Chorus functional dependencies derived from CRRES data


  • M. Spasojevic,

    Corresponding author
    1. Department of Electrical Engineering, Stanford University, Stanford, California, USA
    • Corresponding author: M. Spasojevic, Department of Electrical Engineering, Stanford University, 350 Serra Mall, Packard Bldg. Rm. 321, Stanford, CA 94305-9515, USA. (

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  • Y. Y. Shprits

    1. Skolkovo Institute of Science and Technology, Moscow, Russia
    2. Earth and Space Sciences, UCLA, Los Angeles, California, USA
    3. Department of Earth, Atmospheric, and Planetary Sciences, MIT, Cambridge, Massachusetts, USA
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  • This article was corrected on 23 SEP 2014. See the end of the full text for details.


[1] Using data from the Combined Release and Radiation Effects Satellite (CRRES) plasma wave experiment, we present quadratic fits to the mean of the wave amplitude squared, math formula, for lower and upper band chorus as a function of geomagnetic activity (Kp) and magnetic latitude (λ) for the midnight (21<MLT≤3), dawn (3<MLT≤9), and postnoon (12<MLT≤15) sectors and present an ad hoc model for the prenoon (9<MLT≤12) sector. The empirical models are valid for 4≤L≤7, |λ|<15° and Kp≤6 and quantify the dramatic difference in the latitudinal dependence of chorus as a function of local time and how that dependence varies with geomagnetic condition, critical parameters for calculating wave-induced electron scattering rates. Our results are generally consistent with previous studies, and our key contribution is the quantification of wave properties in a manner that is easily incorporated into global quasi-linear diffusion models.