhina, Gurbax S.
- Abstract
We report observations of co-existing rising and falling tone emissions of electromagnetic ion cyclotron (EMIC) waves by THEMIS E spacecraft. The investigation of these fine structures of the EMIC waves is essential from the point of view of understanding the connection between the proton holes and the proton hills in velocity phase-space. The wave packets of rising and falling tones are tracked by Poynting vector analysis, where we observe that the rising tones are propagating northward and the falling tones are propagating southward. The nonlinear wave growth theory supports our observations. We propose a model where the proton velocity distribution function evolves through the formation of proton holes on the negative side of the distribution function and mirrored resonant protons forming proton hills on the positive side of the distribution function, allowing us to observe the co-existing rising and falling tone EMIC waves.
- Subjects
ION acoustic waves; ION emission; DISTRIBUTION (Probability theory); WAVE packets; POYNTING theorem; NONLINEAR waves; CYCLOTRONS
- Publication
Earth, Planets & Space, 2024, Vol 76, Issue 1, p1
- ISSN
1343-8832
- Publication type
Article
- DOI
10.1186/s40623-024-02027-2