Power law burst and inter-burst interval distributions in the solar wind: turbulence or dissipative SOC ?

Details Power law burst and inter-burst interval distributions in the solar wind: turbulence or dissipative SOC ? Power law burst and inter-burst interval distributions in the solar wind: turbulence or dissipative SOC ?

2000-03-08

arxiv.org/abs/astro-ph/0003114v3

Phys. Rev. E62, 8794-8797 (2000)

Astronomy and Astrophysics

Astrophysics

3 pages, 1 figure. Submitted to PRL on 25th February 2000. Revised version re-submitted on 9th May 2000. Second revised versio

Scientific paper

10.1103/PhysRevE.62.8794

We calculate for the first time the probability density functions (PDFs) P of burst energy e, duration T and inter-burst interval tau for a known turbulent system in nature. Bursts in the earth-sun component of the Poynting flux at 1 AU in the solar wind were measured using the MFI and SWE experiments on the NASA WIND spacecraft. We find P(e) and P(T) to be power laws, consistent with self-organised criticality (SOC). We find also a power law form for P(tau) that distinguishes this turbulent cascade from the exponential P(tau) of ideal SOC, but not from some other SOC-like sandpile models. We discuss the implications for the relation between SOC and turbulence.

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