Evidence for a single stochastic physical process for fast solar wind magnetic field magnitude fluctuations at 1AU across `turbulent' and `1/f' temporal scales

Details Evidence for a single stochastic physical process for fast solar wind magnetic field magnitude fluctuations at 1AU across `turbulent' and `1/f' temporal scales Evidence for a single stochastic physical process for fast solar wind magnetic field magnitude fluctuations at 1AU across `turbulent' and `1/f' temporal scales

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh53a..08h&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH53A-08

Physics

Plasma Physics

[2149] Interplanetary Physics / Mhd Waves And Turbulence, [2164] Interplanetary Physics / Solar Wind Plasma, [3270] Mathematical Geophysics / Time Series Analysis, [7857] Space Plasma Physics / Stochastic Phenomena

Scientific paper

The power spectral density of magnetic field components in the fast solar wind on magnetohydrodynamic scales typically shows two power law regions, identified with an inertial range of turbulence, and at lower frequencies, a ~1/f range of coronal origin. The power spectral density of field magnitude shows a single power law region across these scales. We present the first scale-by-scale quantitative comparison of the averaged statistical properties of magnetic field magnitude and component fluctuations over timescales of ~2 minutes to 5.6 hours observed in-situ in the fast quiet solar wind at solar minimum at 1AU with the ACE spacecraft. Fluctuations in the field components show an 'inertial range' of scaling up to ~30 minutes and beyond this, uncorrelated Gaussian statistics. In contrast, the magnetic field magnitude fluctuations show a single scaling behaviour up to 5 hours and are non-Gaussian over this entire range of scales. Thus unlike for the components, a single stochastic process could account for the fluctuations in field magnitude over both the inertial range and 1/f range of timescales the fast solar wind.

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