Magnetic field power spectra and magnetic radial diffusion coefficients using CRRES magnetometer data

TitleMagnetic field power spectra and magnetic radial diffusion coefficients using CRRES magnetometer data
Publication TypeJournal Article
Year of Publication2015
AuthorsAli, AF, Elkington, SR, Tu, W, Ozeke, LG, Chan, AA, Friedel, RHW
JournalJournal of Geophysical Research: Space Physics
Date Published02/2015
KeywordsCRRES; diffusion coefficients; radial diffusion; ULF waves
AbstractWe used the fluxgate magnetometer data from Combined Release and Radiation Effects Satellite (CRRES) to estimate the power spectral density (PSD) of the compressional component of the geomagnetic field in the ∼1 mHz to ∼8 mHz range. We conclude that magnetic wave power is generally higher in the noon sector for quiet times with no significant difference between the dawn, dusk, and the midnight sectors. However, during high Kp activity, the noon sector is not necessarily dominant anymore. The magnetic PSDs have a very distinct dependence on Kp. In addition, the PSDs appear to have a weak dependence on McIlwain parameter L with power slightly increasing as L increases. The magnetic wave PSDs are used along with the Fei et al. (2006) formulation to compute inline image as a function of L and Kp. The L dependence of inline image is systematically studied and is shown to depend on Kp. More significantly, we conclude that inline imageis the dominant term driving radial diffusion, typically exceeding inline image by 1–2 orders of magnitude.
URLhttp://doi.wiley.com/10.1002/2014JA020419
DOI10.1002/2014JA020419
Short TitleJ. Geophys. Res. Space Physics


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