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Evidence of Langmuir/﹩{ \mathcal Z }﹩-mode Wave Decay into ﹩{ \mathcal Z }﹩-mode Electromagnetic Radiation in the Solar Wind

  • Authors: F. J. Polanco-Rodríguez, C. Krafft, P. Savoini

F. J. Polanco-Rodríguez et al 2026 The Astrophysical Journal Letters 1002 .

  • Provider: AAS Journals

Caption: Figure 1.

Snapshot captured in the survey mode by the Solar Orbiter instrument RPW, on 2022 September 22, at 13:52:28 UT. (a) Waveform of the two electric field components Ez (blue) and Ey (red), in the SRF frame. (b) Hodograms Ey(Ez) calculated within equidistant time windows of 0.7 ms. (c)–(d) Wavelet spectrograms of the electric energy ∣E(ft)∣2 = ∣Ey(ft)∣2 + ∣Ez(ft)∣2 in the high- and low-frequency ranges, i.e., 45 ≤ f ≤ 48 kHz and f ≤ 1 kHz, respectively. (e) Wavelet spectrogram of the magnetic energy ∣B(ft)∣2, in the same frequency range as (c). (c)–(e) The color bars are in logarithmic scales. (f)–(i) Power spectra of the field components Ez (blue), Ey (red), and cB (green), respectively. Zoomed-in views are presented, in logarithmic and linear scales, in the ranges of 44 ≤ f ≤ 48 kHz ((g), (h)) and f ≤ 1 kHz (i). The black curve in (i) represents the spectrum of ∣E2. The dashed vertical lines correspond to peaks at f3 ≃ 45.74 kHz and f1 ≃ 46.04 kHz (g)–(h), and at ﹩{f}_{1}^{{\prime} }\simeq 0.3﹩ kHz (i). Spectra in (f)–(i) are calculated in the time interval of 2 ≤ t ≤ 22 ms.

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