Testing of the backward wave oscillator model by using the spectral characteristics of VLF chorus elements

Титова, Е. Е.; Kozelov, B. V.; Демехов, А. Г.; Santolı́k, O.; Macúšová, E.; Rauch, Jean-Louis; Trotignon, J. G.; Gurnett, D. A.; Pickett, J. S.

doi:10.1109/ursigass.2011.6051150

Cited by 1 publication

(1 citation statement)

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“…For example, using α = 72° brings the average agreement between the fitted value of Γ H and Γ OB within ∼3%. Similarly, the value of Q in the BWO model used above ( Q = 2) might also be underestimated; e.g., Titova et al [2011] suggested that, on average, Q ≈ 8 for lower band chorus calculated using observational frequency sweep rates. However, the exact value of α or Q should be determined through more rigorous numerical simulations and observed distribution functions.…”

Section: Comparison Between Theory and Observationmentioning

confidence: 99%

Comparison between theory and observation of the frequency sweep rates of equatorial rising tone chorus

Tao

Bortnik

et al. 2012

Geophysical Research Letters

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[1] Theoretical predictions for chorus frequency sweep rates by Helliwell and Trakhtengerts are compared with observations from the THEMIS satellites and a previously published dataset from the Cluster satellites. We first extend the theories to use a general magnetic field model to include the effects of magnetic local time and geomagnetic activity, and then show that both theories give the same dependence of the frequency sweep rate on background plasma parameters. The theoretical scaling of frequency sweep rates are shown to agree very well with observations. We demonstrate that for a given equatorial magnetic field strength, nightside and dawnside chorus waves have higher frequency sweep rates because of the stretching of the magnetic field, while dayside chorus waves have lower frequency sweep rates because of the compression of the field. Increasing geomagnetic activity will enhance the asymmetry by increasing the day-night asymmetry of the background field. The results are important for understanding the generation mechanism of chorus waves. Citation: Tao, X., W. Li, J. Bortnik, R. M. Thorne, and V. Angelopoulos (2012), Comparison between theory and observation of the frequency sweep rates of equatorial rising tone chorus, Geophys. Res. Lett., 39, L08106,

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Section: Comparison Between Theory and Observationmentioning

confidence: 99%