Evidence for a 'background' spectrum of solar wind turbulence in the inner heliosphere

Details Evidence for a 'background' spectrum of solar wind turbulence in the inner heliosphere Evidence for a 'background' spectrum of solar wind turbulence in the inner heliosphere

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.4337t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, April 1, 1990, p. 4337-4341.

Physics

60

Heliosphere, Plasma Turbulence, Power Spectra, Satellite Observation, Solar Wind, Interplanetary Magnetic Fields, Statistical Analysis

Scientific paper

A statistical analysis is presented of the power spectra of the fluctuating Elsaesser variables which covers 3408 hrs of interplanetary magnetic field and plasma observations made aboard the Helios 1 and 2 spacecraft. The variation of the average e(+,-) spectra with heliocentric distance, solar wind velocity, and solar cycle phase is studied. It is shown that the spectrum of e(-) in the low-frequency range exhibits little variation with stream structure, heliocentric distance, and solar activity. As a result, the decrease of cross-helicity with increasing heliocentric distance is probably mainly due to the observed decrease of e(+).

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